Fertigationsawv cev rau ib qho ntawm cov kev nce qib tseem ceeb tshaj plaws hauv kev ua liaj ua teb niaj hnub no, sib txuas cov dej thiab fertilization rau hauv ib qho kev xa khoom zoo. Los ntawm kev sib koom ua ke dej- cov chiv ua kua dej ncaj qha rau hauv cov kav dej drips, fertilation ua rau cov neeg ua liaj ua teb xa cov as-ham raws nraim qhov twg cov qoob loo xav tau lawv- ntawm thaj chaw hauv paus- raws nraim thaum lawv xav tau.
Tsis zoo li ib txwm tshaj tawm los yog sab- hnav daim ntawv thov txoj kev, uas feem ntau ua tiav nitrogen siv cov txiaj ntsig ntawm tsuas yog 30-50%, fertigation tuaj yeem txhim kho nitrogen efficiency rau 80-95%. Ib yam li ntawd, kev siv cov poov tshuaj dhia los ntawm 60-70% nrog cov qauv siv rau 85-95% nrog fertigation. Raws li Lub Tsev Haujlwm Saib Xyuas Kev Ua Liaj Ua Teb Punjab thiab University of Arkansas Extension (FSA6160), cov kev ua tau zoo no tau txhais ua cov chiv txo ntawm 25-30% thaum tswj lossis nce yields los ntawm 25-30%.
Cov lus qhia dav dav no suav nrog tag nrho cov kev ua haujlwm fertigation rau kev ua liaj ua teb - teev kev ua haujlwm - los ntawm kev tsim qauv thiab kev xaiv cov khoom los ntawm kev sib xyaw ntawm cov chiv, kev suav tus nqi txhaj tshuaj, thiab qoob loo- kev teem caij tshwj xeeb. Txawm hais tias koj tab tom tswj 10 acres ntawm kev ua txiv lws suav lossis 500 acres ntawm paj rwb, tsab xov xwm no muab lub hauv paus kev koj xav tau los siv lossis ua kom zoo tshaj qhov kev pab cuam fertigation.
Fertigation ua haujlwm los ntawm cov dej soluble- cov chiv soluble nyob rau hauv lub tso tsheb hlau luam thiab txhaj cov tshuaj concentrated no rau hauv cov kav dej ntawm tus nqi tswj. Cov chiv- cov dej ntws tawm tom qab ntawd taug kev los ntawm cov drip network thiab tso ncaj qha rau hauv cov nroj tsuag cov hauv paus active cheeb tsam los ntawm emitters.
Lub hauv paus ncaj qha no- cheeb tsam xa tawm tshem tawm cov khoom noj leaching thiab gaseous poob cuam tshuam nrog daim ntawv thov saum npoo. Thaum koj tshaj tawm urea ntawm cov av qhuav, mus txog 40% tuaj yeem poob rau ammonia volatilization hauv 48 teev. Nrog fertigation, cov khoom noj uas yaj tau txav nrog cov dej hauv av thiab tau nqus los ntawm cov hauv paus hniav ua ntej cov kev poob no tshwm sim.
| Khoom noj khoom haus | Ib txwm siv Efficiency | Fertigation Efficiency | Qhov chaw |
| Nitrogen (N) | 30-50% | 80-95% | UAEX FSA6160, Punjab Agriculture |
| Phosphorus (P) | 10-25% | 80-90% | UAEX FSA 6160 |
| Potassium (K) | 60-70% | 85-95% | Punjab Agriculture HEIS phau ntawv |
| Micronutrients | 5-20% | 80-90% | UF/IFAS |
Qhov kev txhim kho loj heev hauv phosphorus efficiency yog qhov tshwj xeeb. Txij li thaum phosphorus txav qeeb heev hauv av (tsuas yog 1-2 cm los ntawm daim ntawv thov taw tes), daim ntawv thov band ib txwm muab tso rau hauv cov av tsawg. Fertigation dissolves P tag nrho thiab faib nws los ntawm thaj tsam wetted, ua kom nthuav dav hauv paus nkag mus.
Nkag siab txog peb -stage fertigation cycle yog qhov tseem ceeb rau kev ua haujlwm tau zoo. Lub voj voog no rov ua dua nrog txhua qhov kev tshwm sim fertigation thiab yuav tsum tsis txhob raug luv lossis hla:
Theem 1: Ua ntej- Ntub Dej (20-25% ntawm lub sijhawm ua dej)
Pib txhua qhov kev tshwm sim fertigation nrog 20-25% ntawm tag nrho cov irrigation lub sij hawm khiav dej huv xwb. Lub sijhawm no ua tiav peb lub hom phiaj tseem ceeb:
- Tsim kom muaj qhov system siab zoo thoob plaws hauv lub network
- Ua ntej- ntub cov hauv paus cheeb tsam av, tsim kom muaj kev pom zoo rau kev noj zaub mov zoo
- Tiv thaiv "surges nutrient"- qhov nrawm nrawm ntawm cov chiv los ntawm cov av qhuav dhau los ntawm thaj chaw hauv paus
Rau qhov kev tshwm sim 60-feeb dej, khiav 12-15 feeb ntawm dej huv ua ntej pib txhaj tshuaj.
Theem 2: Phaj Txhaj Tshuaj (50-60% ntawm lub sijhawm dej)
Tom qab ua ntej - ntub dej, txhaj cov tshuaj chiv rau tom ntej 50-60% ntawm cov kav dej. Cov kua dej concentrated sib xyaw nrog cov dej hauv dej raws li nws tau kos rau hauv qhov system, tsim kom muaj kev ua haujlwm siab uas ncav cuag cov emitters.
Theem 3: Flush Phase (20-25% ntawm lub sij hawm irrigation)
Tom qab txhaj tshuaj tiav, txuas ntxiv dej huv rau qhov kawg 20-25% ntawm lub sijhawm dej. Qhov no flush theem:
- Clears chiv residue los ntawm mainlines thiab laterals
- Tiv thaiv emitter clogging los ntawm crystallized fertilizer ntsev
- Tiv thaiv cov khoom siv hauv lub cev (valve, fittings, twj) los ntawm corrosion
- Muab cov khoom noj uas tseem tshuav hauv lub cev mus rau hauv paus cheeb tsam
Covwetting qauv(wetted zone) tsim los ntawm cov drip emitters ncaj qha txiav txim cov khoom noj hauv av. Ib tug raug drip emitter tsim ib tug wetted noob kwv yees li 30-45 cm nyob rau hauv lub cheeb thiab 30-40 cm tob, nyob ntawm seb cov av zoo nkauj, emission npaum li cas, thiab irrigation ntev.
Nyob rau hauv cov av xuab zeb, dej txav feem ntau downwards nrog txwv lateral kis, concentrating as-ham nyob rau hauv ib tug nqaim kem. Hauv cov av av nplaum, kev sib kis ntawm sab nraud yog ntau dua, tab sis qhov nkag mus tau qeeb dua. Nkag siab txog koj cov av wetting qauv tso cai rau koj los kho lub sij hawm fertigation thiab concentration kom phim cov hauv paus tis.
Lub functional fertigation system yuav tsum muaj cov hauv qab no:
| Cheebtsam | Muaj nuj nqi | Cov ntsiab lus tseem ceeb |
Tshuag Tank | Khaws cov concentrated fertilizer tov | 50-200 nkas loos peev; corrosion-resistant (polyethylene los yog fiberglass) |
Fertilizer Injector | Kos cov tshuaj concentrated rau hauv kab dej | Saib Tshooj 3 rau hom kev sib piv |
Thawj Lim | Tshem tawm cov khoom siv los ntawm cov dej | 80-120 mesh npo; rov qab ntxuav tau |
Secondary Lim | Tiv thaiv injector thiab emitters post -injection | 120-150 mesh; muab tso rau tom qab txhaj tshuaj |
Kuaj Valve | Tiv thaiv rov qab ntawm cov chiv rau hauv dej | Qhov tseem ceeb rau kev tiv thaiv kab mob |
Siab Gauges | Saib xyuas qhov system siab ntawm cov ntsiab lus tseem ceeb | Nruab ua ntej thiab tom qab lim |
Isolation Valves | Tso cai cais ntu rau kev saib xyuas | Pob li qub pom zoo |
Kev txhim kho kom tsim nyog los ntawm qhov chaw dej mus rau qhov chaw yog:
Dej qhov chaw → Backflow Preventer → Primary Filter → Pressure Regulator →
Fertilizer Injector → Secondary Lim → Pressure Gauge → Mainline → Laterals → Emitters
Feem ntau kev ua liaj ua teb txuas ntxiv pom zoo kom tso cov tshuaj chivtom qablub siab regulator tab sisua ntejlub lim thib ob. Qhov no tiv thaiv cov tshuaj tiv thaiv los ntawm cov khib nyiab thaum ua kom lub lim tshem tawm cov khoom tsis huv ua ntej dej mus txog emitters.
Txawm li cas los xij, qee tus neeg tsim khoom pom zoo kom txhim kho lub injectorua ntejthawj lim kom ntes undissolved fertilizer hais ua ntej lawv nkag mus rau hauv lub system. Txoj hauv kev no ua haujlwm tau zoo thaum siv cov khoom siv siab - zoo tag nrho soluble chiv tab sis muaj kev pheej hmoo ua rau cov tshuaj tiv thaiv nrog cov khoom sib xyaw. Xaiv txoj hauv kev uas phim koj cov dej zoo thiab cov chiv purity.
Installation Configurations
Bypass voj voog:Txoj kev teeb tsa feem ntau. Lub injector rub cov tshuaj los ntawm lub tank tso rau hauv lub tank thiab txhaj nws mus rau hauv ib txoj kab bypass uas rejoins lub mainline downstream. Qhov kev teeb tsa no tso cai rau kev txhaj tshuaj yam tsis muaj kev cuam tshuam loj heev rau lub mainline flow rate lossis siab.
Inline Installation:Lub injector yog ntsia ncaj qha rau hauv lub mainline. Ntau dua nrog cov twj tso zis zoo (cov twj tso kua mis). Yuav tsum ua tib zoo ntsuas qhov ntsuas.
Xaiv qhov tsim nyog injector yog ib qho kev txiav txim siab tseem ceeb tshaj plaws hauv kev tsim fertigation system. Peb txoj kev xaiv tseem ceeb muab kev lag luam sib txawv - tawm ntawm tus nqi, qhov tseeb, thiab kev ua haujlwm nyuaj.
Venturi injectors ua haujlwm ntawm Bernoulli txoj cai. Raws li cov dej ntws los ntawm ib qho kev txwv, qhov nrawm nce thiab siab txo qis, tsim kom muaj lub tshuab nqus tsev uas nqus cov tshuaj los ntawm lub tank.
Qhov zoo:
- Tsis xav tau hluav taws xob
- Yooj yim, tsis muaj qhov txav
- Tus nqi pib qis
- Zoo heev rau qhov chaw nyob deb tsis muaj zog
Qhov tsis zoo:
- Siv 10-25% ntawm qhov system ntws raws li bypass
- Precision sib txawv nrog lub siab sib txawv
- Tsis haum rau -tso siab heev (<15 PSI)
- Kev txhaj tshuaj piv hloov pauv nrog kev hloov pauv ntawm qhov ntws
Kev ua haujlwm:Nruab on bypass voj. Kho lub throttle valve kom tswj tus nqi txhaj tshuaj. Kev txwv kev txwv siab dua ua rau kom nqus tau ntau dua (ntau txhaj) tab sis txo qis bypass ntws.
Lub tank siab sib txawv (tseem hu ua venturi tso tsheb hlau luam lossis los ntawm -pass tanks) yog cov txheej txheem passive uas cov kua dej ntws los ntawm lub tank txuas nrog thoob plaws lub siab sib txawv hauv lub ntsiab.
Qhov zoo:
- Tsis muaj hluav taws xob
- Kev saib xyuas tsawg heev
- Kev ua haujlwm yooj yim
- Zoo rau cov qoob loo zoo ib yam nrog cov khoom noj khoom haus ruaj khov
Qhov tsis zoo:
- Kev txhaj tshuaj yog siab tshaj ntawm tag nrho lub tank thiab txo qis thaum lub tank tsis muaj
- Concentration sib txawv thaum lub sij hawm txhaj tshuaj
- Tsawg tank peev xwm
- Tsis haum rau qhov kev hloov pauv ntau zaus
Kev ua haujlwm:Tank sau los ntawm mainline los ntawm ib qhov chaw nres nkoj; chiv tawm los ntawm lwm qhov chaw nres nkoj mus rau hauv kab rov qab. Raws li qib tank poob, qhov concentration gradient hloov, txo qhov kev txhaj tshuaj.
Dosing twj xa cov meej, kho qhov ntim ntawm cov tshuaj chiv tsis hais cov dej ntws los yog siab.
Qhov zoo:
- Siab precision (± 2-5%)
- Tus nqi txhaj tshuaj ywj siab ntawm cov dej siab
- Yooj yim kho rau cov qoob loo sib txawv lossis theem kev loj hlob
- Yuav ua tau automated thiab integrated nrog fertigation controllers
- Haum rau kev txhaj tshuaj me me heev
Qhov tsis zoo:
- Yuav tsum muaj hluav taws xob
- Tus nqi pib siab dua
- Kev kho kom yooj yim dua
- Tej zaum yuav xav tau kev lim dej ua ntej lub twj tso kua mis
Kev ua haujlwm:Teem tus nqi txhaj tshuaj hauv mL / min lossis GPH ncaj qha. Lub twj tso kua mis rub tawm los ntawm cov khoom ntim khoom thiab txhaj tshuaj rau hauv kab dej. Qee cov qauv suav nrog ua- hauv kev saib xyuas kev khiav thiab kev tawm tswv yim tswj.
Raws li kev taw qhia luam tawm los ntawm Tuam Tshoj Ministry of Agriculture:
- Hauv qab 100 mu (16.5 acres):Dej- cov twj siv hluav taws xob lossis cov tshuab txhaj tshuaj tau pom zoo
- Ntau tshaj 100 mu (16.5 acres):Pressurized txhaj nrog automated fertigation controllers nyiam
- Large-scale operations (>500 mu / 82 daim av):Tag nrho automation nrog EC / pH xyuas thiab sib txawv - tus nqi txhaj tshuaj
Tsis yog tag nrho cov chiv tsim nyog rau fertigation. Qhov kev xav tau tiag tiag yogua kom tiav cov dej solubility- tej yam uas tsis tau muab tshem tawm yuav thaiv cov emitters thiab puas tsuaj rau cov tshuaj txhaj tshuaj.
Fertilizers haum rau Fertigation
| Cov chiv | N-P₂O₅-K₂O | Solubility (g / L ntawm 68 ° F) | Sau ntawv |
Urea | 46-0-0 | 1,080 | Feem ntau N qhov chaw |
Potassium Nitrate (KNO₃) | 13-0-44 | 316 | N + K dual qhov chaw; khoom premium |
Ammonium Nitrate (AN) | 34-0-0 | 1,950 | Siab N; muaj sai sai |
Monoammonium Phosphate (MAP) | 11-52-0 | 374 | N + P qhov chaw; me ntsis acidic |
Diammonium Phosphate (DAP) | 18-46-0 | 588 | N + P; zam hauv dej alkaline |
Potassium Sulfate (SOP) | 0-0-50 | 111 | Hwm K qhov chaw; qis ntsev index |
Calcium Nitrate (CN) | 15.5-0-0 | 1,290 | N + Ca; tseem ceeb rau txiv hmab txiv ntoo zoo |
Magnesium Sulfate (Epsom ntsev) | 0-0-0 | 710 | Mg + S; yog qhov tsis txaus |
Chelated Micronutrients (Ntau yam) | Kab | Siab | Fe, Zn, Mn, Cu, B, Mo |
Tsis txhob siv cov hauv qab no hauv drip systems:
- Ammonium sulfate + calcium nitrate (ua insoluble calcium sulfate)
- Phosphoric acid + calcium nitrate (precipitates calcium phosphate)
- Txhua yam chiv uas muaj insoluble extenders los yog fillers
- Ncaj pob zeb phosphate los yog yooj yim slag
- Bulk blended chiv (tshwj tsis yog lav tag nrho soluble)
Qhov no compatibility matrix yog qhov tseem ceeb tshaj plaws siv rau kev nyab xeeb fertigation. Kev sib xyaw cov chiv tsis sib xws hauv tib lub tank tsim cov dej tsis sib haum uas yuav txhaws koj lub cev tag nrho.
| | Urea | KNO ₃ | NH₄NO₃ | H₃PO₄ | K₂SO₄ | Ca(NO₃)₂ | MgSO₄ | Chelated Micro |
|---|
| Urea | - | √ | √ | √ | √ | √ | √ | √ |
| KNO ₃ | √ | - | √ | √ | √ | √ | √ | √ |
| NH₄NO₃ | √ | √ | - | √ | √ | √ | √ | √ |
| H₃PO₄ | √ | √ | √ | - | √ | × | × | √ |
| K₂SO₄ | √ | √ | √ | √ | - | × | √ | √ |
| Ca(NO₃)₂ | √ | √ | √ | × | × | - | × | × |
| MgSO₄ | √ | √ | √ | × | √ | × | - | √ |
| Chelated Micro | √ | √ | √ | √ | √ | × | √ | - |
Txoj Cai 1: Calcium yeej tsis muaj leej faj lossis phosphorus hauv tib lub tank.
Calcium (los ntawm calcium nitrate) yuav precipitate tam sim ntawd thaum tov nrog:
- Sulfate (los ntawm poov tshuaj sulfate, magnesium sulfate)
- Phosphate (los ntawm phosphoric acid, MAP, DAP)
Txoj Cai 2: Qhov Ob -Tej Kev daws
Thaum koj cov qoob loo xav tau ob qho tib si calcium thiab phosphorus (feem ntau hauv cov qoob loo txiv hmab txiv ntoo), siv ob lub tank cais:
- Tank A:Calcium nitrate daws
- Tank B:Phosphoric acid los yog acidulated phosphorus tov
Txhaj txhua ntawm cov ntsiab lus txhaj tshuaj sib cais, lossis lwm lub sijhawm txhaj tshuaj kom cov kev daws teeb meem tsis tau ntsib hauv cov kav dej yam tsis muaj dilution.
Txoj Cai 3: Chelated micronutrients xav tau kev saib xyuas.
Hlau chelate tsis sib haum nrog calcium nitrate hauv tib lub tank. Lwm cov micronutrient chelates (Zn, Mn, Cu) feem ntau sib xws nrog calcium tab sis xyuas cov khoom tshwj xeeb.
| Loj hlob nruab nrab | Lub hom phiaj EC (mS/cm) | Lub hom phiaj pH | Sau ntawv |
| Av-raws li kev tsim khoom | 1.0-3.0 | 5.5-6.5 | Tsawg kawg rau cov qoob loo rhiab heev |
| Soilless / hydroponic | 1.5-3.5 | 5.5-6.0 | Nws txawv ntawm cov qoob loo thiab kev loj hlob theem |
| Sandy av | 0.8-2.0 | 6.0-6.5 | Tsawg concentrations vim ceev leaching |
Tau qhov twg los: UF/IFAS, Punjab Agriculture phau ntawv
Kev xam qhov tseeb ntawm fertigation kom ntseeg tau tias cov qoob loo tau txais cov as-ham zoo raws sijhawm thaum tsis txhob pov tseg thiab ib puag ncig poob.
Kauj Ruam 1: Txiav txim siab Tag Nrho Cov Khoom Noj Rau Lub Caij Nyoog
Pib nrog cov txiaj ntsig kev sim av thiab cov ntaub ntawv tshem tawm cov qoob loo. Tus qauv kev tshem tawm cov qoob loo yog qhov zoo- sau los ntawm cov kev pabcuam txuas ntxiv.
Kauj Ruam 2: Tshem cov ntawv thov Preplant
Yog tias koj twb tau siv ib feem ntawm cov as-ham (tshwj xeeb tshaj yog phosphorus thiab potassium), rho cov nyiaj ntawm tag nrho cov kev xav tau.
Kauj Ruam 3: Xam cov nqi txhaj tshuaj txhua lub lim tiam
Faib cov khoom noj uas tseem tshuav los ntawm tus naj npawb ntawm fertigation lub lis piam. Kho rau lub caij nyoog xav tau curves (ntau dua thaum lub sij hawm kev loj hlob, tsawg dua thaum tsim thiab maturation).
Kauj Ruam 4: Hloov mus rau Fertilizer Cov Khoom Muag
Tus account rau qhov feem pua ntawm cov as-ham hauv koj cov khoom siv chiv xaiv.
Kauj Ruam 5: Xam Dilution thiab Injection Parameters
Txiav txim siab cov tshuaj hauv Tshuag thiab xyuas kom meej tias koj lub tshuab txhaj tshuaj tuaj yeem xa tus nqi xav tau.
Muab cov ntaub ntawv:
- Hom qoob loo: ua cov txiv lws suav
- Thaj tsam: 1 acre
- Lub caij loj hlob: 14 lub lis piam
- Av: Nruab nrab -textured loam
- Cov khoom siv fertigation uas twb muaj lawm: Venturi injector, 50-gallon Tshuag tank
- System flow rate: 20 GPM
- Injector bypass tus nqi: 0.5 GPM
Kauj ruam 1: Txiav txim siab tag nrho N Requirement
- Source: Mississippi State University Extension pom zoo 120 lbs N / acre rau kev ua txiv lws suav
- Tag Nrho N xav tau: 120 lbs/acre/season
Kauj Ruam 2: Tshem Tawm Preplant N
- Preplant daim ntawv thov: 24 lbs N / acre (20% ntawm tag nrho, ib txwm pib koob)
- N yuav tsum tau xa los ntawm fertigation: 120 - 24 =96 lbs N / acre
Kauj Ruam 3: Xam cov nqi txhua lub limtiam N
Raws li MSU kev loj hlob theem pom zoo:
- Lub lis piam 1-3 (Hloov mus rau thawj paj): 3-5 lbs N / acre / wk →Qhov nruab nrab: 4 lbs
- Lub lis piam 4-6 (Cov txiv hmab txiv ntoo thaum ntxov): 6-8 lbs N / acre / wk →Qhov nruab nrab: 7 lbs
- Lub lis piam 7-10 (Peak fruit development): 8-10 lbs N/acre/wk →Qhov nruab nrab: 9 lbs
- Lub lis piam 11-14 (Lub caij lig/ripening): 5-7 lbs N/acre/wk →Qhov nruab nrab: 6 lbs
- Tag nrho: (3 × 4) + (3 × 7) + (4 × 9) + (4 × 6)=12 + 21 + 36 + 24 =93 lb ua✓ (ze rau lub hom phiaj ntawm 96)
Kauj Ruam 4: Hloov mus rau cov khoom siv chiv (Siv Urea 46-0-0)
- Siv Lub Limtiam 7 tus nqi piv txwv: 9 lbs N / acre / lub limtiam xav tau
- Urea 46-0-0 muaj 46% N
- Urea xav tau: 9 lbs N ÷ 0.46 =19.6 lbs urea/acre/lub lim tiam
Kauj Ruam 5: Xam Dilution thiab Injection Parameters
- Lub tank ntim: 50 nkas loos
- Urea hauv tank: 19.6 lbs ÷ 50 gal =0.392 lbs/gal
- Kev txhaj tshuaj piv: 20 GPM ÷ 0.5 GPM =40:1
- Kev ua tau zoo ntawm cov nroj tsuag: 0.392 lbs / gal ÷ 40 =0.0098 lbs N / gal irrigation dej
FORMULA 1: Cov Khoom Noj Yuav Tsum Tau (lbs/acre)=Lub Caij Tag Nrho - Preplant Tus Nqi
FORMULA 2: Fertilizer Product Needed (lbs)=Nutrient Required (lbs) ÷ % Nutrient in Product
FORMULA 3: Injection Ratio=System Flow Rate (GPM) ÷ Injector Output (GPM)
FORMULA 4: Dilution Rate (lbs/gal)=Fertilizer Product (lbs) ÷ Tank Volume (gal)
FORMULA 5: Kev Cuam Tshuam Zoo (lbs/gal)=Dilution Rate ÷ Injection Ratio
Source: Mississippi State University Extension
| Kev loj hlob theem | Lub lis piam | N (lbs/acre/wk) | K₂O (lbs/acre/wk) |
| Hloov mus rau thawj paj | 1-3 | 3-5 | 3-5 |
| Cov txiv hmab txiv ntoo thaum ntxov | 4-6 | 6-8 | 6-8 |
| Peak txiv hmab txiv ntoo kev loj hlob | 7-10 | 8-10 | 10-12 |
| Caij nplooj zeeg / ripening | 11-14 | 5-7 | 6-8 |
Cov ntsiab lus tseem ceeb:
- Potassium xav tau nce siab thaum lub sij hawm thauj cov txiv hmab txiv ntoo - tuav K:N piv> 1.0 thaum lub lis piam 7-10
- Calcium tseem ceeb thaum lub sij hawm txiv hmab txiv ntoo faib (lub lis piam 4-8) - siv cov calcium cais tank
- Tsis txhob lig dhau -lub caij N uas txhawb nqa kev loj hlob ntawm cov txiv hmab txiv ntoo qhuav
Tau qhov twg los: University of Arkansas FSA6160, Punjab Agriculture
| Kev loj hlob theem | Lub lis piam | N (lbs/acre/wk) | K₂O (lbs/acre/wk) |
| Emergency rau V6 | 1-4 | 2-3 | 2-3 |
| Kev loj hlob sai (V7-VT) | 5-8 | 5-8 | 4-6 |
| Silking rau grain filling | 9-12 | 3-5 | 4-6 |
Cov ntsiab lus tseem ceeb:
- Cov pob kws qab zib muaj lub sijhawm luv luv N lub sijhawm - ploj lawm V7-VT qhov rais ua rau tsis tuaj yeem tawm los poob
- K tseem ceeb rau stalk lub zog thiab pob ntseg sau
- Fertigation qhov rais feem ntau 60-90 hnub tom qab tshwm sim
Source: UC Davis, UF/IFAS
| Kev loj hlob theem | N (lbs/acre/wk) | K₂O (lbs/acre/wk) | Ca (lbs/acre/wk) |
| Kev tsim kho | 0.5-1.0 | 0.5-1.0 | 0.3-0.5 |
| Kev loj hlob | 1.0-1.5 | 1.0-1.5 | 0.5-0.8 |
| Flowering rau txiv hmab txiv ntoo | 1.0-1.5 | 1.5-2.5 | 0.8-1.0 |
| Peak sau | 0.8-1.2 | 2.0-3.0 | 0.5-0.8 |
Cov ntsiab lus tseem ceeb:
- Strawberry txiv hmab txiv ntoo zoo ncaj qha cuam tshuam nrog K qib - lub hom phiaj 2.0-3.0 lbs K₂O thaum sau
- Calcium tseem ceeb rau txiv hmab txiv ntoo firmness thiab txee lub neej
- EC kev tswj xyuas qhov tseem ceeb - txiv hmab txiv ntoo Brix teb rau EC hloov kho
Tau qhov twg los: Punjab Agriculture, Suav Ministry of Agriculture 2026
| Kev loj hlob theem | N (kg/ha/kw) | K₂O (kg/ha/wk) |
| Seedling rau squaring | 1.0-1.5 | 0.5-1.0 |
| Flowering mus rau lub ncov Bloom | 2.0-3.0 | 1.5-2.5 |
| Kev txhim kho pob | 1.5-2.0 | 2.0-3.0 |
| Lub caij nyoog kawg | 0-1.0 | 1.0-1.5 |
Cov ntsiab lus tseem ceeb:
- N ntau dhau ua rau kev loj hlob, ncua kev loj hlob, thiab nce boll rot
- K tseem ceeb rau fiber ntau zog thiab lint zoo
- Fertigation feem ntau khiav 75-100 hnub txij li thawj zaug tawg
Source: Suav Ministry of Agriculture 2026 kev taw qhia
| Qoob loo | Irrigation Volume (m³/acre/season) | N (kg/ha/lub caij) | K₂O (kg/ha/season) | Target EC |
| Tsev cog khoom txiv lws suav | 120-150 | 200-250 | 250-300 | 2.0-3.0 mS/cm |
| Tsev cog khoom dib | 180-220 | 180-220 | 220-280 | 2.0-3.5 mS/cm |
Cov ntsiab lus tseem ceeb:
- Kev tsim tsev cog khoom tso cai rau xyoo -ib puag ncig fertigation nrog kev xa khoom noj tsis tu ncua
- Kev tswj hwm EC hloov pauv tus lej thov tus lej suav
- Lub hom phiaj EC hloov kho raws li cov lus pom ntawm cov nroj tsuag (tus nqi loj hlob, txiv hmab txiv ntoo zoo, nplooj xim)
Lub voj voog 3-theem yuav tsum tau muab faib ua kom zoo tsis hais txog tag nrho cov dej siv sijhawm:
| Irrigation Duration | Pre-Wet Phase | Txhaj Phaj | Flush Phase |
| 60 feeb | 12-15 feeb (20-25%) | 30-36 feeb (50-60%) | 12-15 feeb (20-25%) |
| 90 feeb | 18-22 feeb | 45-54 feeb | 18-22 feeb |
| 120 feeb | 24-30 feeb | 60-72 feeb | 24-30 feeb |
Hla los yog ua kom luv luv ua ntej -thaum ntub dej:
- Fertilizer tunneling los ntawm qhuav av dhau los ntawm lub hauv paus cheeb tsam
- Cov zaub mov poob qis hauv qab thaj tsam hauv paus
- Hauv paus kev puas tsuaj los ntawm concentrated fertilizer daws nyob rau hauv qhuav av
Hla los yog shortening lub flush theem ua rau:
- Emitter clogging los ntawm crystallized fertilizer ntsev
- Corrosion ntawm metallic system Cheebtsam
- Undelivered as-ham tseem tshuav nyob rau hauv kab
Lub sijhawm tso dej tsawg kawg yog 20-25% ntawm tag nrho cov dej ntws.Qhov tsawg kawg nkaus 30-feeb feeb yog pom zoo thaum txhaj tshuaj tiv thaiv siab lossis siv cov chiv uas ua rau nag lossis daus.
Lub sijhawm zoo tshaj plaws:Thaum sawv ntxov (kaj sawv ntxov txog 9 teev sawv ntxov) lossis yav tav su lig (tom qab 5 teev tsaus ntuj)
Yog vim li cas:
- evaporation losses minimized
- Av kub nruab nrab - zoo rau cov as-ham
- Cua feem ntau nyob ntsiag to rau kev faib tawm
- Cov dej qoob loo xav tau nce mus txog thaum sawv ntxov
Zam:Thaum nruab hnub txhaj tshuaj thaum kub, qhuav. Cov evaporation tuaj yeem mloog cov khoom noj rau ntawm nplooj nplooj ua rau kub hnyiab, thiab cov dej hauv av txav tau tsawg dua.
| Av Texture | Pom zoo zaus | Kev xav |
| Sandy av | Txhua hnub rau txhua hnub | Tsawg dej- tuav peev xwm; cov as-ham leach sai |
| Loam | 2-3 zaug ib lub lim tiam | Kev khaws cia nruab nrab; ob lub lis piam txais tau |
| Av nplaum | 1-2 zaug hauv ib lub lis piam | Cov dej siab - tuav peev xwm; qeeb nutrient zog |
| Soilless media | Txhua qhov kev tshwm sim irrigation | Tsis muaj; cov as-ham muab nrog txhua qhov dej |
Niaj hnub nimno fertigation controllers tuaj yeem ua rau tag nrho 3-theem voj voog, kho cov nqi txhaj tshuaj raws li cov lus pom zoo, thiab koom nrog cov ntaub ntawv huab cua rau lub sijhawm raug.
| Parameter | Qhov Zoo Tshaj Plaws | Kev cuam tshuam yog Tawm ntawm qhov ntau | Txoj Cai Kho |
| pH | 6.0-7.0 | Muaj feem cuam tshuam rau kev muaj zaub mov | Acid injection if >7.0 |
| EC | <1.5 mS/cm | High EC txo cov dej txaus | Dilution; txo cov chiv |
| Hardness (Ca) | <150 mg/L | Precipitates nrog P, PO₄ | Chelation; txhaj tshuaj acid |
| Alkalinity (HCO₃) | <2 meq/L | Tsis muaj pH; Ca / Mg | Kev txhaj tshuaj acid |
| Hlau (Fe) | <5 mg/L | Clogs emitters; stains | Kev lim dej; kev txiav txim |
| Sulfide (H₂S) | <0.1 mg/L | Corrodes Cheebtsam | Oxidation; lim |
When using high-EC water (>1.5 mS/cm) rau fertigation, kev tswj ntxiv yog yuav tsum tau:
Tshwj xeeb fertigation raws tu qauv rau saline dej:
- Txo cov chiv concentration los ntawm 25-50% ntawm cov nqi ib txwm muaj
- Ualeaching feem irrigation: Siv 20-30% dej ntau dhau ib ntus kom yaug cov ntsev hauv qab hauv paus cheeb tsam
- Ua cov txheej xwm leaching irrigation txhua 15-20 hnub siv 1.2-1.5 × ib txwm irrigation ntim
- Lub hom phiaj hauv paus cheeb tsam EC hauv qab 4.0 mS / cm
Acid Txhaj rau pH kho
Thaum dej alkalinity siab los yog thaum precipitates tsim nyob rau hauv lub system, acid txhaj yuav tsum tau:
Acidic chiv raws li pH tswj:Muaj ntau cov kev pabcuam chiv ua tiav suav nrog phosphoric acid kom tswj tau cov kua qaub, tshwj xeeb tshaj yog thaum siv dej alkaline. Qhov no txo qhov kev xav tau ntawm cov kua qaub sib cais.
Fertigation nrog subsurface drip irrigation (faus drip kab) yuav tsum xav txog ntxiv:
- Lub sijhawm txhaj tshuaj yuav tsum suav rau qhov nce siab ntawm cov dej thiab cov as-ham
- Hauv paus nkag mus rau hauv cov emitters yog qhov txaus ntshai - siv RootGuard® thev naus laus zis lossis txhaj tshuaj tiv thaiv
- Flush cycles tej zaum yuav xav tau ntev dua vim qhov ntim qhov tob
- Fertilizers uas precipitate yog txwv tsis pub - siv tsuas yog soluble heev, sib haum formulations
EC Saib Xyuas:
- Ntsuas EC ntawm cov tshuaj hauv Tshuag txhua hnub ua ntej txhaj tshuaj
- Ntsuas EC ntawm emitters txhua lub lim tiam (los yog siv inline EC sensors rau kev soj ntsuam tas li)
- Sib piv qhov tseeb piv rau qhov xav tau EC txhawm rau txhawm rau txhawm rau txhawm rau ua haujlwm tsis zoo lossis suav qhov yuam kev
Kev soj ntsuam pH:
- Ntsuas pH ntawm cov tshuaj hauv Tshuag thiab emitter tso zis
- Lub hom phiaj ntau: 5.5-6.5 rau feem ntau cov qoob loo
- pH drift qhia txog kev hloov pauv dej zoo lossis cov chiv tsis sib haum
Flow thiab Pressure:
- Saib xyuas qhov system siab ntawm ntau lub ntsiab lus
- Txheeb xyuas qhov sib txawv ntawm qhov sib txawv txhua lub lim tiam - rov qab thaum qhov sib txawv tshaj 10 PSI
- Txheeb xyuas cov emitter ntws tus nqi txhua hli (catch volume method)
| Cov tsos mob | Tej yam ua rau | Txoj Cai Kho |
Kev loj hlob tsis sib xws ntawm cov nroj tsuag | Distribution uniformity teeb meem | Xyuas cov emitter tso zis uniformity; tshem tawm laterals; txheeb xyuas qhov sib npaug siab |
Emitter clogging tom qab fertigation | Tsis tiav flush / incompatible fertilizer mix | Txuas ntxiv rau theem dej ntws mus rau 30+ min yam tsawg kawg nkaus; tshuaj xyuas compatibility matrix; ua kua qaub |
Dawb crust ntawm emitters | Calcium carbonate nag lossis daus | Txhaj kua qaub (nitric nyiam) kom qis pH qis dua 6.0; nce lub sij hawm flush; xav txog dej softening |
Tank precipitate txoj kev | Sib tov cov chiv tsis sib xws | Tam sim ntawd ntws thiab huv lub tank; phua rau hauv A / B tso tsheb hlau luam rau kev sib xyaw matrix |
Salt buildup nyob rau hauv lub hauv paus cheeb tsam | Siab EC dej + ntau dhau fertigation | Qhov kev tshwm sim irrigation; txo cov chiv concentration; kuaj dej qhov chaw EC |
EC nyeem ntawv siab dhau ntawm emitter | Kev daws teeb meem tshaj -ntseeg | Dilute Tshuag tov; txheeb xyuas qhov kev txhaj tshuaj piv xam |
Cov qoob loo hlawv (nplooj npoo npoo necrosis) | Tshaj -fertilization lossis txhaj tshuaj tsis sib xws | Txo tus nqi los ntawm 25-30%; txheeb xyuas lub sijhawm ua ntej ntub dej; check injector calibration |
| ** injector tsis kos duab ** | Cua ntws; thaiv; tsis txaus siab sib txawv | Tshawb xyuas kev sib txuas rau cov dej xau; huv lim; txheeb xyuas qhov system siab ua tau raws li qhov xav tau ntawm lub tshuab |
Fertigation yog kev xyaum siv dej- cov tshuaj soluble chiv los ntawm kev siv dej, feem ntau yog drip irrigation. Tsis zoo li cov txheej txheem ib txwm siv uas cov chiv tau tshaj tawm los yog banded ntawm cov av saum npoo, fertigation muab cov as-ham yaj hauv dej ncaj qha mus rau thaj chaw cog qoob loo. Qhov kev xa tawm no txhim kho kev siv cov khoom noj zoo los ntawm 30-50% (ib txwm) mus rau 80-95% (fertigation), thaum tib lub sijhawm txuag kev ua haujlwm thiab ua kom lub sijhawm meej raws li cov qoob loo loj hlob.
Tsis muaj.Tsuas yog dej tag nrho xwb - cov chiv soluble yog tsim rau drip fertigation. Txhua yam uas tsis tau muab tshem tawm yuav txhaws cov emitters thiab puas tsuaj rau cov tshuaj. Ua ntej yuav khoom, xyuas kom tiav solubility. Cov chiv uas tsim nyog muaj xws li urea (46-0-0), potassium nitrate (13-0-44), ammonium nitrate (34-0-0), MAP (11-52-0), potassium sulfate (0-0-50), thiab chelated micronutrients. Tsis txhob siv cov chiv nrog cov fillers, extenders, lossis insoluble Cheebtsam.
Ntau zaus nyob ntawm hom av thiab qoob loo:
- Sandy av:Txhua hnub rau txhua hnub (dej tsawg- tuav peev)
- Loam / av nplaum:2-3 zaug ib lub lim tiam
- Soilless/Hydroponic media:Txhua qhov kev tshwm sim irrigation
- Cov qoob loo txhua xyoo:Kho zaus mus rau theem kev loj hlob - ntau dua thaum lub sijhawm xav tau siab tshaj, tsawg dua thaum tsim thiab loj hlob
Lub hom phiaj EC txawv los ntawm kev loj hlob nruab nrab:
- Av-raws li kev tsim khoom:1.0-3.0 mS/cm
- Soilless/Hydroponic:1.5-3.5 mS / cm3
- Sandy av:0.8-2.0 mS / cm (qis dua vim muaj kev pheej hmoo leaching)
Saib xyuas EC ntawm lub emitter, tsis yog nyob rau hauv Tshuag tank. Hauv paus cheeb tsam EC txiav txim siab cov qoob loo teb tiag.
Tsis muaj.Calcium nitrate thiab potassium sulfate yogtsis sib haumnyob rau hauv tib lub tank. Thaum sib tov, lawv tsim cov calcium sulfate (gypsum) precipitate, uas yuav tam sim ntawd txhaws koj lub drip system. Thaum cov qoob loo xav tau ob qho tib si calcium thiab potassium, siv cov tank cais:
- Tank A:Calcium nitrate
- Tank B:Potassium sulfate (los yog lwm qhov chaw poov tshuaj tsis muaj sulfate)
Cov cim qhia txog kev ua haujlwm zoo:
- Uniform cog kev loj hlob thoob plaws hauv cheeb tsam
- EC ntawm emitters sib tw suav lub hom phiaj
- Tsis muaj precipitate hauv Tshuag tank tom qab sib tov
- Tsis muaj crusting los yog ntsev buildup ntawm emitters
- Cov lim dej tseem huv si (qhov sib txawv siab ntau dhau qhia tias muaj teeb meem)
Ua txhua hli emitter ntes cov kev ntsuam xyuas kom paub tseeb tias ntws sib xws.
Tus nqi ntau tshaj - qhov nkag tau zoo yog aventuri txhaj tshuaj($50-200) nrog apolyethylene stock tank($100-200). Qhov kev teeb tsa no yuav tsum tsis muaj hluav taws xob thiab tuaj yeem ntsia tau rau feem ntau cov dej ntws uas twb muaj lawm. Kev lag luam tawm yog qis dua (± 10-15%) piv rau cov twj tso kua mis, tab sis rau ntau cov qoob loo thiab kev ua haujlwm, qib kev tswj hwm no txaus.
Yog lawm,tab sis nrog kev xav ntxiv:
- Fertigation lub sij hawm yuav tsum suav rau nce dej txav hauv av
- Hauv paus nkag mus rau hauv faus emitters yog ib qho kev pheej hmoo - siv cov hauv paus- tiv thaiv emitters lossis tiv thaiv cov kua qaub
- Flush lub sij hawm yuav tsum tau ncua kom tshem tawm qhov tob system ntim
- Tsuas yog cov feem ntau soluble, tshaj chiv yuav tsum tau siv
Ua raws li cov cai tiv thaiv no:
- Siv tsuas yog soluble chiv- yeej tsis cuam tshuam rau kev solubility
- Ua raws li cov matrix compatibility- kev sib xyaw ua ke tsis sib xws tsim cov dej nag
- Tsis txhob hla lub sijhawm yaug- yam tsawg kawg nkaus 20-25% ntawm kev siv dej
- Saib xyuas thiab tswj cov lim dej- rov qab ntxuav thaum qhov sib txawv siab tshaj 10 PSI
- Ua cov kua qaub rau peb lub hlis twg- 0.5-1.0% kua qaub circulated rau 30-60 feeb
- Ntsuas dej zoo- siab calcium lossis hlau dej yuav tsum tau kho
Yog, nrog ceev faj.Qhov kev xyaum no hu ua"chemigation"thiab yog kev cai lij choj nyob rau hauv feem ntau jurisdictions nrog tsim nyog backflow khoom tiv thaiv. Txawm li cas los xij:
- Tsuas yog siv cov tshuaj tua kab tshwj xeeb uas sau npe rau chemigation
- Xyuas cov tshuaj tua kab solubility thiab compatibility nrog koj cov chiv (yog tias tank -mixed)
- Qee cov tshuaj tua kab tuaj yeem ua rau cov drip Cheebtsam lossis clog emitters
- Ua raws li txhua daim ntawv lo rau cov nqi txhaj tshuaj thiab dej ntws tawm
- Nrog rau cov kev pabcuam txuas ntxiv hauv cheeb tsam rau cheeb tsam - cov cai tshwj xeeb
Fertigation sawv cev rau kev hloov pauv tseem ceeb los ntawm daim ntawv qhia hnub -raws li fertilization rau kev thov- tsav kev tswj cov khoom noj. Los ntawm kev xa tawm raws nraim li cas cov qoob loo xav tau, meej meej thaum lawv xav tau, fertigation txhim kho chiv efficiency los ntawm 30-50 feem pua ntawm cov ntsiab lus piv rau cov qauv siv.
Kev nqis peev hauv ib qho kev cog qoob loo feem ntau them rau nws tus kheej hauv 1-3 lub caij cog qoob loo los ntawm kev txuag nyiaj hauv cov nqi chiv, kev ua haujlwm, thiab kev txhim kho cov qoob loo. Txawm tias kev ua haujlwm me me tuaj yeem siv cov venturi-based fertigation rau qis dua $ 1,000 toj ib acre.
Kev vam meej yuav tsum tau ua tib zoo saib xyuas cov hauv paus ntsiab lus: ua kom tiav cov chiv solubility, compatibility ntawm tank - sib tov cov neeg koom tes, tsim nyog 3- lub sij hawm txhaj tshuaj, thiab kev saib xyuas tsis tu ncua. Phau ntawv qhia no muab lub hauv paus kev - hloov cov ntsiab cai no rau koj cov qoob loo, av, thiab dej.
