摘要
根据有代表性的２ 县１０５ 块夏玉米田调查，菏泽地区夏玉米田杂草种类共１７ 科３５ 种，分析探明优势种类１２ 种。试验表明不同杂草混合种群密度与夏玉米产量损失率相关极显著，相关式为ｙ＝４ ．７２３ ６ ＋ ０ ．１８７ ４ｘ 。提出其化学除治指标为每平方米有杂草２０ 株。
Weeds in 105 representative pieces of summer maize fields were in vestigated in Heze District. The results showed that 35 species of 17 families weeds were found, and 12 of them were the dominant species. The test showed that the relationship between the yield loss (y) and the weed density (x) was extremely remarkable, and the relative formula was y =4.723?6+0.187?4 x . Chemical control index was raised, which it was 20 plants per square meter. Kdy words summer maize weed dominant species control index showed that the resolution of E bacterium medium, F bacterium, A bacterium, H fungus, seven species bacteria mixtures, seven species of bacteria and H fungus mixtures and C bacteria were 9.98%,9.51%,7.92%,7.20%,6.67% and 4.36% respectively , the secondary resolution of D bacterium was 3.34%, and that of B and G bacteria was only 2.68% and 0.67% respectively.
出处
《植保技术与推广》
1999年第6期29-30,共2页
Plant Protection Technology and Extension
