O le sodium o-nitrophenolate e mafai ona faʻaaogaina e avea o se mea e faʻaogaina ai le toto, lea e mafai ona vave ulu i totonu o le tino o le laau, faʻaleleia le tafe o le protoplasm cell, ma faʻavaveina le saoasaoa o le aʻa o laau.

O ituaiga autu o aʻa o laʻau ma aʻa faʻalauteleina e aofia ai le chlorformamide ma le choline chloride/naphthyl acetic acid.

Choline chloride o se faʻatonuga faʻatupulaia laau faʻapipiʻi e mafai ona faʻalauteleina le vave faʻalauteleina o aʻa lalo o le eleele ma tubers, faʻaleleia le fua ma le lelei. . E mafai foʻi ona faʻatonutonu le photosynthesis o laulaʻau ma faʻalavelaveina le photorespiration, ma faʻateleina ai le faʻalauteleina o fatu i lalo o le eleele.

O faʻatonuga o le tuputupu aʻe o laʻau e faʻamalosia ai le vave matua o laʻau e aofia ai ituaiga nei: Gibberellic Acid (GA3): Gibberellic Acid o se faʻatonuga o le tuputupu aʻe o laʻau lautele e mafai ona faʻaleleia le tuputupu aʻe ma le atinaʻeina o fualaʻau, faʻatupuina vave, faʻateleina fua, ma faaleleia tulaga lelei. E talafeagai mo fualaʻau e pei o le cotton, tamato, fualaau aina, pateta, saito, soya, tapaa, ma araisa‌.

O le a'a o la'au o se tasi lea o vaega taua o le tuputupu a'e o laau ma e taua tele i le tuputupu a'e, atina'e ma le toe gaosia o laau. O le mea lea, o le faʻafefea ona faʻaleleia le aʻa o laʻau o se mataupu taua i le totoina o laau. O lenei tusiga o le a talanoaina pe faʻafefea ona faʻaleleia le aʻa o laʻau mai itu o tulaga o meaʻai, mea tau le siosiomaga, ma metotia togafitiga.