There is more to phosphorus fertilizer application than meets the eye: six precautions to remember

1. Do not fertilize every year. After phosphorus fertilizer is applied, crops in the current season generally can only absorb and utilize a small part of it, while its later effects can last for several years.

2. Apply phosphorus fertilizer early. Crops absorb phosphorus fastest at the seedling stage, which accounts for half of the total phosphorus absorbed during the entire growth period of the crop. If crops lack phosphorus at the seedling stage, it will affect later growth, and even if phosphorus is applied later, it is difficult to make up for the loss caused by early phosphorus deficiency. Therefore, attention should be paid to ensuring that crops do not lack phosphorus at the seedling stage.

3. Apply phosphorus fertilizer mixed with organic fertilizer. Mixing phosphorus fertilizer, especially calcium magnesium phosphate fertilizer, with organic fertilizer can transform the poorly soluble phosphorus in phosphorus fertilizer into available phosphorus that crops can easily absorb.

4. Apply phosphorus fertilizer in deep and shallow layers. Phosphorus fertilizer has low mobility in soil when applied in layers, so phosphorus fertilizer should be applied both in deep and shallow layers. Applying phosphorus fertilizer in the shallow layer is beneficial to the absorption of seedlings, thereby enabling crops to turn green earlier and tiller faster. For phosphorus fertilizer application, generally 1/3 is applied in the shallow layer and 2/3 in the deep layer.

5. Apply nitrogen and phosphorus together. Mix with nitrogen fertilizer. Crops absorb various nutrients in a certain proportion, and if the proportion is unbalanced, they will not grow well. Nitrogen and phosphorus should also be applied together, which can both balance nutrients and promote root growth, laying the foundation for a high yield.

6. Foliar spraying. When crops reach the late growth stage, the root system gradually ages and the ability to absorb nutrients weakens, often causing phosphorus deficiency. At this time, water-soluble superphosphate can be sprayed on the leaves of crops, allowing phosphorus fertilizer to enter the plant through the stomata or cuticle of the leaf surface. Wang Jihong