Problems in the use of herbicides in summer maize planting
Summer corn is generally planted in late May and mid-June. At this time, it has entered the summer season. The temperature is high, the rainfall is high, and the emergence of weeds is fast. If it is not timely, it will easily cause the grass shortage to reduce production. Chemical weeding should be post-sow. Soil treatment before seedlings is dominant.
Due to the short interval between the sowing period of summer maize and the sowing date of post-crop wheat, the herbicide should be used to pay attention to the effect of wheat on the post-crop crop. For example, atrazine is one of the commonly used herbicides in corn fields, but the field has a long-lasting effect. Long, if the dosage is too large or the application is not uniform, it is easy to cause residual phytotoxicity to the wheat after the sorghum crop. The length of the aftereffect period of Atrazine is affected by many factors, and the application amount per unit area is the key factor. The dosage of the chemical is large, and there are many residual chemicals in the soil. When the concentration of atrazine in the soil is more than 0.1 mg/kg, the germination and growth of the wheat are affected, the speed of the solution of the atrazine and the uniformity of the spray, the soil texture, Rainfall, soil pH and other factors are magnetic. Studies have shown that 38% of the glutinous saponin suspension is applied to the summer maize in North China as a critical value. If the dosage is exceeded, it will easily cause phytotoxicity to the stalk crop wheat. All localities can flexibly control the appropriate dosage according to local conditions, while corn treasure, 40% acetaminophen suspension, 50% Hebao emulsifiable concentrate are high-efficiency broad-spectrum herbicides that are safe for corn and crops, due to summer. During the sowing period of corn, the temperature is high and the rainfall is high, which is beneficial to the efficacy of the herbicide. The lower limit of the recommended dosage or the appropriate reduction of the dosage can also achieve higher herbicidal effect.
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