一九七七年以来,我们在豫东“砂土综合利用与改良”的试验研究中,发现砂区土壤速效钾含量较低,缺钾有潜在的可能性。为在砂区推广使用钾肥提供依据,进行了一些探讨性试验,初步证明小麦施用钾肥有较明显的效果,现整理于下,仅供参考。砂土速效钾含量及其与代换量的关系土壤速效钾含量是土壤供钾水平的指标之一,在很大程度上是影响钾肥肥效的首要因素。为此,我们测定分析了豫东砂土的速效钾含量,结果如表一。 Since 1977, in the pilot study on “comprehensive utilization and improvement of sandy soil” in the eastern part of Henan Province, we found that there is a potential for low available potassium and potassium deficiency in sandy soils. In order to promote the use of potash in the sand area to provide the basis for a number of exploratory experiments conducted initially proved that the application of potassium fertilizer has a more obvious effect, are now sorted, for reference purposes only. Soil available potassium content and its relationship with the substitution rate Soil available potassium content is one of the indicators of soil potassium supply, to a large extent, is the primary factor affecting the fertilizer efficiency. To this end, we measured and analyzed the available potassium content of eastern Henan sand, the results shown in Table 1.