Phosphorus is an essential element for the growth and development of crops. Appropriate application of P fertilizer in P-deficient soils has a good effect on improving the yield and quality of crops, but excessive application of P fertilizers is harmful and unhelpful.
Consuming sugar and energy stored in crops
Excessive application of P fertilizer will cause the crop to absorb excessive P nutrition from the soil and promote its respiration. For example, if rice absorbs too much phosphorus, it will increase the number of ineffective tillers, shorten the leaves, and reduce the production by early earing and maturation.
Induced zinc deficiency in soil
Excessive application of superphosphate, the formation of a large number of insoluble zinc phosphate in the soil, so that the crop showed significant symptoms of zinc deficiency; excessive use of alkaline phosphorus fertilizer such as calcium, magnesium, phosphorus, will make the soil alkaline, physical and chemical properties gradually deteriorated. Corn encephalitis, rice planting, etc. are the result of zinc loss from phosphorus in crops. At the same time, examples of phosphate can also inhibit the absorption of trace elements such as sulfur and copper by crops. Breaking the soil nutrient balance leads to poor crop development.
Phosphorus in crops is silicon
Silicon has a very positive effect on the growth and high yield of many crops. Silicon-bearing crop rice, if it can not absorb more silicon from the soil, will produce slender stalks, lodging and poor resistance to disease and other symptoms of silicon deficiency.
Phosphorus deficiency in crops
Phosphorus and molybdenum in the soil are very "friendly" under normal conditions and can promote each other and synergize each other. But too much is the use of phosphate fertilizers, often "strong phosphorus" phenomenon, and sometimes also cause losses to both sides, so that the crop can not absorb phosphorus and molybdenum.
Accumulation of harmful elements in soil
Phosphate fertilizers are mainly derived from phosphate ore. Phosphorus ores contain harmful elements such as cadmium, lead, and Buddha. According to foreign reports, the use of phosphate fertilizers will cause an increase in cadmium in the soil, causing harm to humans and animals. In particular, be alert to imported phosphate fertilizers.
What is the appropriate amount of phosphate fertilizer? In general, even if the soil lacks phosphorus, it should not exceed 40 kilograms per acre, preferably 30-35 kilograms. Phosphate fertilizer has a long aftereffect and can be applied once every 2-3 years.
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