Long residual herbicides means that after certain herbicides are used, pesticide residues in the soil for more than one year utility, easy to make the sensitivity of the succeeding crop injury suffered varying degrees of herbicides.
In production practice, the phytotoxicity of the sorghum crops occurs due to the application of long residual herbicides, causing undue losses to production. For example, long-term residual herbicides such as methicone, chlorsulfuron, and acesulfame-methyl, which are currently used in various places, often cause yellowing, dwarfing and other phytotoxicity symptoms in the rice growing season. Therefore, it is necessary to pay attention to the harm of such herbicides to the crops.
First, different herbicides should be selected according to different soil characteristics, microbial species, climate and irrigation conditions. The herbicide containing the chlorophyll component is mainly degraded by hydrolysis in the soil. In the case of encountering the alkaline soil in the field, the rainfall in the past year, the soil drought, etc., the residual period in the soil is often prolonged, and the later crops are vulnerable; on the contrary, the acid soil, the soil is moist or the farmland is filled, the residual period is shortened. The crops are relatively safe.
2. Before planting the crops, it is necessary to know whether the herbicides applied in the previous crops have phytotoxicity to the crops. For example, if the herbicides containing green huanglong and jiahuanglong components, such as wheat grass, wheat straw, etc., have been applied before, the corn, soybean, cotton, peanut and other crops cannot be planted, and they cannot be used as polders. In recent years, in some places, after the use of benzofuran (also known as superstar, broadleaf net), different degrees of phytotoxicity have been caused to the sorghum peanuts, resulting in difficulty in emergence of peanuts, slow growth and reduced yield.
Third, improve the application method and reduce the amount of soil residue.
1) The dosage should be accurate, the spray should be uniform, no leakage, no heavy spray. For example, the application of herbicides containing green huanglong ingredients in recent years not only causes phytotoxicity to the sorghum crops, but also has phytotoxicity to the seasonal crops.
2) The period of use should be flexible. It can be treated before the crop is planted, before the seedlings, or after the seedlings. At present, Puschte, G., and Atrazine should be sprayed early in the post-emergence to reduce the dosage and reduce the residue. When used after emergence, add auxiliaries or synergists to improve the efficacy and reduce the dosage.
3) Rational application. Mixing green huanglong with 2,4-D butyl ester can reduce the dosage of chloro-Huanglong by 50%. Tips for China Pesticide Network : Puschte soil treatment can be mixed with trifluralin, acetochlor, alachlor, sikkon, etc. The use of Pu Shite and Guangshiling for strip spray can reduce the dosage by more than 30%.

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