Calcium Magnesium Phosphate Fertilizer Should Be Selected for Acidic Soils!

Recently, many farmers have asked: Is it reasonable to apply calcium magnesium phosphate fertilizer to acidic soils in orchards and tea gardens? Can superphosphate be applied? The author's answer is that it is correct to apply calcium magnesium phosphate fertilizer to acidic soils, and it is best not to apply superphosphate to acidic soils. Calcium magnesium phosphate fertilizer and superphosphate are two commonly used phosphate fertilizers. The vast majority of farmers are accustomed to using superphosphate (also known as single superphosphate), while calcium magnesium phosphate fertilizer is not used much. Especially, the application of calcium magnesium phosphate fertilizer in acidic orchards and tea gardens such as red and yellow soils has a better effect. Calcium magnesium phosphate fertilizer is an alkaline phosphate fertilizer and also a multi-element fertilizer. In addition to containing 14% - 20% of phosphorus pentoxide, it also contains 25% - 30% of calcium oxide, about 30% of silicon dioxide, and 15% - 18% of magnesium oxide. It has the best effect when applied to slightly acidic or acidic soils. When applied to calcareous soils, its fertilizer efficiency is poor because it is difficult to dissolve.

Advantages of Applying Calcium Magnesium Phosphate Fertilizer to Acidic Soils

First, it can neutralize soil acidity. Calcium magnesium phosphate fertilizer contains 14% - 20% of phosphorus, and it is an alkaline slow-acting fertilizer. It is insoluble in water, non-toxic, non-corrosive, non-hygroscopic, and does not cake. It is widely used in a variety of crops and acidic soils lacking phosphorus. The soil acidification in the southern region is relatively serious, with a pH value generally between 4.5 and 5, and the pH value of quite a part of the orchards is only a little over 3. In order to promote the growth of crops in orchards and tea gardens, the application of physiological acidic fertilizers must be controlled during fertilization to prevent the soil from becoming more acidic. At the same time, attention should also be paid to improving soil acidity. Excessively acidic soil is very unfavorable to the yield and quality of fruits and tea. And calcium magnesium phosphate fertilizer is a fertilizer that is alkaline itself. Therefore, it can neutralize the acidity of the orchard soil.

Second, the application of calcium magnesium phosphate fertilizer to acidic soils has a good fertilizer effect. Practice has proved that in acidic soils, the fertilizer effect of calcium magnesium phosphate fertilizer is better than that of superphosphate. The fertilizer effect of superphosphate is 100, and the fertilizer effect of calcium magnesium phosphate fertilizer is 108.6. Most of the soils in tea gardens in the south are acidic and strongly acidic soils. Therefore, the application of calcium magnesium phosphate fertilizer has a good effect.

Third, it is beneficial to increase production and improve quality. Applying calcium magnesium phosphate fertilizer to acidic orchards and acidic tea gardens can significantly promote the early ripening of fruits, the coloring of fruits, and improve resistance and storage resistance because this phosphate fertilizer contains a variety of nutrients such as phosphorus, magnesium, calcium, and silicon. Applying calcium magnesium phosphate fertilizer in tea gardens can significantly increase the content of catechin polyphenols and water extracts in tea, which is conducive to improving the aroma of tea. Calcium and magnesium can significantly increase the content of catechins, theanine, vitamin A, and vitamin C in tea. Especially when applying calcium magnesium phosphate fertilizer in acidic red and yellow soils, the effect of increasing production and improving quality is more significant. (Article source: China Agricultural Materials Guide Network)

At present, the high-grade phosphate rock resources used to make high-concentration compound fertilizers in China are gradually depleting. However, the reserves of low-grade phosphate rocks such as calcium magnesium phosphate fertilizer and superphosphate are quite abundant and await our development. At the same time, the slow and sustained effectiveness of calcium magnesium phosphate fertilizer can continuously supply nutrients to perennial crops such as tea and fruit trees. And a part of magnesium and calcium elements contained in calcium magnesium phosphate fertilizer are exactly the two secondary elements urgently needed by tea and fruit trees. Based on the general fertilization situation of tea gardens and the soil conditions, and taking advantage of the abundant calcium magnesium phosphate fertilizer resources in China, Hubei Yishizhuang Agricultural Technology Co., Ltd. has cooperated with the Tea Research Institute of the Chinese Academy of Agricultural Sciences to successfully develop a medium-concentration, full-nutrition, and multi-functional organic-inorganic special fertilizer for tea with calcium magnesium phosphate fertilizer as an auxiliary material. It has been widely used in tea planting areas and has achieved good economic and social benefits.