论文部分内容阅读
对江西省余江县28个典型田块的调查结果显示,余江县稻田土壤以粉砂壤土和壤土为主,土壤pH值在4.78～5.37之间,属酸性土壤。参照第二次全国土壤普查分级标准,余江县稻田土壤有机质、全氮、碱解氮和速效磷含量丰富,但速效钾含量处于中等水平,少量田块还存在钾素缺乏的现象。2006～2008年28个定位田块平均年产量为12736 kg hm-2。主成分分析结果表明,影响当地水稻产量的主要土壤肥力因素是土壤有机质、全氮和碱解氮,速效钾的影响次之,再次是速效磷。因此,高度集约农业条件下土壤肥力指标值得进一步探讨;余江县在水稻生产过程中要加强有机肥的施用,增加钾肥施用,并适当减少磷肥的施用量。
The survey results of 28 typical plots in Yujiang County, Jiangxi Province show that the paddy soil in Yujiang County is dominated by silty loam soil and loamy soil, and the soil pH value is between 4.78 and 5.37, which is an acidic soil. According to the Second National Soil Census Grading Standard, the contents of soil organic matter, total nitrogen, available nitrogen and available phosphorus in paddy soil of Yujiang were rich, but the content of available potassium was at medium level. From 2006 to 2008, the average annual output of 28 locating plots was 12736 kg hm-2. The results of principal component analysis showed that the main soil fertility factors that affected the local rice yield were soil organic matter, total nitrogen and available nitrogen. The available potassium was second, and the available phosphorus was again. Therefore, the indicators of soil fertility under highly intensive agricultural conditions deserve further exploration. In the process of rice production, Yujiang County should strengthen the application of organic fertilizers, increase the application of potash fertilizer and reduce the application of phosphate fertilizer appropriately.