Phosphorus and potassium fertilizers to prevent diseases in fruit trees

Fruit trees

However, many farmers often tend to chase only nitrogenous fertilizers (such as urea and high-nitrogen compound fertilizers) during the Spring Festival, neglecting the application and supplement of phosphorus and potassium. Therefore, from the physiological needs of fruit trees and disease prevention technology, it is necessary to replenish the appropriate amount of P and K fertilizer 2-3 times in advance.

Phosphorus and potassium are good medicine for disease resistance of fruit trees. Proper application of phosphorus and potassium fertilizer can not only effectively prevent and control physiological diseases of fruit trees, but also prevent and control infectious diseases. Many diseases of fruit trees can be reduced by the application of phosphorus and potassium. Test data show that per mu (667 square meters) applied 25-40 kilograms of superphosphate, potassium chloride orchards of 5 kg, the incidence of rust fruit rust control effect is not less than the liquid Seoul.

The main reason that phosphorus and potassium can prevent physiological diseases of fruit trees is that some physiological diseases are caused by insufficient supply of phosphorus and potassium. Phosphorus and potassium can make fruit bark, cells harden, pathogenic bacteria and viruses inaccessible. At the same time, phosphorus can promote the absorption of silicon in fruit trees and enhance the disease resistance of fruit trees.

Phosphorus and potassium fertilizer applied to fruit trees

Fruit trees after the application of phosphorus, potash, the stem hard, better able to withstand adverse environmental conditions, effectively resist the infection of pathogens outside, so that the incidence of fruit trees reduced. In addition, phosphorus can also promote the respiration and oxidation of fruit trees to strengthen, when the invasion of pathogenic microorganisms in fruit trees, can produce some toxins to pathogenic microorganisms (bacteria) toxin. After the application of phosphorus and potassium fertilizer can also make diseased fruit trees to reduce the extent of water loss, compensation for pathogenic microorganisms caused by damage to nutrition and water loss in order to improve disease resistance.

Phosphorus, potassium, although a large number of essential elements of fruit trees and disease-resistant medicine, but not to cast as much as possible. If applied too much, resulting in waste, the growth and development of fruit trees also have a negative impact. If too much phosphorus is applied, it inhibits the absorption of certain trace elements (such as zinc, etc.) in the fruit tree, resulting in underdeveloped roots, reduced branches and a large amount of dead fruit.

Phosphorus and potassium fertilizers to prevent diseases in fruit trees

Therefore, in the mode of fertilization, selection of varieties, the amount of application, should be based on different varieties of fruit trees, different ages, different soil and other specific circumstances, to take the bottom facilities, top dressing, spraying different ways to choose varieties of diammonium phosphate, Calcium, potassium sulfate, potassium dihydrogen phosphate, potassium humate is excellent. Application due to age, amount of fruit to determine. The general application of high-quality phosphate 20-40 kg per acre, potassium 7-8 kg; foliar application of potassium dihydrogen phosphate 1% -3% of the better, the choice of pre-and post-flowering spray 2-3 times, 7 -10 days to conduct.

The above is the method of application of P and P for fruit tree disease prevention, fruit and fruit friends can refer to the above methods, combined with the actual planting situation, the scientific application of phosphorus and potassium to fruit trees.