有机稻鸭共作对土壤养分动态变化和经济效益的影响

土壤养分供应与作物需求间的矛盾是影响有机种植作物产量的技术瓶颈之一。试验通过对常规稻田、转换期稻鸭共作稻田和有机稻鸭共作稻田3种不同种植模式的土壤定位监测,分析土壤基本养分在水稻不同生长阶段的动态变化。结果表明,有机稻鸭共作稻田土壤有机质、碱解氮、速效磷和速效钾等养分指标在整个水稻生长期基本能维持一个相对稳定的状态,在幼穗分化期速效钾含量高于常规稻田,在成熟期碱解氮、速效磷和速效钾含量都远高于常规稻田。有机稻鸭共作稻田水稻产量较常规稻田有所降低,由于有机稻米的价格远高于常规稻米,实际经济效益可观,是值得推广的种植模式。

Effect of integrated organic duck-rice farming on the dynamics of soil nutrient and associated economic benefits

Conflict between soil nutrient supply and crop demand is one of the technical bottlenecks influencing organic crop production. In this study, certain nutrients were monitored during crop growth in soil samples from conventional paddy fields, transformed paddy fields and organic duck-rice farming fields. Based on the study, organic matter, alkali-hydrolysis N, available P and available K contents in organic duck-rice farming fields are relatively stable. Available K is much higher in organic duck-rice farming fields than in conventional paddy fields at panicle stage, while alkali-hydrolysis N, available P and available K contents are much higher in organic duck-rice farming fields at mature stage. Organic rice yield is lower than conventional rice whereas the price of organic rice is much higher than conventional rice - which has a considerable economic benefit. Based on the study, integrated organic duck-rice farming should be promoted.