Effects of Herbicides Applied with Drip Irrigation Water on Weeds and Tobacco Growth

CHENG Gong; WEI Yichang; WANG Weichao; ZHANG Liding; LI Jianqiu

doi:10.15933/j.cnki.1004-3268.2016.04.019

Abstract：To explore the effects of different soil-treatment herbicides application with drip irrigation wa-ter,five kinds of soil-treatment herbicides (50% Napropamide wettable powder,90% Diphenamide wetta-ble powder, 96% S-Metolachlor emulsifiable concentrates, 72% Metolachlor emulsifiable concentrates, 48% Alachlor solution emulsifiable concentrates) were selected to be applied with drip irrigation water in high quality tobacco fields in Xiangcheng county from 2012 to 2014. The application dosages of the herbi-cides were the same as the optimum dosages prescribed by the manufacturers. The check of weed control was micro-spray irrigation with no herbicide application (CK-1),and the check of herbicide application rate was drip irrigation with no herbicide application ( CK-2 ). Results showed that weed control effects of soil-treatment herbicides applied with drip irrigation water were more than 90. 97% to CK-1 and above 72. 56% to CK-2. And the increase of yield,superior yield,leaf number and leaf area index of five herbi-cide treatments reached extremely significant level to both controls ( CK-1 and CK-2 );the effect of diffe rent herbicide treatments on plant height did not reach significant level, but that on other characters ( yield,superior yield,leaf number and leaf area index) reached significant level. Among the five kinds of herbicide treatments,the effects of 50% Napropamide wettable powder and 96% S-Metolachlor emulsifia-ble concentrates on weeds and tobacco leaf production were better. The weed control effects were 96. 10%and 95. 36% respectively to CK-1,88. 15% and 85. 90% respectively to CK-2. Tobacco leaf yields were increased by 19. 98% and 17. 28% respectively to CK-1,7. 50% and 5. 08% respectively to CK-2,and superior tobacco yields were increased by 95. 30% and 82. 98% respectively to CK-1, 48. 06% and 38. 71% respectively to CK-2. At the same time the tobacco plant height,leaf number and leaf area index of them were also increased at different degree to the other three kinds of herbicides. So,applying the five kinds of soil-treatment herbicides with drip irrigation water is feasible,which can effectively control weeds and significantly increase tobacco economic and agronomic levels. It is suggested that 50% Napropamide wettable powders and 96% S-Metolachlor emulsifiable concentrates should firstly be preferred as soil-treatment herbicides applied with drip irrigation water in tobacco fields of central Henan province.