What are the precautions for spraying foliar fertilizer on rice?
Timing is generally most suitable at the late booting, initial heading, grain filling and full heading stages of early rice, and spraying one mu once takes more than an hour. If spraying fertilizer coincides with the heading and flowering stage, it should be sprayed in the morning before flowering and after 4 p.m. Processed liquid fertilizers such as various quick-acting nitrogen, phosphorus and potassium fertilizers, monopotassium phosphate, triacontanol, borax,...
Timing is generally most suitable at the late booting, initial heading, grain filling and full heading stages of early rice, and spraying one mu once takes more than an hour. If spraying fertilizer coincides with the heading and flowering stage, it should be sprayed in the morning before flowering and after 4 p.m.
For processing liquid fertilizer, various quick-acting nitrogen, phosphorus and potassium fertilizers, monopotassium phosphate, triacontanol, borax, silkworm droppings and human and livestock urine can all be used as foliar fertilizer. The amount used per mu is not large, but they must first be processed into liquid fertilizer. Quick-acting chemical fertilizers should be dissolved in 5-10 times water the day before spraying to prevent excessive spraying from burning and killing rice leaves. Human and livestock urine should first be placed in a pit to decompose. For silkworm droppings, choose 10 times water to dissolve, filter after 24 hours, and then add enough water before spraying; borax should first be broken up, fully stirred with a small amount of water into a concentrated liquid, and then add enough water before spraying.
Spray fertilizer according to the symptoms based on the growth of the seedlings. For fields with green leaf color and uniform heading, spray a mixed phosphorus and potassium fertilizer. Use 0.25 grams of urea, 0.5 kilograms of superphosphate and 0.25 kilograms of potassium chloride per mu, add 60 kilograms of water and spray; or use 2.5-3.7 kilograms of decomposed cow urine and 1 kilogram of superphosphate per mu, add 60 kilograms of water. For fields with yellow-green leaf color, uneven growth and lean soil, spray mainly nitrogen fertilizer, combined with nitrogen and phosphorus.