Fertilizer application will not cause soil compaction

Professor Chen Lun-shou, senior advisor of Sinochem Fertilizer Agricultural University R&D Center, advises:

The application of calcium phosphate in the calcareous soil will form calcium sulphate, blocking the soil pores, resulting in soil compaction, which is the fact of the 1950s.

Now nitrogen fertilizers are mainly urea and ammonium bicarbonate, and their absence of secondary components will not cause soil compaction.

As long as organic fertilizers and chemical fertilizers are applied in combination, the increase in yield per unit also increases the number of roots and roots and does not make the soil compact.

Reporter: Prof. Chen often heard that “every year the application of chemical fertilizers will cause soil compaction.” Is this correct?

Experts: This statement is true in history. It is wrong to say so much now. In the 1950s, when New China was just established and the fertilizer industry was very underdeveloped, the nitrogen fertilizer used was imported ammonium sulfate. After the ammonium sulfate was applied to the soil, the ammonium ions were absorbed by the crop and most of the sulfate was left in the soil. , And can react with the calcium carbonate in the soil, producing a precipitate called calcium sulfate, commonly known as "gypsum." Calcium sulphate precipitation will plug the pores of the soil and cause soil compaction. Therefore, it is a historical fact that “every year the application of chemical fertilizers will cause soil compaction”, the farmers at that time had a deep understanding. There is also a reason for this: after applying chemical fertilizers, the decomposition of organic matter in the soil will be accelerated and the soil will be more compacted.

Reporter: Why is this argument incorrect now?

Experts: First of all, nitrogen fertilizers have undergone great changes. Nitrogen fertilizers are mainly urea and ammonium bicarbonate. Ammonium sulfate is rare in the market. After urea and ammonium bicarbonate are applied to the soil, nitrogen is absorbed by crops, and the rest becomes carbon dioxide and water, and there are no other components, so naturally it will not cause soil compaction. Furthermore, we advocate the organic application of organic fertilizers and chemical fertilizers. Organic fertilizers contain organic matter, which has the effect of loosening the soil, and of course it will not cause soil compaction.

Reporter: Professor Chen, if you do not apply organic fertilizer, the soil will be hardened?

Experts: The farmers themselves can answer this question. Due to the rational application of chemical fertilizers, the current crop yields are getting higher and higher. The yield of crops has increased. Of course, the number of root crops has also increased. As a result, there are many straws that are returning to the field, and humus is formed after decomposing the roots. It is an important material for soil reform. Therefore, as long as the rational use of chemical fertilizers is applied, even if organic fertilizers are not applied, the soil properties will be improved along with the increase in the yield of the crops. How can the soil be hardened? Of course, we do not approve of not using organic fertilizer.

Reporter: Prof. Chen, why are some farmers still thinking that after the lapse of 50 years, more fertilizer will be applied to the soil?

Experts: There are two possible reasons for my flash: First, the farmers are too impressed with the soil. Sometimes people say that the application of chemical fertilizers will result in the consolidation of soil. He also said that this is wrong. Second, some farmland soil texture is sticky, the surface is easy to crust after the rain, the farmers mistakenly believe that this is caused by the continuous application of chemical fertilizer, which is a misunderstanding.

Reporter: According to Professor Chen’s analysis in depth, peasant friends must have a new understanding. Later, I will not believe that the use of chemical fertilizers in successive years will cause soil compaction.

Experts: It should be remembered that as long as organic fertilizers can be used in conjunction with rational fertilization, the application of chemical fertilizers for many years will not result in the consolidation of the soil.

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