关键词: 氮肥利用率, 氮肥利用率

Abstract:

The article took and tested 62 samples of top soil (0-20 cm) from potato growing areas in Wuxi and Chengkou of Chongqing for learning the status about potato soil nutrient. The results showed that, the soil pH was unsuitable for growing potato as overall alkaline. The soil organic matter was rich, where the content over 20 g/kg took up 80.6% and there was 17.7% soil over 40 g/kg. The rate of soil total nitrogen and total phosphorus were high respectively and total potassium nearly a half of the whole samples was moderate, the ratio of richness and lack were 24.2% and 30.6%. As for one area, the contents of total phosphorus and total potassium were both serious lack reached 35.3% and 50% in Wuxi. The results also indicated that, the content of soil available N, P, K and S were all in rich levels and the exchanged Ca and Mg were both extremely rich. The standard of soil available S was generally low in Chengkou. In terms of the micro-nutrients, the deficiency rate of available Fe, Mn and B was 48.4%, 56.4% and 98.4%, respectively. However, the rate of available Cu and Zn were both very rich. All the micro-nutrients were higher in Chengkou. Soil nutrient classifications differed significantly at different positions and different region by the experiment.