摘要
钾肥肥效和需钾程度,主要决定于土壤钾素供应水平;土壤供钾潜力与成土母质及其风化程度密切相关。本项研究主要对我省几种主要成土母质发育的红壤性水稻土,在不施钾的条件下,进行生物耗竭盆栽试验,以探明其钾素供应潜力和土壤钾的动态消长,为合理利用钾肥,改革施肥结构提供科学依据。
The K supply ability of the soil is closely related with the soil matrix and its degree of weathering.Experiment of biological exhaustion showed that the potentiali ties of K supply of paddy soils derived from red earth,which developed from different matrices were granite>red clay>limestone>red sandstone.The K supply ability of paddy soil from red earth developed from red clay with different intensity of weathering increased with the increase of macturity of the clay.The consumption of K by rice in the high and middle yielding fields were 43.87%and 24.84%higher than that in the low yielding fields.It indicated that the paddy soil with high fertility also should be supplied with K for a continuous high yield.In the process of continuous exhaustion the accumulated dry matter of buckwheat significantly decreased and the contents of available K and slowly released K rapidly reduced indicating the potentiality of K supply in the paddy soil derived from red earfh was low.
作者
赖庆旺
李茶苟
Lai Qingwang;Li Chageu(The Red Earth Research Institute of Jiangxi Province)
出处
《中国农业科学》
1986年第3期45-50,共6页
Scientia Agricultura Sinica
