Behavior and Fate of Animal Waste Nitrogen and Soluble Ions in the Agricultural Environment with Particular Reference to Rice. Part of a Coordinated Programme on Agricultural Nitrogen Residues with Particular Reference to Their Conservation as Fertilizers and Behavior as Potential Pollutants. Final Report for the Period 1 October 1973--31 October 1976

摘要

The fate of residual nitrogen and its fertilizer efficiency following application to rice plants in pots under controlled laboratory conditions have been studied. Nitrogen was applied as exp 15 N labelled fecal waste from goat and hog, and as chemical fertilizer (ammonium sulphate) respectively. Animal waste nitrogen was less effective than ammonium sulphate nitrogen in terms of rice yield. On the other hand residual nitrogen in the high soil layers was much higher for the organic nitrogen application and there appeared to be lower losses by volatilization (20-30% for animal waste N, 30-40% for ammonium sulphate nitrogen). Leaching losses were minimal and similar for both kinds of N-application (ca. 1%). Similar results were obtained under field conditions with alluvial, and ''sandy'' soils respectively. Plant recovery of N was greater from ammonium sulphate than from animal waste but overall losses in total balance studies appeared greater for N applied as ammonium sulphate under otherwise comparable conditions (30-40% of N applied as ammonium sulphate and 19-32% of N applied as fecal waste). (Atomindex citation 08:347045)