摘要
利用盆栽试验研究紫色母岩风化物供钾能力。结果表明:紫色母岩母质肥力较高,籽粒苋的耗钾过程中,紫色母岩风化物各钾素形态逐渐降低,不施钾处理比施钾处理降低更快。籽粒苋吸钾量与其生物量有一定的相关性,不施钾处理r2=0 9584 ,回归方程为y=3 24+16 866x。施钾处理r2=0 9604 ,回归方程为y=2 36+17 43x。籽粒苋钾素活化率顺序与其速效钾含量高低顺序一致。因此,可以用植物对土壤钾素的活化率和籽粒苋吸钾总量来评价紫色土的供钾能力。
Pot observation and experiments were conducted to study K supplying potential of weathering products developed from the purplish rocks.Results showed that fertility of weathered material of purplish rocks was relatively high.Potassium forms of weathered products reduced gradually with potassium absorbed by Grain amaranth.Comparing potassium reduction with K-fertilizer application,non-fertilizer application fell faster than the former.K absorbed by Grain amaranth was related with its biomass with correlative...
出处
《西南农业学报》
CSCD
2003年第S1期94-97,共4页
Southwest China Journal of Agricultural Sciences
基金
中国科学院知识创新重大项目(KZCX2-413)
四川省青年科技基金
关键词
供钾能力
作物对土壤钾素活化率
钾素形态
紫色母岩风化物
K supplying power
mobilization rate of soil reserve K
K forms
weathering matters developed from purplish rocks
