First, do not fight big

It is to wait until the weeds grow for a certain period of time to start using the medicine. If the weeds are small, the area of ​​the weeds contacting the liquid is small, which is not conducive to the death of weeds. The most obvious situation is rebound or poor effect.

But the weeds should not be too big. If they are too big, the resistance will increase and they need to be added.

In general, weeds are best used in the 2~4 leaf stage.

Second, the secret is not thin

This sentence is also awkward? Do not start spraying because a small part of the weeds just grow in the field. The result of this is about half a month or so. It is found that there are more and more weeds in the field, before the fight. More, this is what is going on?

If the weeds are too thin, most of the liquid is hit on the ground, and then volatilizes. After a few days, the weeds grow slowly, which means that the medicine used in the previous few days is completely ineffective and has to be re-played.

Therefore, when the weeds are almost out, and then a little secret, then go to fight drugs. The secret here is not big, remember to distinguish.

Third, wet and not dry

The last point is what it means? In fact, it is to look at the sensation in the ground. The weather is not good. When the weather is relatively dry, try not to fight drugs.

Why? The grass is dry and the weeds are short of water. In order to keep the water, the pores will be closed. In this case, the liquid will not be absorbed, and the effect will be normal, and the weeds will not die.

Then some people say that the weeds have been 2~4 leaves, and they are still relatively dense. If this is a drought, if I don't fight drugs, don't I miss the best time?

This problem is often encountered in actual production. There are two ways to solve it. One irrigation watering, and two more water when spraying, increase the water consumption, but the overall concentration of the liquid cannot be reduced.

supplement:

1. Do not use turbid water when using the liquid, and it is best to use the secondary dilution method to make the drug droplets evenly dispersed.

2. The atomization of the sprayer should be moderate, the droplets are too large, the distribution of the leaf surface is not good, and it is easy to roll off, the droplets are too small, the evaporation effect is obvious, and the potency is lost.

3. Avoid dew and do not apply before spraying.

More pesticide knowledge , please pay attention to China Pesticide Network

(Source: Good Agricultural Resources)

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