process for the manufacture of a liquid fertiliser azotatoad high stability and controlled release of nitrogen and fertilizan

摘要

The present invention relates to a method for making a highly-stable liquid nitrogenous fertilizer for controllably releasing Nitrogen, comprising the steps of successively mixing a Formaldehyde aqueous solution with formaldehyde contents from 36% to 43%, de-ironed water, a low alkalinity neutral buffer, Urea, solution Ammonia in a rate from 20% to 50%, boiling the mixture for evaporating off water up to achieve desired rate contents, and cooling the mixture.