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Study on the Screening Index for Low Phosphorus Tolerance at Seedling Stage

ZHANG Yan-li et al (Mudanjiang Normal University Biology Department,Mudanjiang,Heilongjiang 157012)  
[Objective] Simple and reliable identification criteria used in screening phosphorus efficiency of soybean at seedling stage was discussed.[Method] Using the high and low phosphorus soil pot experiment,the soybean seedling stage's 5 criteria including RPH,RAW,RRW,RAPC and RRPC were studied.[Result] Low phosphorus stress had the low effects on relative plant height,the coefficient of variation was only 9.07%,which had not achieved the remarkable level with its its criteria's relevance;Low phosphorus stress had the higher effects on relatively above-ground dry weight and relative dry weight of root,relatively above-ground phosphorus concentration and relative root phosphorus concentration,its coefficient of variation was also big,which were 26.67%,22.68%,24.01% and 15.87% respectively,The correlation coefficient among the indicators had significantly or extremely significantly positive correlation.[Conclusion] Relatively above-ground dry weight and relative dry weight of root,relatively above-ground phosphorus concentration could be used as an important indicator of comprehensive evaluation of screening phosphorus efficiency of soybean at seedling stage,while the relative root phosphorus concentration could not be used as secondary screening index.
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