Tsis muaj ib lo lus teb rau lo lus nug ntawm "qhov twg nitrogen chiv yog qhov zoo tshaj plaws," vim ntau hom nitrogen chiv muaj lawv tus kheej cov yam ntxwv thiab cov xwm txheej siv tau. Kev xaiv cov chiv nitrogen zoo yuav tsum xav txog kev sib xyaw ua ke, suav nrog cov kev xav tau ntawm cov qoob loo, cov av hauv av, cov txheej txheem kev thov, thiab cov nqi siv nyiaj -kev ua tau zoo.
Muaj ntau hom nitrogen chiv, feem ntau suav nrog urea, ammonium sulfate, ammonium chloride, ammonium nitrate, thiab ammonium bicarbonate.
Urea tam sim no yog cov khoom siv nitrogen ntau tshaj plaws nrog cov ntsiab lus nitrogen siab tshaj plaws, nce mus txog 46%. Nws yog haum rau feem ntau cov qoob loo thiab hom av thiab muaj qhov zoo xws li ntev - cov teebmeem ntev, cia yooj yim, thiab kev thauj mus los.
Txawm li cas los xij, cov txheej txheem hloov pauv ntawm urea hauv cov av yuav siv sijhawm, thiab nws yooj yim nqus dej noo thiab clumping nyob rau hauv qhov chaw siab, uas yuav cuam tshuam rau nws cov txiaj ntsig fertilization. Ammonium sulfate, ntawm qhov tod tes, yog cov chiv chiv uas muaj nitrogen thiab sulfur. Nws muaj kwv yees li 20% -21% nitrogen thiab txog 24% sulfur, ua rau nws xaiv zoo rau cov qoob loo uas xav tau cov sulfur. Ammonium sulfate muaj cov nyhuv fertilizing sai thiab haum rau topdressing, tshwj xeeb tshaj yog nyob rau hauv alkaline xau, qhov twg nws acidic zog pab neutralize av alkalinity thiab txhim kho cov av ib puag ncig. Ammonium chloride muaj kwv yees li 25% nitrogen thiab 60% chlorine, ua rau nws tsim nyog rau cov qoob loo uas xav tau cov tshuaj chlorine, xws li mov thiab nplej.
Txawm li cas los xij, ammonium chloride yuav tsum tsis txhob siv rau chlorine - cov qoob loo rhiab heev, xws li haus luam yeeb thiab txiv hmab txiv ntoo, kom tsis txhob muaj kev puas tsuaj. Ammonium nitrate muaj kwv yees li 34% -35% nitrogen thiab muaj cov nyhuv fertilizing sai, haum rau cov qoob loo loj hlob theem uas xav tau nitrogen sai. Txawm li cas los xij, ammonium nitrate yog flammable thiab tawg, yuav tsum tau nruj me ntsis kev nyab xeeb kev ntsuas thaum lub sij hawm cia thiab tsheb thauj mus los, uas txwv nws daim ntawv thov rau qee yam. Ammonium bicarbonate muaj kwv yees li 17% nitrogen. Txawm hais tias nws cov ntsiab lus nitrogen tsawg, nws pheej yig thiab muaj cov nyhuv fertilizing sai, ua rau nws tsim nyog rau topdressing. Txawm li cas los xij, ammonium bicarbonate yog qhov yooj yim rau volatilization thiab nitrogen poob.
Yog li ntawd, nws yog tsim nyog los npog cov av tam sim ntawd tom qab fertilization kom txo tau nitrogen. Thaum xaiv nitrogen chiv, ntxiv rau kev txiav txim siab txog hom thiab cov yam ntxwv ntawm cov chiv nitrogen, nws tseem yuav tsum tau ua tib zoo xav txog yam xws li cov qoob loo xav tau, av, thiab txoj kev fertilization. Piv txwv li, rau cov qoob loo uas xav tau nitrogen siab, xws li pob kws thiab nplej, urea lossis ammonium nitrate, uas muaj cov ntsiab lus nitrogen siab, yog cov kev xaiv zoo; rau cov qoob loo uas xav tau cov sulfur, ammonium sulfate yog ib qho kev xaiv zoo; Thaum rau cov tshuaj chlorine- cov qoob loo rhiab heev, ammonium chloride yuav tsum raug zam. Tsis tas li ntawd, txoj kev fertilization kuj cuam tshuam rau kev xaiv ntawm nitrogen chiv. Piv txwv li, rau kev hnav khaub ncaws sab saum toj, ceev ceev - ua yeeb yam ammonium sulfate lossis ammonium bicarbonate yuav tsim nyog dua; thaum rau basal chiv, ntev -ua yeeb yam urea tej zaum yuav zoo tagnrho.
Nyob rau tib lub sijhawm, av tej yam kev mob kuj yog ib qho tseem ceeb uas yuav tau xav txog thaum xaiv nitrogen chiv. Piv txwv li, nyob rau hauv alkaline av, acidic zog ntawm ammonium sulfate pab neutralize cov av alkalinity; Thaum nyob hauv cov av acidic, alkaline lossis nruab nrab nitrogen chiv yuav tsum tau xaiv kom tsis txhob muaj av acidification.
