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How to carry out extra-rice dressing in rice?
The extra-root fertilizer is generally best performed in the late growth stage of rice, and it is suitable for the heading stage, and can reach the initial stage of grain filling at the latest. This stage due to the decline in rice root activity, the use of foliar absorption of nutrients quickly and high utilization of the characteristics of the top dressing can be quickly added nutrients. Due to the low soil utilization rate of phosphate fertilizers, the effect of top dressing by roots is very good. Urea, potassium dihydrogen phosphate, calcium superphosphate, and grain treasure are good top-dressing materials. The time for top dressing is performed in sunny evenings and cloudy days. The flowering time of rice should be avoided (9:00 to 12:00 in the morning). The foliar dressing should pay attention to the solution concentration should not be too large, so as not to burn rice seedlings, especially superphosphate and urea should not be too thick. High-quality early rice can be top-dressed once every 7 days at the full-heading stage, with 150 g of monopotassium phosphate and 500 g of urea mixed with 75 kg of water per mu. Late autumn rice is warm and fresh, and there is a large temperature difference between day and night. The effect of top dressing is better. Normal nitrogen metabolism is normal or prosperous. The group with dark green leaves should not spray N fertilizer. Potassium dihydrogen phosphate can be recovered. For nitrogen-deficient and yellow-colored groups, it is better to apply nitrogen-phosphorus mixture.