摘要
化肥与盐土盐分以 0 .0 5%与 1.0 0 %浓度施入土壤 ,使同一浓度的溶质势相近 ;而1.0 0 %浓度比 0 .0 5%浓度的溶质势可增高约 3倍。表明化肥与盐土主要含盐成分的化学性质虽有不同 ,但对溶质势的影响一致。在化肥采用全层施、穴施、底施、表施等不同施肥方法时 ,溶质势有差异 ,结果为全层施 >穴施 >底施 >表施 ,似可说明全层施在土壤中分布均匀 ,溶质势增强快。化肥穴施时 ,愈近施肥点则溶质势愈高 ,影响范围可及 15～ 2 0cm。
In this study,some chemical fertilizers and solonchak's salts were applied to pot soils at doses of 0.05% and 1.00% concentration and their effects on soil solute potential(SSP) were determined.The results showed that when fertilizers and salts were applied at the same dose,their effects on SSP were similar;but the SSP values were about 3 times higher at dose of 1.00% concentration than at dose of 0.05% concentration,which indicated that chemical fertilizers and solonchak's salts have the same effect on SSP despite the fact that the chemical natures of their main salt components are different.The effects of four different fertilizer application methods on SSP were different,the descending order of effects for the four methods was:application throughout plough horizon>hill application>basal application>surface application.In addition,in case of hill application,the smaller the distance from fertilizer placement,the greater the value of SSP.The limit influencing distance was 15～20cm.
出处
《上海农业学报》
CSCD
2000年第4期60-63,共4页
Acta Agriculturae Shanghai
基金
国家自然科学基金项目!"土壤有效水分与化肥相互作用机理及其应用研究"中一项研究内容
关键词
化肥
盐土盐分
施肥方法
穴施距离
溶质势
土壤
Soil solute potential(SSP)
Solonchak's salts
Chemical fertilizers
Application methods
Spacing of fertilizer placements
