Akuwona wonke ama-fertilizer asekelwe ku-phosphorus afanayo. Ngalesi sizathu, ukuqinisekisa ukudla okwanele kwe-phosphorus okufika ngesikhathi kumazambane kungaba nzima noma kubize kakhulu.
Uma ama-fertilizer amabili equkethe inani elifanayo le-phosphorus elemental, kodwa liqukethwe kumakhompiyutha ahlukene asabela ngendlela ehlukile enhlabathini, umanyolo ungahluka kakhulu ngokuthi kungakanani nokuthi yisiphi isigaba senkathi yokukhula esizotholakala ezitshalweni. Leli qiniso liyabakhungathekisa abalimi abaningi bamazambane futhi liholela emaphutheni avamile ekuvundiseni kwezitshalo.
Ukuqinisekisa ukuthi abalimi bathola lokho abakukhokhele ngokutshala imisoco yezitshalo, yonke imiquba emikhulu ye-phosphate yezentengiselwano ibhalwe ukuthi iphesenti le-phosphorus (P2O5) elitholakala ngempela ezitshalweni. I-Phosphorus etholakala ezitshalweni ibalwa ngokulinganisa ukuncibilika komanyolo we-phosphate emanzini kanye ne-ammonium citrate, i-asidi ebuthakathaka. Ilinganisa ama-asidi emvelo avela ngokwemvelo emhlabathini noma akhiqizwe izimpande zezitshalo.