Changes in the soil environment

论文简介：

Effects of excessive fertilizer and manure applications on the soil environment were compared in greenhouse vegetable systems shifted from wheatemaize rotations 5-15 years previously and in wheatemaize rotations. Substantial mineral N and available P and K accumulated in the soil and leaching occurred down the soil profile in the greenhouses. Soil pH under vegetables was significantly lower than in the wheatemaize fields, while the EC was Significantly higher in the vegetable soils. The mean Cd concentration in the vegetable soils was 2.8 times that in the wheatemaize rotations. Due to excessive fertilizer application in greenhouse vegetable production in northeast
China, excessive salt and nitrate concentrations may accumulate and soil quality may deteriorate faster than in conventional wheatemaize
rotations.



附件名：20092101234249535575.zip

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