Problems needing attention in the use of herbicides in Maize planting

In the spring corn field in the north, because of the low temperature during sowing, drought and little rain, in order to ensure that the soil before sowing has a good weeding effect, it is necessary to irrigate enough soil moisture, fine soil preparation, suppression after sowing, and then apply herbicides, if the soil moisture is not good, it can be shallow mixed soil (2cm) or enter sprinkler irrigation to improve the weeding effect, and because of low temperature and less rain during application. Moreover, the interval between the sowing time of the following wheat is longer, so it can be applied according to the upper limit of the recommended dosage or appropriately increased to ensure a higher herbicidal effect. Corn is generally sown from late May to the first and middle of June, when it has entered summer, the temperature is high, the rainfall is high, and the weeds emerge and grow fast. if they are not prevented in time, it is easy to cause the reduction of yield caused by grass famine. chemical weeding should be dominated by soil treatment before seedling after sowing. Due to the short interval between the sowing period of summer corn and the sowing period of wheat, the selection of herbicides should pay attention to the effect on wheat, for example, atrazine is one of the herbicides commonly used in corn field, but the field effect period is very long. if the dosage is too large or uneven application, it is easy to cause residual damage to the following crop wheat, and the residual period of atrazine is affected by many factors. The amount of pesticide applied per unit area is the key factor, and when the amount of atrazine in soil is more than 0.1mg / kg, the germination and growth of wheat are affected. The human release rate of atrazine is magnetized with spraying uniformity, soil texture, rainfall, soil PH and other factors. The study shows that 38% of atrazine suspension applied to summer corn in North China is the critical value. If the dosage exceeds this dosage, it is easy to cause drug damage to the following crop wheat, and all localities can flexibly control the appropriate dosage according to local conditions. Maimaibao, 40% atrazine water suspension and 50% Hebao EC are safe and efficient broad-spectrum herbicides for corn and subsequent crops. due to the high temperature and rainfall during the sowing period of summer corn, it is beneficial to the efficacy of herbicides, and the lower limit of recommended dosage can be used or appropriately reduced. It can also have a higher weeding effect.