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

Figure 5

Total organic N, neutral detergent insoluble N (NDIN), and acid detergent insoluble N (ADIN) dynamics in manure in the rainy season experiment (DM basis). Error bars represent standard error of means. Continuous lines represent regression equations for organic N dynamics in manure during the rainy season experiment. Solid lines (—) represent the best fit regression lines for Medium quality manure treatments. Dashed lines (- - - -) represent the best fit regression lines for Low quality manure treatments. 𝑌 represents the amount of organic N, NDIN, or ADIN remaining in the manure (% of initial content, DM basis). (a) Total organic N dynamics (%N, DM basis). Medium quality manure: 𝑌=100𝑒^0.00174𝑥, 𝑅²=0.989. Low quality manure: 𝑌=100𝑒^0.00576𝑥, 𝑅²=0.986. The rate equations for organic N dynamics between the two manure sources did not differ at significance level α = 0.05. (b) Neutral detergent insoluble N dynamics (%NDIN, DM basis). Medium quality manure: 𝑌=100𝑒^0.00478𝑥, 𝑅²=0.984. Low quality manure: 𝑌=100𝑒^0.0112𝑥, 𝑅²=0.973. The rate equations for NDIN dynamics between the two treatments did not differ at significance level α = 0.05. (c) Acid detergent insoluble N dynamics (%ADIN, DM basis). Medium quality manure: 𝑌=100𝑒^0.00578𝑥, 𝑅²=0.974. Low quality manure: 𝑌=100𝑒^0.00394𝑥, 𝑅²=0.973. The rate equations for ADIN dynamics between the two treatments did not differ at significance level α = 0.05.

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