Understanding the effect of herbicides on post-crop crops
Understanding and keeping in mind the effect of herbicides on post-planting crops can effectively reduce the incidence of herbicides, reduce economic losses, and increase the use of herbicides. When farmers win, more importantly, they can effectively reduce herbicide pollution. , Improve crop safety indicators. The safety of herbicides to crops should include two aspects: the safety of herbicides to current crops and the safety of post-crop crops. In recent years, due to improper use of certain herbicides, it has caused phytotoxicity to crops after harvest and caused losses to production. The effects of several herbicides on post-crop crops are described.
First, kill the fleas (quinacrine)
According to reports from the United States, no crops can be planted except for rice within 309 days after the fast killing application. Eggplant and tobacco cannot be grown within 12 months. Tomatoes and carrots cannot be grown within 2 years. In addition, Umbelliferae crops such as carrots, celery, parsley, etc. are very sensitive to swift slaughter, and care should be taken not to cause drifting phytotoxicity;
Second, chlorimuron-ethyl (bean yellow long)
It has a long retention period in soil and should not be used to grow beets, rice, potatoes, melons, vegetables, sorghum, and cotton. Cannot be used in soils with pH greater than 7. The soybean active ingredient is 5.6 grams per hectare and can be planted with cereals and alfalfa forage at 3 months after application; soybean huanglonglong corn can be cultivated after 6 months; pods, clover and cotton can be grown after 9 months. Cucumber, corn, peas.
Third, sek (Acetochlor, oxathione)
According to reports, 4 to 1920 grams of the effective composition per hectare of Sai Ke, four months later can be planted lotus root, asparagus, barley, corn, grass, wheat, potato, red bean grass, tomato, sugarcane, soybean; 8 After the month, rice, cotton, and peas can be grown; after 12 months, crops other than roots can be planted; after 18 months, onions, beets and other root crops can be planted. It is recommended that Secor use a dose of 210-560 grams per hectare of active ingredient. This dose is generally safe for post-crop crops. However, in arid regions, soil organic matter content is low, and high-dose sac on alkaline soils with a pH greater than 7.5 may cause phytotoxicity to beetroots.
IV. Guang Wu Ling
According to reports, Guangmianling, which contains 560 to 1400 grams of active ingredient per hectare, can be used to grow rice, cotton, corn, pepper, tobacco, cucurbit (pumpkin, melon, cucumber, etc.) crops 9 months after application; 12 months After the planting of tomatoes, wheat and sweet potatoes, all crops can be planted after 16 months. The recommended dosage of Guangmiaoling is 480 g/ha. This dose is mixed with other drugs and has no effect on post-production. Repeated spraying only slightly affects wheat, yellowing leaves of wheat seedlings, but recovering in the short term. Does not affect wheat production.
V. Pu Shi
Pust is a long-lived herbicide. According to U.S. report, wheat, rye, navy beans, pods and peas can be planted four months after application of Pust (perchlorate of 1.4%) at 70 grams of active ingredient per hectare; and barley can be grown after 9 and a half months. Tobacco; 18 months later, corn (including seedlings for maize seedlings), cotton, lettuce, oats, potatoes, safflower, sweet corn, and sorghum can be planted; sugar beets can be grown after 40 months; other crops can be planted after 26 months. Pusit is degraded in acidic soils and degrades rapidly in alkaline soils. Kusaoqing degrades rapidly in alkaline soils and degrades slowly in acidic soils. If beets, canola, and cotton are grown on fields that use Kusaoqing, they must be separated by more than two years.
Sixth, Kushiro Kiyoshi
It degrades rapidly in alkaline soils and degrades slowly in acidic soils. For example, sugar beet, rapeseed, and cotton must be kept at intervals of two years or more in the field where Koma grass is applied.
VII. Amifostrone
The use of ethametsulfuron for weed control on rapeseeds was significant, especially for continuous use. However, after the last application of ethametsulfuron in rapeseed field, the rice transplanted 5 months later was prone to serious damage. Severely reduced production and even no harvest. According to the test, rapeseed field containing 22.5 g of the active ingredient of ethametsulfuron per hectare, and the rear pods replanted after the death of rice, will still show some phytotoxicity.
Eight, chlorsulfuron and its compound
Sulfonyl urea herbicides and their compounding agents such as chlorsulfuron are used on wheat fields. Residues in the soil can cause the growth of corn, peanuts, soybeans, potatoes, and other crops that grow slowly, deformed or even die. After the last application of chlorsulfuron and its compound in the wheat field, the damage to the corn transplanted four months later was the heaviest. After transplanting for one month, the corn seedlings stopped growing and dead seedlings appeared; for transplanting for 16 months Maize is heavier; it is less harmful to transplanted corn at 28 months. Therefore, in order to ensure safety, corn may not be grown until at least 28 months after the application of chlorsulfuron and its formulation herbicide.
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