Urea o se faʻaputuga fualaʻau e masani ona manaʻomia faʻapipiʻi. O lona autu o le aua le tuʻuina ni mea leaga i totonu o le palapala, ma o le umi-taimi faʻaoga e leai ni aafiaga leaga. I alamanuia, suavai amonia ma carbon dioxide o loʻo faʻaaogaina o mea masani e tuusaʻo synthesizeurea lalo o le maualuga vevela ma maualuga tulaga o le mamafa. I se faʻaopopoga i le faʻaaogaina o se vailaʻau faʻafefiloi vailaʻau,urea mafai foi ona faʻaaogaina i tele aofaʻiga mo isi vailaʻau vailaʻau, vailaʻau, meaʻai, vali vali, solofanua susu, ma viscose fibre faʻalauteleina, Resin maeʻa soʻosoʻo, diesel afi faʻaalu kasa kesi togafitiga suavai ma isi gaosiga mea.

Lapataiga i le faʻaaogaina o urea:

1. Urea e talafeagai mo faʻavae faʻalaʻau ma laʻei pito i luga, ma o nisi taimi e fai ma faʻalaʻau fatu. E talafeagai mo faʻatoʻaga uma ma eleele uma. E mafai ona faʻaaogaina o ni mea faʻavae fetilaisa ma pito i luga ofu. E mafai ona faʻaaogaina i toga mago. I eleele alkaline poʻo alkaline eleele,urea ua hydrolyzed e faatupuina nitroni amonium, ma luga apalai o le a mafua ai le amonia volatilization, ina loloto loloto ufitia palapala tatau ona faʻaaogaina.

2. A maeʻa urea ua faʻapipiʻi luga o le fanua paddy, o le amonia volatilization ina ua maeʻa hydrolysis o 10% -30%. I eleele alkaline, o le nitrogen leiloa e amonia volatilization o 12% -60%. Lalo o le maualuga vevela ma maualuga sūsū, le amonia volatilization ourea mafai ona susunuina laau ma faʻatelevave le fua faatatau nitrification. O le mea lea, e taua tele le apalaiurea loloto ma faʻaaoga le vai e ave ai fetilaisa.

3. Aua urea mafai faʻaputuputu se tele aofaʻiga o amoniumoni ioni i le palapala, o le a faʻateleina ai le pH e 2-3 iunite. I le male,urea lava ia aofia ai se aofaʻi aofaʻi o biuret. A o lona faʻatumauina o 500ppm, o le a aʻafia ai faʻatoaga. Roots ma sprouts ei ai faʻalavelave faʻalavelave, o leaurea e le faigofie ona faʻaaogaina o le fetilaisa o fatu, fetilaisa o laʻau ma le fetilaisa foliar. O leurea anotusi i isi taimi faʻaoga e le tatau ona soʻona tele pe faʻamaopoopo. Ina ua maeʻa le totoina laʻau fualaʻau na faʻaleagaina e le biuret, o le chlorophyll synthesis papupuni na fausiaina, ma o laula foliga mai chlorosis, samasama samasama ma e oo lava i le faʻapaʻepaʻeina o fasi poʻo taʻifa.

4. Urea e le mafai ona fefiloi ma fetilaisa alkaline. Ina ua maeʻaurea ua faʻaogaina, e tatau ona liua i le ammonium nitrogen ae le i mafai ona faʻaaogaina e faʻatoʻaga. I lalo o tulaga alkaline, o le tele o le nitrogen i le ammonium nitrogen o le a avea ma amonia ma volatilize. O lea,urea e le mafai ona tuʻufaʻatasia ma laʻau lefulefu, kalisiu magnesium phosphate faʻalaisa, carbon Faʻafefiloi poʻo le tuʻufaʻatasia o le alkaline fertilizers pei o le ammonium.

O le a le iʻuga o urea i le totoina o laau ma faʻafefea ona faʻaaogaina?

1. O le matafaioi a urea o le fetuunai o le aofaʻi o fugalaʻau. 5-6 vaiaso pe a maeʻa fuga, spray 0.5%urea vai fofo luga o le laualuga luga mo le 2 taimi, lea e mafai ona faʻateleina ai le nitrogen anotusi o laʻau, faʻatelevaveina le tuputupu aʻe o laʻau fou, taofia le faʻavasegaina o fuga fugalaʻau, ma faia le O le fugalaʻau aofaʻi tele e talafeagai.

2. Faamuamua fua o faʻatoʻaga. A faʻaoga, o faʻatoʻaga ma tele laufanua totoina ma maualuga tau tamaoaiga (pei o saito ma sana) e tatau ona muamua mafaufau. Mo faʻatoʻaga tulaga lua pei o buckwheat, oe mafai ona faʻaaoga laititi talosaga e tusa ai ma lou oe tulaga tamaoaiga. Pe le faʻaogaina foi, ma matua taʻalo i le aʻafiaga o le fetilaisa i le faʻateleina o gaosiga. Faʻaaoga o ni faʻavae faʻalautele poʻo ni ofu i luga.Urea e talafeagai mo le faʻaaogaina o faʻavae faʻalautele ma laʻei pito i luga. E masani lava, e le faʻaaogaina o ni fetilaisa mo fatu.

3. Talosaga muamua. Ina ua maeʻaurea e faʻaoga i le palapala, e muamua hydrolyzed i le ammonium bicarbonate e le gaioiga o le eleele microorganisms ae le i mafai ona mitiia e faʻaputuputu aʻa. O le mea lea, e tatau ona faʻaaoga muamua. Apalaiurea a maeʻa le timu i le mea sili e mafai ona iai le lelei faʻatumuina o le susū susu. A faʻapipiʻi le eleele i luga o le eleele matutu, taumafai e faʻatulaga pe a maeʻa le timu ina ia mafai ai ona faʻavaivaia le faʻalaʻeleʻele ma mitiia e le palapala.
4. Afai urea e teu lelei, o le a faigofie ona mitiia le susu ma faʻaputuputu, lea o le a aʻafia ai le muamua uiga o urea ma aumai ai maumau tupe maua i le aufaifaatoaga. O lenei e manaʻomia ai faifaʻatoʻaga e teuurea saʻo Ia mautinoa e tausi leurea afifiina ato maopoopo a o le i faʻaaogaina, tago ma le faʻaeteete i taimi o femalagaaiga, aloese mai le timu, ma teuina i se nofoaga matutu, lelei ea ma le vevela i lalo ifo o le 20 tikeri.

5. Afai o se aofaʻiga tele o teuina, faʻaaoga se sikuea laupapa e teu le pito i lalo pe a ma le 20 cm, ma tuʻu le avanoa e sili atu i le 50 cm i le va o le pito i luga vaega ma le taualuga e faʻafaigofie ea ma le susu, ma tuʻulafoa laina i le va o le faaputuga Ia faʻafaigofie asiasiga ma ea. Afai eurea ua tatalaina i totonu o le ato e le faʻaaogaina, o le ato tatalaina tatau ona faʻamaufaʻailogaina i le taimi e faʻafaigofie ai le faʻaaogaina i le tausaga fou.