What are the four laws of scientific fertilization?

Now with the development of agricultural economy, the application of fertilizer is increasing, although it has brought great benefits in the harvest of crops, but if the fertilization method is not scientific and unreasonable, it will be followed by the waste of fertilizer and crop fertilizer damage.

Fertilizer is an important agricultural input in agricultural production. Scientific fertilization can greatly increase crop yield per unit area and total yield. So how to do scientific fertilization? What do we need to pay attention to during the fertilization process? Now let's learn scientific fertilization measures.

Today, we will take a look at the four laws of scientific fertilization.

Nutrient return law

With the harvest of crops, it is necessary to take away a certain amount of nutrients from the soil, and with the increase of harvest times, the nutrient content in the soil will be less and less. If the nutrients lost by crops from the soil are not returned in time, not only the soil fertility gradually decreases, but also the yield will be lower and lower. Fertilizer should be applied to the soil in order to maintain the balance of elements and increase the yield.

We know that crops grow by absorbing nutrients from the soil, and every year we take away a portion of the harvest, that is, we take away a portion of the nutrients from the soil, and if we want to restore the soil, we have to return all the nutrients taken away to the land.

Everyone is very conscious of adding nitrogen, phosphorus and potassium, but few people add trace element fertilizer, so it will be more and more scarce, seriously limiting the increase in production.

To put it bluntly, this principle is "debt to pay money", and planting land must be fertilized.

Law of minimum nutrients

Crop nutrient demand, in addition to a large number of elements nitrogen, phosphorus, potassium, carbon, hydrogen, oxygen, but also other medium and trace elements, medium elements: calcium Ca, magnesium Mg, sulfur S, silicon Si (1%); Trace elements: Boron B, zinc Zn, Manganese Mn, copper Cu, molybdenum Mo, iron Fe, chlorine Cl (0.1%). Among these elements, indispensable, can not be replaced, the significance of the role is equally important, and the importance is not affected by the amount of demand.

If the different elements are regarded as the wood of the barrel, and the capacity is regarded as the yield, then the length of the shortest wood determines the yield of the crop. And for different crops, different soils, this shortest board is not the same. For example, rice may be silicon, peanuts may be calcium, other flowering crops may be boron, and these elements limit the increase in yield.

Crop growth requires a variety of nutrients, the relative crop yield depends on the amount of nutrients in the soil, especially the relative content of the least nutrients. For example, if a piece of land is very short of nitrogen and can only produce 500 pounds of grain, then even if there are a lot of other phosphorus and potassium, it is useless to produce 1,000 pounds, and the final output can only be 500 pounds. At this time, if you want to increase production, you can only apply nitrogen fertilizer, and increase the amount of nitrogen fertilizer to the level of 1000 jin, otherwise, even if more phosphate and potassium fertilizer is applied, not only can not increase production, but also may reduce production.

This principle is to remind us that fertilization should be targeted, and what is missing can be made up.

Law of diminishing returns

Under the premise of relatively stable production conditions, with the increase of fertilizer amount, crop yield will also increase. If the optimal fertilizer amount is reached, and then the fertilizer is added, the increased yield per unit fertilizer will decrease. That is to say, the amount of fertilization should be appropriate, avoid excessive fertilization, increase the cost, and can not achieve the effect.

It means that the more fertilizer the more yield, but the increase will be smaller and smaller. For example, when fertilization is low, applying more than 1 jin of fertilizer can increase the yield of 10 jin of grain, with the increasing amount of fertilizer, then applying more than 1 jin of fertilizer may only increase the yield of 8 jin of grain; Add more, it may become 6 catties, 4 catties or directly do not increase production.

This principle reminds us that fertilization should be limited, not the more the better.

Law of synthetic action

It means that crop yield is the result of a variety of factors, that is to say, seeds, water, fertilizer, temperature, light, field management and other work must be done to achieve high yield.

This principle tells us that fertilization should be combined with various measures, such as watering, ploughing, spraying, etc., in order to achieve the best results.