【摘要】 <正> 钾是大豆生长发育所必需的重要营养元素之一,其作用如何?尚不十分清楚。因此从1980年开始,在所内及宁陵县北刘农科站进行了盆栽试验,在新郑、宁陵、郑州市郊、泌阳、驻马店镇、遂平、项城等基点进行了一系列的田间试验。通过试验,初步明确了钾肥对大豆的增产效果与施用技术,为推广使用钾肥提供科学依据。更多还原

【Abstract】 The yield of soybean was increased by applying potassium fertilizer when the content of exchangeable potassium in the soil was below 110 ppm and an optimum rate of nitrogenous and phosphorus fertilizers was also applied. The increase in grain yield ranged from 16 to 40 kg per mu, and an increase of 1.3 to 4,2 kg of soybean per 1 kg potassium fertilizer applied, by applying 10 kg of it as basal dressing and top-dressing in early stage of seedling.Potassium fertilizer not only increased the yield of soybean, but also improved its quality.更多还原