摘要
采用相关分析和通径分析法研究了稻水蝇危害与水稻产量损失的关系。结果表明 :水稻产量(y ,kg/hm2 )与田间虫口密度 (x ,头 /m2 )、穗损失率 (x5,% )间 0 0 1水平显著时的关系符合方程 :y ^ =9433 96 5- 6 6 6 37x1- 40 2 746 9x5;产量损失 (Y ,kg/hm2 )与田间虫口密度 (x ,头 /m2 )间关系符合下列方程 :Y ^ =- 13 4989+6 0 0 43x (r=0 96 47 )。通径分析显示 ,穗损失率和虫口密度对产量建成直接效应最大 ,分别为 -0 92 18和 - 0 142
Rice yield loss caused by Ephydra macellaria Egger in rice fields was studied through correlation test and path analysis. The results were as followed: When α=0.01, the relationship between rice yield (y) and pest density (x 1) and fringe loss rate (x 5) was in compliance with equation: y ^=9 433 965-6 673 7 x 1-402 746 9 x 5. The relationship between rice yield loss (Y) and larva density (x) yiel complied with equation: Y ^=-13 498 9+6 004 3 x (r=0 964 7 ** ). Path analysis showed that the effects of fringe loss rate and pest density on rice yield was most significent, and the effect numerical values were -0.921 8 and -0.144 2 respectively.
出处
《植物保护》
CAS
CSCD
北大核心
2002年第1期15-18,共4页
Plant Protection
