What does it mean that herbicides have a saying of 3 hits and 3 don t hit ?

Herbicides are all need to be played, but the herbicides are all highly valued, if you play well, the expected effect is self-evident, and the weeding effect is obvious, if you don't play well, not only the weeds can not die, but also very easy to cause fertilizer. What should I pay attention to when spraying herbicides? At the beginning, it is to fight big and not small, until the weed develops a little bit, if it is a particularly small weed, the contact area between the weed and the potion is too small, which is not conducive to the death of the weed.

However, if it looks too big to be easily defeated, it is generally better to take the medicine in the case of weeds 2 4 leaves.

In addition, in the case of spraying, it is not necessary to spray the spray when a few weeds have just occurred, most of them reach the ground, and then they will evaporate, and the weeds that grow on the side after a few days are completely fine. Therefore, it makes sense to wait until the weeds look the same, as the expected effect will be stronger. In the end, it is necessary to look at the seedling condition under the premise of spraying, if the seedling condition in the field is not good, and the ambient temperature is still relatively drought, it is best not to spray, why?

In fact, due to the drought in the field, the weeds are in a dry condition, and because they can ensure moisture, they will close the pores on the face, so the expected effect of the herbicide will not be very good, because it will not cost much to digest and absorb at all.

What do you need to pay attention to to the herbicide, the first thing to pay attention to is that in the case of the liquid, you can not use turbid water, it is best to use the secondary dilution method, which can make the medicine dispersed and symmetrical, the sprayer should be relatively humid, the inhalable particles are particularly large, the leaves are not very good, it is very easy to cause the medicine to drip, the inhalable particles are too small, the volatile effect of the medicine is very prominent, and then the drug power is reduced. The greater the organic matter content in the soil, the greater the drug absorption, so the different soil stratification, the drugs used are different, the soil acidity and alkalinity are harmful to the stability of herbicides and the absorption of green plants to pharmaceutical preparations.

The first point is that there are three seasons that cannot be played, but the three seasons are also to be played, and the method of playing in different seasons is different, so we must pay attention to the methods and skills, and the second point should master its set of plans, so that we can play very well

If the weeds are small, the area of the weeds in contact with the liquid medicine becomes smaller, which is not conducive to the death of weeds.

If the weeds are small, the area of the weeds in contact with the liquid medicine becomes smaller, which is not conducive to the death of weeds, and the most obvious situation is ** or the effect is not good. Dense not thin, wait for the weeds to grow almost, a little dense before spraying, here is said to be dense, not big. Killing or not drying is actually to look at the moisture in the ground, the moisture in the ground is not good, when the weather is relatively dry, try not to spray.

If the ground is dry and the weeds are short of water, in order to retain moisture, their pores will be closed, so that the liquid medicine will not absorb much, resulting in a situation where the effect of the medicine is average and the weeds do not die.