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The analysis of marginal effect index of potato main properties

ZHANG Shaorong,LONG Guo,LU Yi,WU Tao (Bijie Agricultural Science Institute, Guizhou Bijie 551700,China)  
The marginal effect index of potato main properties has been mensurated and studied with correlative analysis and grey relational grade analysis.The results showed that the marginal effect index could be used as a choice for tolerant dense planting potato breed and as a parameter of potato plant density.The marginal effect index of the variety No5(D) is the minimum,the outside and inside differences of comprehensive properties in community are the least,the correlative degree is the biggest and the stability is good.It is suitable for dense planting and the proper density at 3 500-4 000 stubs·667m-2 is suggested in this paper.
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