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The Relation of Phosphorous Nutrition to Growth and Symbiotic Nitrogen Fixation of Soybean Cultivars

Ding Hong Li Shengxiu (Department of Resources and Environmental Science,Northwestern Agricultural University,Yangling,Shaanxi 712100)  
A water culture experiment was conducted to study the relation of phosphorous nutrition to soybean growth and its symbiotic nitrogen fixation.The results showed that shoot dry weights,nodule numbers,nodule dry weights and nitrogen fixation activities were evidently increased with the increase of phosphate fertilizer rates when phosphorus added to nutrient solution was below 9.3 mg/L,and greatly decreased when it was in the range of 9.3-37.0 mg/L.Excessive phosphorus in solution would bring about phosphorous toxicity to soybean plants.However,a significant linear regression was found between accumulative P amounts in the above ground plant and fertilizer P added.The phosphorus contents in different parts of plant were as follows:nodule rootshoot;and the nitrogen contents were in the order:noduleshootroot.In additon,the two soybean cultivars had different response to phosphate fertilizer as shown in this experiment.
【CateGory Index】: S565.101
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