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在洱海北部农田采集了422个耕作层土壤(0~30 cm)样品,测试分析了土壤全氮、有效氮、有机质含量及分析其相互关系,结合多点基础地力试验结果,分析了土壤不同碳、氮含量与当季作物产量的相应关系。结果表明:洱海北部区域农田土壤全氮和有机质含量非常丰富,全氮含量主要分布于2.0~4.5 g kg-1之间,平均含量达到3.3 g kg-1,土壤氮主要为有机态氮为主;土壤有机质含量主要分布于40.0~70.0 g kg-1之间,平均含量达到56.3 g kg-1。作物相对产量与土壤全氮和有机质含量呈显著正相关,当土壤全氮含量达到3.0 g kg-1或有机质含量达到56.0 g kg-1以上时,不施氮条件下,水稻作物产量可以达到稳产。
A total of 422 cultivated soils (0 ~ 30 cm) were collected from farmland in northern Erhai Lake. The contents of soil total nitrogen, available nitrogen and organic matter were analyzed and analyzed. Based on the multi-point foundation soil test results, the soil carbon , Nitrogen content and the corresponding crop yield. The results showed that the contents of total nitrogen and organic matter in the farmland in northern Erhai Lake were very rich. The total nitrogen content was mainly distributed in the range of 2.0-4.5 g kg-1 with the average content of 3.3 g kg-1. The main soil nitrogen was organic nitrogen The content of soil organic matter mainly distributed between 40.0-70.0 g kg-1 with the average content of 56.3 g kg-1. There was a significant positive correlation between crop relative yield and soil total nitrogen and organic matter content. When soil total nitrogen content reached 3.0 g kg-1 or organic matter content reached above 56.0 g kg-1, the crop yield could reach stable under no nitrogen application .