Minimizing nitrate losses from arable soils

摘要: . Recent experiments on soils overlying sand, chalk and limestone aquifers have shown that nitrate leaching losses can be decreased by modifying crop husbandry. Green cover during winter, if established early enough, reduce loss. Cultivations timed to minimize leaching, the advantages of irrigation (increased nitrogen offtake smaller post-harvest soil mineral residues) outweigh potential disadvantage increased risk growing season. It is important not over-fertilize crops. Using these techniques within farm rotations has in small plot experiments. The next step measure effects commercial farms where scale operation might preclude high level husbandry required for successful management.