Feature Analysis on Nutrient＇s Restrictive Factors of Major Low Productive Waterlogged Paddy Soil in China
The nutrient characteristic in soil sample of seven provinces which is the main distribution region of waterlogged soil in China was analyzed.Compared with high-yield fields soil in the same area,some results were found as below： The contents of organic matters（13.76~21.52 g/kg） and total phosphorus（2.78~11.36 g/kg） in the waterlogged soil were higher than that in high-yield field soil,and a significant difference was found between them in some provinces（P0.05）.Total nitrogen contents（1.39~2.24 g/kg） in the waterlogged soil were a little more than in high-yield fields soil,but there was no significant difference between them（P0.05）.The level of contents of available zinc in the waterlogged soil was higher than in high-yield fields soil,and the difference was significant（P0.05）.The above nutrient characteristic in waterlogged soil indicated that the waterlogged soil had a higher level of potential productivity.But in waterlogged soil,the value of the pH（4.47~5.32） was significant lower than that in high-yield fields soil.And the levels of reducing sulfur（296.12~3 069.33 mg/kg） and ferrous iron（160.28~3 786.12 mg/kg） ion were significant higher than that in high-yield fields soil（P0.05）.At the same time,it was significant lack of available phosphorus（1.90~30.20 mg/kg） and available potassium（1.30~111.70 mg/kg） in waterlogged soil to some provinces.This suggested that above several nutrient indexes were the important obstruction factors which influence the productivity in waterlogged soil.In conclusion,only after a series of improvement which focus on the above mentioned nutrient＇s restrictive factors,the waterlogged field will turn in to the significant strategic resources of crop production in China.
国家科技期刊平台
NSTL
万方数据
维普
