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

Figure 6

Cumulative NH₄-N (mg NH₄-N per manure storage unit) leached from manure of the dry season storage experiment. Error bars represent standard error of the mean values. Continuous lines represent best-fit regression equations for cumulative NH₄-N (mg) leached from manure during the dry season experiment. 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. 𝑌 represents the cumulative NH₄-N (mg) leached from the manure. Medium quality manure, no urine: 𝑌=18.3144ln(𝑥), 𝑅²=0.989. Medium quality manure, with urine: 𝑌=41.1785ln(𝑥), 𝑅²=0.993. Low quality manure, no urine: 𝑌=7.1964ln(𝑥), 𝑅²=0.988. Low quality manure, with urine: 𝑌=30.5345ln(𝑥), 𝑅²=0.994. The rate equations for leachate NH₄-N between the four treatments did not differ at significance level α = 0.05.