Organic Fertilizer Through Composting Cattle Manure With The Addition Of Phosphogypsum
In the article given the results of studying the processes of obtaining organic fertilizers by composting cattle manure (cattle) with the addition of phosphogypsum with mass ratios of cattle manure: phosphogypsum = 100: (5-30). It is shown that due to the addition of phosphogypsum to cattle manure in composts, the degree of conversion of the organic part of manure to humic substances increases from 54.44% to 64.63%, the loss of nitrogen and organic substances decreases from 28.92% to 6.75% and from 23.48% to 7.22%, respectively. It was also determined that as a result of the interaction of phosphogypsum with ammonium salts of humic acids and other organic acids, ammonium sulfate and calcium humate are formed in composts, that is a certain amount of phosphogypsum and humic acids are converted to ammonium sulfate and calcium humate. Under optimal conditions, when the ratio of cattle manure: phosphogypsum = 100: 10 after 90 days, the relative content of the water-soluble form of SO3 increases from the initial 29.03% to 62.41% and the relative content of the water-soluble form of CaO decreases from 45.08% to 28.70%.