武汉市蔬菜基地土壤钾素供应能力的研究

STUDIES ON THE POTASSIUM SUPPLYING POWER OF SOIL FROM IMPORTANT VEGETABLE BASE IN WUHAN

应用化学、物理分析方法,并结合盆栽试验,从土壤速效钾含量,缓效钾含量及其释放速率,优势含钾矿物的种类及其对土壤钾的贡献,以及作物吸收利用等方面,综合评价了武汉市蔬菜地土壤供钾能力。结果表明:由汉江冲积物发育的灰正土供钾能力最强,其供钾潜力大于长江冲积物发育的灰油砂土和Q_3发育的白散土。白散土供钾状况,近期内优于灰油砂土,但从长期考虑,其供钾潜力则接近或稍优于白散土。

The K-supplying power of soil from important vegetable base in Wuhan was eva-luated comprehensively by means of the chemical and physical analysis and pot expert-ments. The following attributes of the soils were tested: quantity of available potassium,content of slow available soil potassium and its release rate, main kinds of potassium-bearing minerals and its contribution to crop potassium nutrition, crops absorbed pota-ssium. Three soil samples were taken from each of calcareous silt-loamy alluvial soil(A), calcareous sandy-loamy alluvial soil (B) and slight leached silt-loamy yellowbrown earth(C),which were developed from Hangjiang River alluvial, ChangjiangRiver alluvial and Q_3 parent material, respectively. The results showed that the K-supplying power of A was the highest。C was be-tter than B in the short period. But, with regard to the long-term effect, the K-supplying power of B was close or slightly superior to C.