【摘要】 <正> 白浆土广泛分布在黑龙江省东部和吉林省部分地区,黑龙江省境内主要分布在三江平原、完达山前的岗地和平地以及抚远三角洲,面积近三千万亩,已耕地九百多万亩。三江平原的耕地中,白浆土占31%。因此,白浆土是我国东北已垦及有待开垦的重要土类之一。由更多还原

【Abstract】 Accrding to a four years’ observation on the soil moisture fluctu- ation of gleyed planosol sampling down the profile to 1 meter depth,the characteristics of soil moisture change following the season and the curves of moisture fluctuations were obtained. Gleyed planosol is a kind of hydromorphic soil with three distinct layers on the profile,namely black chernozemic layer,white eluvial layer and brown illuvial layer.The last two layers are highly compact and impermeable. The soil moisture fluctuation during a year may be divided into five periods:1.thawing period(the end of March to the end of April), 2.drying period(the beginning of May to the middle of July),3.rainy period(the middle of July to the middle of September),4.relatively stable period(the middle of Sept.to the beginning of Nov.),and 5.frozen period(the beginning of Nov.to the end of march). When water requirement of spring wheat,corn and soybean iscom- pared with the moisture content of soil and rainfall during the growing season,spring wheat is the plant that suffers most easily from drought, and corn is the second one in order.Development of irrigation would increase the production accordingly,especially the production of wheat. Soil reclamation including irrigation,drainage,organic manure application,reformation of the compact white layer by under tillage and deep fertilization,and horizontal strip cropping of the slope are recommended.更多还原