Spring farming is very busy, and it is inevitable to deal with herbicides. Therefore, we must understand the residues of herbicides. In this article, the author focuses on some of the problems that are easy to occur with herbicides, and must be addressed.
Before and after herbicides, the problem of drug residues
1. Different herbicides should be selected according to soil characteristics, microbial species, climate and irrigation conditions.
For example, herbicides containing a chlorsulfuron component are primarily degraded by hydrolysis in the soil. In the case of encountering alkaline soil in the field, less rainfall in the year, and drought in the soil, their residual period in the soil is often prolonged, and the later crops are vulnerable;
Conversely, if the acid soil, the soil is wet or the farmland is irrigated, the residual period is shortened and the crop is relatively safe.
2. Long-residue herbicides that cause phytotoxicity to the crops of the sorghum, can not be planted!
peanut
Before the use of chlorsulfuron-methyl, nicosulfuron (more than 4 grams per mu of active ingredients), simazine (over 150 grams per mu of active ingredients), atrazine (active ingredients per acre more than 133 grams), You can't grow peanuts in the jaw.
Sorghum
Formerly used chlorsulfuron-methyl, nicosulfuron-methyl (more than 4 grams per mu of active ingredients), broad-leaf clear (oxasulfuron, more than 3.2 grams per mu of active ingredients), metsulfuron-methyl (active ingredients per acre) More than 0.5 grams), the lower jaw can not grow sorghum.
Wheat, barley
The active ingredient of chlorosulfuron-methyl is more than 1 gram, the active ingredient of simazine is more than 150 grams per acre, the active ingredient of atrazine is more than 133 grams per acre, and the active ingredient of esculin is more than 48 grams per acre. Can not grow wheat, barley.
rape
The active ingredient of the former flufenacil is more than 25 grams, the effective ingredient of the sulfonamide is more than 0.5, the effective ingredient of the chlorsulfuron is more than 1 gram, and the active ingredient of the quinclorac is more than 7 grams.
Herbicide use interval summary
Azinone
No easy wheat in 4 months;
It is not easy to grow rice within 8 months;
It is not easy to grow beets, tobacco and onions within 18 months;
It is not easy to grow sunflower within 2 months.
Heterophyllum
(1.5 kg per hectare)
It is not easy to grow corn within 12 months;
It is not easy to grow wheat, sunflower and onion within 16 months;
It is not easy to grow beets and potatoes within 9 months.
Imazan
(0.5-1 kg per hectare)
No easy corn, wheat, or tobacco within 12 months;
It is not easy to grow rice within 24 months;
It is not easy to grow sunflowers within 18 months;
It is not easy to grow potatoes within 36 months;
It is not easy to grow onions and melons, eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 40 months;
It is not easy to grow beets within 48 months.
Chlorsulfuron
(80g per hectare)
It is not easy to grow corn, wheat, tobacco, and sunflower within 15 months;
It is not easy to grow melons, eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 36 months;
It is not easy to grow potatoes within 40 months;
It is not easy to grow beets within 48 months.
Nicosulfuron
(The dosage per hectare exceeds 60 grams of active ingredient, ie 4% nicosulfuron is more than 100 ml per acre)
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage, and potato within 18 months.
Chlorsulfuron
(15 grams of active ingredient per hectare)
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 24 months; potato; corn.
Fomesafen
(25% sulfamethasone 1.5 kg per hectare)
No easy wheat in 4 months;
It is not easy to grow rice and tobacco within 12 months;
It is not easy to grow onions, eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 18 months;
It is not easy to grow beets, corn, sunflowers and potatoes within 24 months.
Azoxysulfuron
(48-60 grams of active ingredient per hectare, ie 80% sulfasalizate 3.2-4 grams per acre)
It is not easy to grow potatoes within 12 months;
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 26 months.
Methotrexate
(more than 7.5 grams of active ingredient per hectare)
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 24 months; corn;
It is not easy to grow potatoes within 34 months.
Isooxazolone
(more than 71 grams of active ingredient per hectare)
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 18 months.
Quinclorac
(106-177 grams of active ingredient per hectare)
It is not easy to grow peppers, eggplants and carrots within 24 months; potatoes.
Atrazine
(More than 2000 grams of active ingredient per hectare, ie 38% atrazine over 350 ml per acre)
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 24 months; soybean, wheat, rice, potato, melon, beet, sunflower, tobacco, onion.
Simazine
(More than 2240 grams of active ingredient per hectare, ie 50% simazine exceeds 300 grams per acre)
It is not easy to grow eggplant, pepper, cabbage, radish, carrot, cabbage, cabbage in 24 months; potato.
Summary note:
If the land is covered, it is necessary to ask about the herbicides used for planting crops and applications in the previous year. If the products used in the former sputum, such as atrazine, sulfimsulfuron, oxazinone, and flufenazone, Leaf crops, either without land.
If it is prepared to replant broad-leaved crops next year, it is recommended to use bentazone in potato and soybean fields to control broadleaf weeds. Nicosulfuron, mesotrione and flufenacetate are recommended for controlling weeds in corn fields.
In the case of corn-and-brown cropping areas, and the use of cornfield herbicides is relatively late, there have been cases where the residual nicosulfuron-methyl affects the emergence of wheat.
In the case of wheat field, if there are wheat, intercropping peanuts, watermelons and other broad-leaved crops, it is recommended to use or not with fensulfuron and products containing bensulfuron-methyl. Two months of residue can cause heavy phytotoxicity.
Some manufacturers have done oxyfluorfen and glyphosate compounding, pushed in the corn field before the seedlings, the previous two years have been no problem, but in the third year began a large area of ​​phytotoxicity, no emergence, lost a blood No return. After many arguments, it should be undoubtedly the accumulation of glyphosate.
After using glyphosate, it takes at least one week to ten days to grow large seed crops such as corn. If you want to grow small seed crops such as vegetables, it will take at least one month. The residual period can be seen in general, even if the dosage is too large, It is difficult to degrade in years.
If glyphosate is used in shallow root crops such as grapes, kiwis, and peach trees, it is not good to water or rain. When it rains or waters, there will be obvious symptoms of poisoning on the leaves, and the fruits will basically stop growing. That is, you can continue to grow up, and there will be deformities. If it is used on fruit trees that grow small saplings such as jujube trees, the phytotoxicity will definitely appear.
In addition, before the use of 2,4-D butyl ester in wheat, corn and other crops, the straw is not cleaned, the straw is returned to the field, and the broad-leaved crops such as vegetables planted in the sorghum are twisted and poisoned. It has also been seen that the use of 2,4-D butyl ester to throw the bottle inside the well, resulting in varying degrees of distortion and wilting symptoms in the vicinity of dozens of acres of pepper after watering.
Like the plots of sweet potatoes, the amount of paclobutrazol used is too large, and the residual dose in the soil often causes the crops to grow out, and the seedlings are thick and short, that is, they cannot grow long. (Agricultural Investment Report)
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