How is the proportion of pesticides calculated?

The misclassification of pesticides is a very painful lesson.

I was so afraid that I would die of the crop medicine. I was afraid of it. In the end, what should be the pesticide?

1. How much of the syrup that should be sprayed on an acre of land?

First we have to be clear:

The spray tank of the sprayer is generally 15 kg.

In most cases, it is enough to spray 2 cans per mu. If you feel that the pests and diseases are serious, you can spray more points as appropriate, but no more than 3 cans.

Second, look at the use of drugs, calculate and compare

Then we have to calculate according to the label on the drug label.

In order to facilitate the display to everyone, we use carbendazim as an example to calculate.

There is actually not much substantive content on the front. 50% of this is a big deal. It is a ratio that manufacturers can achieve when purifying carbendazim. It is guaranteed that at least 50% of this wettable powder is carbendazim, which is used to control the quality of the drug.

We still turn to the back to see. This is a multiple, it is gram, and what is the meaning of the drug ratio? Don't worry, we come one by one.

(1) The dosage of the preparation for fruit trees is 500-1000 times

This means that if the fruit tree is sprayed, 1 gram of this powder will be 500-1000 grams of water.

We have to match one can of this potion, which is 15 kg (15,000 g):

Approximately the amount of a certain agent (g) = 15000 (g) / dilution factor

15000/500=30 (g) 15000/1000=15 (g)

That is to say, we need to put 15-30 grams of this carbendazim on a can.

(2) The dosage of the preparation for wheat scab is 100 g/mu

This is convenient, one can and two cans, on average, a can of 50 grams, just water.

(3) For the cotton seed dressing 1:100 (drug ratio)

This is also a good calculation, the ratio of medicine is 1:100, which means that 1 kg of medicine can be mixed with 100 kg of cotton seeds. You need to mix a few pounds, and dividing by 100 is the amount of medicine you need. By the way, a few words, some of the seed coatings are written as "coating ratio 1:50", which refers to the weight of the drug: the weight of water = 1:50.

More pesticide knowledge , please pay attention to China Pesticide Network

(Source: Chengdu Nongshangtong)