The mixed application of agriculture and forestry water retention agent and fertilizer turns out to

Presently.

The annual nitrogen fertilizer dosage in China is:25 million tons

The amount per unit area is three times the world average.

But the utilization rate is only

It is well below the level of 50% to 55% in developed countries.

It is estimated that the annual loss of nitrogen fertilizer in China is as high15 million tons, a large amount of nitrogen that is not absorbed and utilized by cropsStrandedAdsorptionDenitrificationand other ways to produce a series of serious harm to the environment, threatening the health of humans and animals.

Therefore,Improve the utilization rate of fertilizersminusLight or free of fertilizer pollutionThe development of sustainable and efficient agriculture is an urgent problem to be solved in China's current agricultural development.

In recent years, it has become more and more familiar to farmers.

and used in crop cultivation.

Its role is in addition to the main hit"Water retention and drought resistance".Outside.

It is rumored that there are some"Fertilizer-preserving" effectIt can improve fertilizer utilization

So. Agricultural and forestry water retention agent

Can it really maintain fertilizer and improve fertilizer efficiency?

I'm going to take you to ** today!

In 2010, Zhongkai College of Agriculture and Engineering, together with the wolfberry product quality supervision, inspection and testing center of the Ministry of Agriculture, adopted agricultural and forestry water retention agentsIndoor simulation testThe volatilization and leaching loss of ammonia in fertilizer under the condition of applying water-retaining agent were studied, and the mechanism of reducing nutrient loss by water-retaining agent was studied.

The final test results are as follows.

The loss of nitrogen in dryland soils mainly comes from the ammonia volatilization and leaching loss of nitrogen. After urea is applied to the soil, it is quickly dissolved and hydrolyzed under the action of urease, and the ammonia concentration in the soil is very high, which can easily cause ammonia volatilization loss in a short time.

And adding a water-retaining agent to the soil is different from applying urea alone, due to:The water-retaining agent can effectively absorb urea molecules and hydrolysates NH dissolved in the soil solutionThe former process has the potential to delay the hydrolysis of urea, while the latter process has the potential to directly reduce the loss of ammonia volatilization. The results in Figure 1 below support this inference.

As can be seen in Figure 1 below, the soil moisture content is 75% or 100% of the field water holding capacityThe addition of water-retaining agent to the soil can reduce the volatilization accumulation of urea ammoniaAnd with the increase of the amount of water retention agent, the amount of ammonia volatilization accumulation decreased significantly.

Nitrogen leaching loss is another major route of nitrogen loss, and it can also easily cause pollution of underground and surface water. The graph below shows the cumulative leaching of nitrogen from fertilizer nitrogen in soil.

It can be seen that the leaching of nitrogen in different treatments increased significantly with the increase of incubation time and leaching times.

The nitrogen leaching amount of the treatment with human water retention agent was significantly lower than that of the treatment without water retention agent, and the leaching loss decreased significantly with the increase of the amount of water retention agent.

To sum up. After applying a water-retaining agent to the soil.

It can significantly reduce urea ammonia volatilization and leaching loss.

It has the effect of improving fertilizer efficiency.

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Note: The experimental data of agriculture and forestry water retention agent products shown in this article are derived from Du Jianjun, Wang Xinai, and Gou Chunlin. Effect of water-retaining agent on soil nitrogen loss and its environmental effects].