论文部分内容阅读
综合全省８个１０年以上定位试验得出：当前江西稻田化肥肥效是氮＞钾＞磷，并明确氮肥、磷肥、钾肥和有机肥在不同土壤类型具有不同肥效；在等养分氮磷钾条件下，其肥效以有机无机配施＞单施氮磷钾化肥＞单施有机肥，并研究了连续施用的增产效果和对稻田肥力的影响。在氮磷钾化肥基础上，加施有机肥，在双季稻连作条件下，产量和土壤肥力一般不降低；连续施用同种肥料条件下，１０年不施磷肥或钾肥，土壤速效磷、钾含量明显下降；连续施用有机肥或氮磷钾化肥及其配施，均不能补充硼的需要，但能提高锌的供给；连续施用过磷酸钙，９年后表现潜在缺硅、缺镁的可能；而连续施用钙镁磷肥，促使耕层有效钙、镁、硅含量增加，硫的含量相对减少。土壤有机质年均下降率及提高率，一般与本底土壤有机质含量呈负相关
Based on the experiment of more than 10 years in the province, the results showed that: the current fertilizer efficiency of paddy field in Jiangxi is nitrogen> potassium> phosphorus, and it is clear that nitrogen, phosphorus, potassium and organic fertilizers have different fertilizer efficiencies in different soil types; Under the application of organic and inorganic fertilizers> NPK fertilizers> single organic fertilizers, the effects of continuous application on yield increase and fertility of paddy fields were studied. On the basis of NPK fertilizers, applying organic fertilizers did not reduce the yield and soil fertility under the continuous cropping condition of double cropping rice. Under the condition of continuous application of the same fertilizers for 10 years, there was no application of P or K fertilizer, available P and K The content decreased significantly. The continuous application of organic manure or NPK fertilizer and its combination could not supplement the need of boron, but could increase the supply of zinc. The continuous application of superphosphate could manifest potential silicon deficiency and magnesium deficiency after 9 years While the continuous application of Ca, Mg and P fertilizers promoted the increase of available Ca, Mg and Si contents in plow layer and decreased the content of sulfur. Soil organic matter annual average rate of decline and improvement, generally with the background soil organic matter content was negatively correlated