The overall situation of weeding in paddy fields this year is:
1. Gramineous weeds in direct-flowing fields along the Weinan River Basin: Resistant yarrow, double-leaf gar, giant rice, Lee's, and Qianjin. Broad-leaved weeds: Trifolium reniformis, Apatula, wild grass, water bamboo
2. Grassy weeds in the dry field in the Huaihe River basin: resistant barley, yellow foxtail, rice Pleurotus eryngii, and Matang. Broad-leaved weeds: iron amaranth, three-edge grass, sorghum, cloves
Problems with weeding this year
1. Severe damage to quinclorac using overdose and severe resistance to penoxsulam;
2. Bispyribacillin also produces different degrees of resistance to barnyardgrass, and it is difficult to control the amount of drug and technology used.
3. Qianjin has high resistance to cyhalofop-butyl, even if 20% cyhalofop-butyl oxalate is still not effective;
(4) Complex preparations of oxazolidine and cyanorphan fluoride, which are hard to control and have serious damage to rice steals;
5. In recent two years, the popular “invisible cyhalofop-butyl oxalate†is commonly called “all invisible cyhalofop-butyl ester†and its quality is uneven. Some are ineffective against some resistant weeds. At the same time, the technical requirements for the application of pesticides are high, and the weeds rebound strongly. Maybe it may be related to temperature, Humidity and application technology;
6. For broad-leaved weeds, the difficulty of controlling iron leeks was increased, and high-dose fluoproxil application increased the resistance to weeds and was ineffective against sedge.
7. For Cyperaceae weeds, the rebound of the bentazone is severe and the amount of occurrence is increasing year by year.
From the recent field trials and demonstrations and exchanges with farmers' friends, the early stage of rice weeding and weeding has basically taken place. However, the problem of weeding and weeding is now more complicated. The effect of herbicides is poor, and the dosage, water consumption, temperature, humidity, etc. There are relationships.
The reason for poor weeding
Mainly sum up 4 points: "More than one high"
Weeds are of high density and species (especially the continuous expansion of the live broadcast area, mainly grasses, weed grasses, resistant horseshoe crabs, rice leeks, and green foxtails, and broadleaf grasses are Cyperaceae. And water bamboo-based).
2. More than the peak of weeding
The weeds in live fields have a long period of occurrence. The total weeding time is as long as 50 days, and they grow in synchronization with rice. The first grassing peak occurred 10-15 days after sowing, and this period was dominated by weedy grasses, Qianjin, Madang, and swampy weeds.
After 20 to 25 days after rice sowing, the second grassing peak appeared. This period is mainly styriasis and broad-leaved weeds such as heterophylla, bermudagrass, otter, knotted vegetables, etc.
However, during this period, there was no water retention in the fields, and the dry and wet and wet areas appeared. The third peak appeared again.
3. Many kinds of herbicides
According to preliminary statistics, there are no less than 30 single herbicides in China and more than 40 amide herbicides. However, although the variety of rice herbicides is relatively large, this has led to difficulties for farmers' friends to choose. Basically, they are following the recommendation of dealers' friends (especially in terms of cyhalofop-butyl esters. Farmers believe that a drug can solve all weeds in the field. Misleading.)
4. High cost of weeding
Why do we say weeding costs are high? There are 2 errors here:
Misunderstanding of the first misunderstood distributors (Qianqincao is not clear, all drugs are used for dispensing, and weeds are heavily rebounded)
The second misunderstanding occurred when the distributor misunderstood the pharmaceutical errors (especially the broad-leaved weeds and the conflorate trees, the selection of dimethyl tetrachlorine, and the mismatch between registration and use resulted in no once-used dose, and the weeds rebounded. Weeding
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