Simulation in Harm Degree of Mythimna seperata in Filling Stage and Its Effect on Maize Yield and Quality

doi:10.7668/hbnxb.2015.03.031

Abstract

Abstract: In order to study the characteristics of corn source-sink ratio,the leaves of different positions in maize on corn grain yield,the effect of M.seperata harm on maize quality,a field experiment was conducted,in which method of leaf shearing used and materials of hybrid maize Xianyu 335(XY335),Zhengdan 958 (ZD958) and Limin 33(LM33) were chosen,to simulate the harm degree of Mythimna seperata.The result showed:The reduction rate of source showed a positive correlation with the productivity reduction rate of maize,source reduction resulted in a decreased productivity of maize,the treatment of spike three and above the ear leaves remaining (L5+LE),the top five leaves remaining (L5),the top three remaining (L3),not leaf remaining (L0) decreased 4.22%,26.03%,39.26% and 48.82% to CK,respectively.Maximum and average yield reduction rate was 51.23% and 20.83%,through 30 filed experiments in Nong'an and Lishu County,also showed that M.seperata had a great harmful effect on maize yield. M.seperata caused maize yield decreased from 4.22% to 48.82% under different harm degree.Differences in different simulation treatments,varieties,interaction between treatment and varieties (P< 0.01) were significant proved by further variance analysis.The source-sink relationship changed by M.seperata damage also showed that,contribution rate of spike three to maize grain was larger than any other leaves in different position of maize,the average contribution rate of which was 48.08%,then followed were two leaves upper the ear leaf,and for the top three leaves of maize. M.seperata damage also influenced commodity quality of maize,kernel protein and starch content were significantly affected than fat,which were reduced by 9.73%~15.91% and 6.19%~11.11%,respectively.

Key words: Spring maize, Mythimna seperata, Harm, Simulation, Yield, Quality

CLC Number:

S513.01

CAO Qing-jun, YANG Fen-tuan, LIANG-Yao, JIANG Xiao-li, Lamine Diallo, LI Gang. Simulation in Harm Degree of Mythimna seperata in Filling Stage and Its Effect on Maize Yield and Quality[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(3): 180-185. doi: 10.7668/hbnxb.2015.03.031.

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