The formula for fertilizing rice with a yield of 450-550 kg per mu is as follows:
(I) Total amount and ratio of fertilizer application
Fertilization of nitrogen, phosphorus, potassium ratio should be 1:0.5:0.9 or so, the total is about: nitrogen 10 ~ 13kg, phosphorus pentoxide 5 ~ 7kg, potassium oxide 8 ~ 12kg.
(II) Fertilization plan
1 Base fertilizer:
(1) Organic fertilizer:
Normal early-season rice plants use 1,000 to 2,000 kg of fresh green manure or 500 to 1,000 kg of manure or 60 to 80 kg of commodity organic fertilizer; late rice can use early rice straw to return to the field as organic fertilizer (1/2 to 2/3 of returning rice straw for early rice) or Application of manure per acre 500 ~ 1000kg or commodity organic fertilizer 80 ~ 100kg; a rice rice per acre of 500 ~ 1000kg or commercial organic fertilizer 80 ~ 100kg.
(2) Fertilizers: 7-9 kg urea, 35-45 kg calcium magnesium phosphate, 4-6 kg potassium chloride, and 1 kg zinc sulfate.
2 Dressing
(1) Childbirth: urea 5 ~ 7 kg, potassium chloride 4 ~ 6 kg;
(2) booting stage: urea 6 ~ 8 kg, potassium chloride 5 ~ 7 kg;
(3) Heading date: potassium dihydrogen phosphate 0.2 kg plus urea 0.5 kg sprayed on water 50 kg to prevent premature aging.
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