During the growth and development of pineapple, 300 times of potassium dihydrogen phosphate aqueous solution is poured every 15 days, and continuously infused for 8 to 10 times, each time 1.5 to 2 kg per plant is poured, and the ferrite is poured from the bell mouth at the top of the pineapple plant. The aqueous potassium hydrogen solution flows along the leaf axils to the soil around the roots. In this way, the pineapple plants grow robustly, the leaves are large and thick, and the green leaves are large. The flower buds are large, the fruits are large, full, correct, well developed, swollen quickly, lustrous, and the yield is obviously high.
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