Urea urea: daim ntawv thov

Txhua gardener sim los txhim kho qhov zoo ntawm lawv cov qoob loo, siv tag nrho cov xaiv ntawm chiv. Niaj hnub no, feem ntau yog cov carbamide (urea) uas muaj organic zaub thiab av as additives li zoo raws li nitrogen-nplua nuj.

Ib me ntsis keeb kwm

Thawj urea sab nyob rau hauv 1773 los ntawm Fabkis tus paub txog Hillaire Rouelle, tiam sis tsuas yog txij li thaum 1828 nws pib mus rau tsim synthetically. Pib nitrogen chiv carbamide (urea) nyob hauv cov ntshiab daim ntawv muaj txog li 46% ntawm nitrogen, yaj nyob rau hauv dej ntawm pH kuas thiab yog tsis lom rau cov nroj tsuag thiab cov av.

tso tawm daim ntawv

Urea (carbamide) yog ua nyob rau hauv ntau yam ntaub ntawv:

• Nyob rau hauv daim ntawv ntawm cov me me granules yaj maj mam nyob rau hauv cov av thiab tiv thaiv nws los ntawm kev tsuas xyaus ntawm nitrogen. Nws yog ib qho yooj yim rau yam nws nrog rau lwm cov chiv, xws li organic.
• Qhov ntev hauv daim ntawv ntawm soluble cov ntsiav tshuaj coated nrog ib tug tshwj xeeb daim nyias nyias, kev tiv thaiv los ntawm ceev ceev xaus nyob rau hauv cov av, uas tiv thaiv cov qoob loo ntawm cov av thiab nitration.

Carbamide: daim ntawv thov

Teb thwmsim qhia tias kev siv ntawm urea raws li ib tug pre-sowing chiv permissible txig rau tag nrho cov hom ntawm xau thiab nyob rau hauv tag nrho cov hom ntawm cov qoob loo. Thaum zoo li no kev kawm tsis yog ua tsis tau zoo txhais tau tias ntawm ammonium nitrate thiab ammonium sulfate, thiab tej zaum, piv txwv li, sod-podsolic xau nrog txaus noo noo thiab irrigated serozem, muaj ib tug richer qos qoob loo thiab zaub cov qoob loo. Siv raws li ib tug sab saum toj hnav khaub ncaws rau lub caij ntuj no cov qoob loo nyob rau hauv thaum ntxov caij nplooj ntoos hlav, thiab rau kab qoob loo thiab zaub tam sim ntawd yub los mus tiv thaiv nitrogen tsis los ntawm evaporation ntawm cov ammonia tsim thaum lub sij hawm decomposition ntawm chiv. Rau foliar nroj tsuag pom zoo crystalline variant biuret ntsiab lus mus rau 0.2-0.3%.

zoo

Qhov no nitrogen chiv muaj zoo dua lwm yam chiv. Urea (carbamide) yog zoo yaim haiv neeg, thiab thaum muaj kev kub concentration (1% tshuaj) tua nroj tsuag thiab tsis hlawv lub nplooj. Thaum lub expansion yog absorbed los ntawm cov nplooj hlwb li cov molecule, thiab muaj peev xwm kuj yuav absorbed los ntawm cov decomposition nyob rau hauv qhov kev txiav txim ntawm lub enzyme urease los yog ammonia tsim tau ib diamino voj transformations nitrogenous tshuaj. Txawm li cas los, ib tug dhau heev lawm ntawm free ammonia nyob rau hauv lub hauv paus cheeb tsam slows germination thiab ntoo, yog li ntawd koj yuav tsum tau heev muaj kuab nyob rau hauv ua lub urea rau cov av nyob rau ntawm lub sowing los yog tusyees faib nws.

tswv yim pom zoo

Ua ntej tas li ntawd ntawm urea rau cov av kom huv si pom zoo kom sib tov nrog lwm cov additives los yog nrog qhuav xuab zeb. Thaum siv kom yog yog, granular urea (carbamide) yog ib qho zoo heev nitrogen chiv. Tag nrho cov no yog ua tsaug rau lub cev zog li zoo raws li lub siab cov ntsiab lus ntawm nitrogen nyob rau hauv nws muaj pes tsawg leeg. Vim nws yog tej zaum yuav siv nyob rau hauv tej av, thiab nws muaj ib tug zoo ntxim rau cov qoob loo loj hlob, qhov yuav tsum tau rau qhov no universal chiv hlob nrog txhua lub caij, thiab raws li ib tug tshwm sim, nws cov yuav tsub kom.