The Effects of Some External Management Factors on the Nitrogen Composition of Cattle Manure on Smallholder Farms

Figure 2

NH₄-N dynamics in manure of the dry season storage experiment. Error bars represent standard error of the mean values. Continuous lines represent the best-fit regression equations for NH₄-N dynamics in manure during the dry season experiment. 𝑌 represents the amount of NH₄-N (mg/kg manure DM) in the manure. The solid line (—) represents the Medium quality manure, no urine treatment. The dashed line (- - - -) represents the urine-amended Medium quality manure treatment. The dotted line (. . . .) represents the Low quality manure, no urine treatment. The dot-dash line (-··-··) represents the urine-amended Low quality manure treatment. Medium quality manure, no urine: 𝑌=462.3𝑒^{−0.0180𝑥}, 𝑅²=0.807. Medium quality manure, with urine: 𝑌=621.8𝑒^{−0.0232𝑥}, 𝑅²=0.619. Low quality manure, no urine: 𝑌=249.1𝑒^{−0.00955𝑥}, 𝑅²=0.715. Low quality manure, with urine: 𝑌=1033.7𝑒^{−0.0570𝑥}, 𝑅²=0.812. The rate equations for NH₄-N dynamics between the manure sources did not differ at significance level α = 0.05.