Six cautions for phosphorus application

The main results are as follows: 1. After applying phosphate fertilizer year after year, the crops in the current season can only absorb and utilize a small part of them, while the late effect can last for several years.

2. Crops with early application of phosphate fertilizer absorb phosphorus most quickly in the seedling stage, accounting for half of the total phosphorus absorbed by crops in the whole growing period. if the crop is deficient in the seedling stage, it will affect the growth in the later stage, and it is difficult to recover the loss of phosphorus deficiency in the early stage even with supplementary application in the later stage. therefore, we should pay attention to the lack of phosphorus in the seedling stage of crops.

3. The mixed application of phosphate fertilizer and organic fertilizer, especially the mixture of calcium magnesium phosphate fertilizer and organic fertilizer, can transform the insoluble phosphorus in phosphate fertilizer into available phosphorus that can be easily absorbed by crops.

4. the stratified application of phosphate fertilizer in deep and shallow layers has little mobility in the soil, so phosphate fertilizer should be applied in both deep and shallow layers. The application of phosphate fertilizer in the shallow layer is beneficial to the absorption of seedlings, thus making the crops turn green early and tiller quickly. The application of phosphate fertilizer is generally applied in the shallow layer 1 to 3 and in the deep layer 2 to 3.

5. There is a certain proportion of all kinds of nutrients absorbed by crops with combined application of nitrogen and phosphorus and mixed application of nitrogen fertilizer, but it will not grow well if the proportion is out of balance. The combined application of nitrogen and phosphorus can not only balance nutrients, but also promote root growth and lay the foundation for high yield.

6. spraying crops outside the roots in the late growth stage, the root system gradually aging, the ability to absorb nutrients weakened, often resulting in phosphorus deficiency. At this time, the water-soluble calcium superphosphate can be sprayed on the leaves of crops to make phosphate fertilizer enter the plant through the stomata or stratum corneum of the leaves. Wang Jihong