Yuav Txiav Txim Li Cas Ntawm EDTA-Fe thiab EDDHA-Fe
Covav / media pHyog qhov kev txiav txim siab #1, ua raws li kev thov, hom av, nqi, thiab chlorosis hnyav.
1. Core Stability pH Threshold (Txoj Cai Tseem Ceeb)
EDTA-Fe
Stable & siv tau nkaus xwb:pH 3.0-6.5
At pH >6.5: EDTA tawg yooj yim. Ca²⁺/Mg²⁺ nyob rau hauv alkaline av tshem tawm Fe³⁺, hlau precipitates rau insoluble hlau hydroxide (cov nroj tsuag tsis tuaj yeem nqus tau)
Completely ineffective for root feeding in pH >7.0 ua
EDDHA-Fe
Ultra-wide ruaj khov ntau yam:PH 3.0-11.0
Khaws cov hlau chelated txawm tias muaj zog alkaline, calcareous, siab -bicarbonate av (pH txog 9-10)
Tawm tsam kev sib tw los ntawm Ca, Mg, thiab lwm yam cations hauv txiv qaub- cov av nplua nuj
2. Kauj Ruam -los ntawm - Kauj Ruam Kev Txiav Txim Flowchart
Kauj Ruam 1: Ntsuas av / nutrient tov pH
Case A: pH tsawg dua lossis sib npaug li 6.5 (acidic / me ntsis nruab nrab)
✅ XaivEDTA-Fe
Pros: Tus nqi qis dua, cov ntsiab lus Fe ntau dua (~ 12–13% Fe vs 6% rau EDDHA-Fe), kev cog qoob loo sai
Kev siv zoo tshaj plaws:
Foliar sprays (bypasses av pH nkaus)
Hydroponics / kab lis kev cai tsis muaj av nrog tswj pH tsawg
Cov kua qaub los yog peat-raws li cov xov xwm loj hlob
Kev kho me ntsis hlau chlorosis los ntawm kev txau nplooj
Case B: pH 6.5 - 11 (tsis nruab nrab, alkaline, calcareous, saline av)
✅ XaivEDDHA-Fe
Yuav tsum tau rau hauv paus drench, av tshaj tawm, los yog drip fertigation nyob rau hauv txiv qaub / alkaline teb
Kev siv zoo tshaj plaws:
Orchards, vineyards, txiv hmab txiv ntoo ntoo ntawm limestone av
Cov qoob loo nrog cov kab mob loj heev interveinal chlorosis (cov nplooj tshiab daj)
Irrigation dej nrog siab alkalinity / bicarbonates
Ntev -lub sij hawm tiv thaiv av hlau (cov nyhuv residual kav ntev dua)
Kauj ruam 2: Xyuas koj daim ntawv thov txoj kev
Foliar spray (txhua av pH): EDTA-Fe duaTxau nplooj zam av chemistry; EDTA yog pheej yig dua thiab yooj yim absorbed ntawm nplooj cuticles
Av hauv paus daim ntawv thov / av drench / drip irrigation:
pH<6.5 → EDTA-Fe
pH >6.5 → EDDHA-Fe (EDTA yuav poob ntawm no)
Kauj Ruam 3: Ntsuas cov av hom & kev sib tw ions
Xaiv EDDHA-Fe yog tias koj cov av muaj:
High txiv qaub / calcium carbonate (calcareous av)
High magnesium, siab bicarbonate irrigation dej
Saline / alkali av Cov cations strip hlau los ntawm EDTA tab sis NW nyuam qhuav cuam tshuam EDDHA cov nyiaj muaj zog chelate
Kauj Ruam 4: Tus nqi & kev lag luam sib npaug
EDTA-Fe: 3–4 × pheej yig dua ib kg; siab dua hlau concentration → tsawg npaum li cas rau foliar
EDDHA-Fe: Tus nqi siab dua, tab sis tsuas yog siv tau hauv paus hlau rau cov av alkaline; tsawg zaus reapplication xav tau
3. Cov lus sib piv ceev
| Qhov xwm txheej | EDTA-Fe | EDDHA-Fe |
|---|---|---|
| Ua tau zoo pH | 3.0–6.5 | 3.0–11.0 |
| Chelated Fe cov ntsiab lus | ~12.5% | ~6% |
| Nqi | Tsawg, kev lag luam | Siab hwm |
| Kev ua tau zoo hauv cov txiv qaub / alkaline av | Hmoov tsis zoo, hlau precipitates | Zoo heev, ruaj khov |
| Daim ntawv thov zoo tshaj plaws | Foliar spray, qis -pH hydroponics | Av cag pub, alkaline teb fertigation |
| Residual longevity nyob rau hauv av | Luv luv | Ntev - kav ntev |
| Qhov tshwm sim | Pleev daj hmoov | Tsaus liab -xim av hmoov |
4. Cov Cai Tshwj Xeeb Scenario
chlorosis me ntsis + acidic av: EDTA foliar spray yog txaus
Mob hnyav, rov tshwm sim hlau chlorosis ntawm txiv duaj, citrus, txiv hmab txiv ntoo (pH siab av): Tsuas yog EDDHA-Fe av kho ua haujlwm
Tsev cog khoom hydroponics nrog pH tswj hauv qab 6.2: Ib txwm EDTA-Fe los txiav nqi
Tsis muaj acid txhaj rau alkaline irrigation dej: Siv EDDHA-Fe hauv kab fertigation
Qhov Kawg Simple Txoj Cai ntawm Thumb
Txau nplooj → EDTA-Fe (ib qho av)
Pub cov hauv paus hniav hauv av pH<6.5 → EDTA-Fe
Feed roots in soil pH >6.5 → EDDHA-Fe