OBTAINING HUMATE-, NITROGEN AND MOLYBDENUM-CONTAINING LIQUID ORGANOMINERAL FERTILIZERS

Abstract

Introduction. The presence of humic substances (HS) and microelements in liquid organomineral fertilizers (LOMF) makes it possible to balance the mineral nutrition of plants and thereby increase the agricultural crops yield. The use of such fertilizers significantly increases the efficiency and reduces the costs of using mineral fertilizers. The aim of this work is to study the patterns of new types LOMF obtaining process, including macro- and microelements and physiologically active humic substances, and its composition and properties. Methods. Chemical analysis, inductively coupled plasma atomic emission spectrometer, infrared spectroscopy. Results and discussion. The processes of synthesis of LOMF through the interaction of sodium humate and ammonium heptamolybdate tetrahydrate were studied. Analysis of obtained results showed the same nature of the composition dependence and properties of the obtained LOMF on time. It was found that increasing the time from 10 to 120 min leads to an increase in the yield of humic acids (HA^daf) to 40.08%, the N content to 4.62% and Mo to 0.17%, the amount of COOH to 1.80 mg-eq/g and OH_phen. groups – up to 0.71 mg-eq/g. It has been shown that with an increase in S:L ratio from 0.3:100 to 0.7:100, the HA^daf decreases to 36.97%, and the N and Mo contents increase, respectively, to 6.0 and 0.37%. Conclusion. The regularities of the time influence and S:L ratios on the composition and properties of LOMF samples have been established. It has been shown that an increase in time and S:L ratio contributes to an increase in the content of N and Mo, the carboxyl and phenolic hydroxyl groups. The changes in these parameters have different effects on the HA^daf. The presence of HS, N, Mo, COOH and OHphen groups in the resulting products allows them to be used in agriculture and for restoring soil fertility.