Guava has less sugar, low sweetness, sweet taste, not brittle meat, easy to hollow, and is particularly serious due to anthrax, which is closely related to the lack of supply of phosphorus, potassium, calcium and magnesium fertilizer. If the phosphorus, potassium, calcium and magnesium fertilizers are added in time during the summer flowering of guava to ensure sufficient supply of phosphorus, potassium, calcium and magnesium fertilizers, these phenomena will not occur, so that the fruit is sweet, the flesh is crisp, the fruit is not hollow, and the anthracnose is not bad. fruit. The specific practices are as follows:
When buds begin to appear in summer, the roots are applied with phosphorus, potassium, calcium and magnesium fertilizers. Each plant applies 2 to 3 kg of superphosphate or calcium magnesium phosphate, 0.5 to 0.75 kg of magnesium sulfate, 0.25 to 0.5 kg of potassium sulfate, 0.75 to 1 Kilograms of NPK (15-15-15) potassium sulphate or sulphur sulphate or pure sulphur based compound fertilizer. Around the canopy drip line, dig deep and wide annular grooves of 25-30 cm each, mix all the fertilizers thoroughly and spread them in the annular groove, cover the soil.
At the same time, spray the 800-1000 times Xingpeng Phosphate Potassium No.1, 800-1000 times Starpowder Calcium and Magnesium No.1 mixture, or 0.1% magnesium sulfate, 0.3% potassium dihydrogen phosphate, 800 times every 10-15 days. Chelate the calcium mixture and spray it continuously for 3 to 5 times. Evenly spray all the branches, buds and fruits inside and outside the canopy, and it is advisable to start dropping the drops of water, and add phosphorus, potassium, calcium and magnesium fertilizer from the leaves.
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