Nitrogen leaching and crop availability in manured catch crop systems in Sweden
作者： Gunnar Torstensson , Helena Aronsson
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摘要: Results are presented from five years (1990–1995) of a field leaching experiment on sandy soil in south-west Sweden. The aim was to study N leaching, change organic and mineralization cropping systems with continuous use liquid manure (two application rates) catch crops. drains, uptake crops mineral the were measured. Simulation models used calculate budget make predictions improved fertilization strategies relation applications changing time for incorporation In treatments without crops, normal double increased average by 15 34%, respectively, compared treatment commercial fertilizer. Catch reduced by, average, 60% fertilizer, but only 35% rate manure. Incorporation spring simulated net during crop vegetation period, also early autumn. conclusion, manured resulted larger than those receiving mainly due spring. More careful adaptation respect amounts NH4-N applied could, according simulations, reduce leaching. Under-sown ryegrass effectively systems. Incorporating residues late autumn instead might be preferable availability next crop, would not increase
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