In the rice planting management, the operation of weeding can be said to be indispensable, but there is such a malignant weed that brings problems to the growers. It is a thousand gold, it has a large area and is resistant. .
Thousands of gold are harmful, mixed in rice, not easy to control, and fight for water and nutrients with rice, which brings harm to the normal growth of rice, mainly in the following three aspects:
1, causing weak rice seedlings
As mentioned above, Qianjin will compete with rice for water and nutrients. When rice does not absorb enough water and fertilizer, the supply cannot reach the speed of growth. The most obvious consequence is that rice has weak yellow hair and brings the final yield. loss.
2. The number of effective spikes affecting rice
Xiao Bian once saw an experiment, the impact of Qian Jin on the effective panicle of rice, the data is that when there are 4, 15 and 50 plants per square meter, the effective panicle number of rice will be reduced by 0.3%. 16.6%, and 69.4% (The above data is for reference only, because the results of experiments in different regions will be different, and everyone understands what they mean).
3, reduce 1000-grain weight
This point is also illustrated by a data, specifically the above conditions, when there are 4, 15 and 50 thousand gold per square meter, the 1000-grain weight will be reduced by 7.3%, 20. 2%, 28.4%, this data is for your reference only. Because the environmental factors in different regions are different, the results of the experiments will be different.
The above three aspects are the harm that Qianjin brings to rice. It can be said that it can directly harm the final yield. However, some friends will ask why some plots occur in the same place during the actual planting process. The area is large, and some plots have a small area? There are also three reasons for this:
1. Uneven plots
When some fields appear to be uneven, the effect will be compromised when using the closed drug, and the damage of the later thousand gold will be serious.
2, water management is not in place
When the water is not filled, the water does not release water, and the rice grows weaker, but the growth of the gold is not weak, and it also affects the effect of the herbicide.
3, in previous years, not to force
In particular, the growers who planted a rice crop had more than one thousand gold in their own fields in the past year. The control effect was not good. After harvesting and before the second year of planting, there was no good land preparation, and the residue of thousands of gold was not cleared. The number of provenances of thousands of gold will increase, and the harm of the second year will become larger and larger.
So, knowing the harm of thousands of gold, how do we choose herbicide control? Then look. Mainly divided into 2 points, one is closed, the second is post-emergence weeding, using a combination of blocking strategy.
First, the closed, closed drug can choose a single agent of pretilin or benzimid-propionamide compounding agent, of course, other blocking drugs can also be used.
After the completion of the closure, it basically has a certain inhibitory effect on the occurrence of thousands of gold. Of course, it is not 100% effect. When there are thousands of gold in the field, how to choose post-emergence herbicides?
At present, the commonly used agents are: cyhalofoprin, oxazolamide, benzoxazole and chlorpyrifos. In general, the resistance is not too serious, and the cyhalofoprin can be a single agent. Severe plots, need to use compounding agents, such as cyhalofoprin + carbendazim, cyhalofoprin + oxazolamide, or ternary compound, specific medication, according to local gold The resistance is decided, and it is difficult to say that it is difficult to prevent it. It is not difficult or difficult to say.
However, when using post-emergence herbicides, the following points should be noted:
1. On sunny days, it is recommended to apply the medicine after 16 pm. It can be used all day on cloudy days. Do not apply medicine on rainy days.
2. If the field is rich in gold and has high resistance, it is recommended not to mix with broadleaf herbicides and single-grain herbicides.
3, if thousands of gold grass age, you can increase the amount of drugs, but not excessive, so as not to cause phytotoxicity, it is recommended not to increase the amount of more than 20%.
With regard to the introduction of rice and gold, as well as prevention and treatment methods and pharmacy, Xiaobian said so much, I hope to bring some help to rice growers, if you have other questions, you can leave a message in the comment area below.
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