As a DAP Fertilizer Supplier, share with you. Appropriate application of phosphate fertilizer in phosphorus-deficient soil has a good effect on improving the yield and quality of crops. Some farmers' friends mistakenly believe that the more phosphate fertilizer is applied, the better. In fact, excessive application of DAP Fertilizer is not only useless, but also has many harms.
1. Excessive application of phosphate fertilizer will cause crops to absorb too much phosphorus nutrients from the soil
Excessive application of phosphorus fertilizer will cause crops to absorb too much phosphorus nutrients from the soil. Excessive phosphorus nutrition will greatly enhance the crop's respiration, which will consume the sugar and energy stored in the crop.
2. Induced soil zinc deficiency
Excessive application of calcium phosphate will cause the zinc in the soil to interact with excessive phosphorus, resulting in precipitation of zinc phosphate, which cannot be absorbed by the crop, which will cause obvious symptoms of zinc deficiency in the crop. Excessive application of alkaline phosphate fertilizers such as calcium, magnesium and phosphate fertilizers will cause soil alkali Chemical, reducing the effectiveness of zinc, affecting the absorption of zinc by crops.
3. Excessive phosphorus application will cause crops to lose phosphorus
According to research, after excessive application of phosphorus fertilizer, silicon in the soil will be fixed and cannot be absorbed, which will cause silicon deficiency in crops, especially for grass-like crops that like silicon. For example, if silicon crops like rice are not able to absorb more silicon elements from the soil, symptoms such as slender stems, lodging and poor disease resistance will occur.
4. Excessive phosphorus application will cause crops to be deficient in phosphorus and molybdenum
The proper application of phosphate fertilizer will promote the absorption of molybdenum by crops, but excessive application of phosphorus fertilizer will cause phosphorus and molybdenum to lose nutritional balance, affect the absorption of molybdenum by crops, and show "molybdenum deficiency."
5. Cause accumulation of harmful elements in the soil
Phosphate fertilizer is mainly derived from phosphate rock, which contains many impurities. These include harmful elements such as cadmium, lead, and fluorine. Moreover, the application of phosphate fertilizer will cause an increase in cadmium in the soil, with an annual increase of 0.15% and 0.08%, respectively, and this cadmium is highly effective and easily absorbed by crops, causing harm to humans and livestock.
Six, excessive application of phosphate fertilizer will cause deterioration of soil physical and chemical properties
Calcium superphosphate contains a large amount of free acid. If it is continuously applied in large amounts, it will cause soil acidification. Calcium magnesium phosphate fertilizer contains 25% -30% lime. Extensive application will increase soil alkaline and deteriorate physical and chemical properties.
What is the appropriate amount of phosphate fertilizer application? Generally speaking, even on phosphorus-deficient soils, the application rate per mu cannot exceed 40 kg, preferably 30-35 kg.
Our company also has Diammonium Phosphate on sale, welcome to consult.