As the price of corn fell sharply, the planting of corn-based Lishu County will be the planting structure adjustment. Western sandy ground will be more choice to grow peanuts and other grains and other crops; in some areas to increase soybean, potato and melon, leafy vegetables planted. As the original corn cultivation process is basically the use of chemical herbicides for weeding, in particular the use of part of the plots of long residues of herbicides, so in the adjustment of plant structure should pay attention to the impact of herbicides on the next crop.
First, the injury caused by the situation
Herbs in the county often used in the herbicide, whether it is a seedling sealant or post-emergence stems and leaves treatment agent on the next year, the main cause of injury is atrazine, followed by nicosulfuron.
1, Atrazine generally in the soil of the residual period of 18 months or so, Atrazine water-soluble, in the soil have a greater mobility, easily leaching into the deep rain, the size of precipitation On the leaching of atrazine played a key role (I County in the autumn of 2016 more precipitation, is doubled over the years, to reduce the injury is more favorable), during the cultivation of peanuts, wheat, rice, beans, millet, Leafy vegetables, fruits and vegetables, fruit trees or herbs and other crops will produce different degrees of phytotoxicity, especially vegetables, rice, miscellaneous beans, herbs and so on.
Atrazine safe dosage is generally 38% of the content of 3 kg / ha, no more than this amount of planting next year, other crops will not produce a large injury. However, according to the recommended amount of pesticide use and the daily use of farmers to see the law, the use of the basic dose of about 5 kg / hectare, often more than the time to use this dose. It is easy to lead to the next year, there are phytotoxic crops, especially sensitive crops.
2, nicosulfuron in the soil residual period is relatively long, compared to atrazine compared, nicosulfuron residual detoxification lighter. However, if the use of 4% of the amount of last year, the amount of nicosulfuron, the general amount of more than 1500 ml hectares, it will be part of the next year, crop damage. General leafy vegetables and vegetables and vegetables and vegetables are sensitive to vegetables, as well as sorghum, sunflower, watermelon, pumpkin, beans, etc., the safety interval of 18 months. Other crops such as soybeans, peanuts, rice, potatoes, etc., as long as the interval of 12 months there is no problem.
Second, the drug damage solution
The cultivation of structural adjustment of the land to do a comprehensive and meticulous investigation to understand the mastery of the use of herbicide in 2016 the type and dose, not the use of atrazine and nicosulfuron herbicide or other residues can produce residual residues Of the plots can be rest assured to adjust the cultivation; the use of the above drugs but in the safe dose range can also be normal operation; but for the previous year is too large, has exceeded the safe use of the dose of the plot, planting structure must also be adjusted, Take appropriate measures to deal with.
1, soil chemical treatment. To carry out rotary tillage or deep turn, at the same time to use Nai'an, brassinolide, sodium nitrophenolate and other regulators mixed soil prevention.
2, dry land to change the paddy field of the land, to deep turn or rotary tillage, and then use the water Jiaanai and other fields 5-7 days, and rinse 1-2 times and then transplanting.
3, after the emergence of crops, once found that the symptoms of phytotoxicity, immediately spray brassinolide, gibberellin, indole acetic acid and other plant growth regulators to control.