论文部分内容阅读
对仪征市典型土壤冷硝酸提取的钾和醋酸核提取的钾进行比较分析，归纳出两种钾之间的三种相关型以及相对应的土壤。通过进一步研究发现质地是影响有效钾含量高低的主要因子。田间试验结果表明钾肥在水稻上的施用效果与有效钾的相关性优于速效钾。可见用有效钾作为土壤钾素诊断指标比速效钾更好。根据有效钾与速效钾以及质地的关系，本文提出简易推广方案：轻壤—中壤速效钾含量在１０（ｍｇ／ｋｇ以下，重壤—轻粘速效钾含量在７５ｍｇ／ｋｇ以下应普施钾肥。
The potassium extracted from the cold nitric acid extracted from the typical soil in Yizheng was compared with the potassium extracted from the acetic acid nucleus, and the three related types of the two potassium and the corresponding soils were summarized. Through further research found that texture is the main factor affecting the level of available potassium. The results of field trials showed that potassium application in rice was more effective than available potassium in comparison with available potassium. Visible potassium as a soil potassium diagnostic index better than potassium. According to the relationship between available potassium and available potassium and texture, this paper presents a simple promotion scheme: the content of available potassium in the light-medium-medium soil is below 10 (mg / kg, potassium is below 75mg / kg in the heavy- .