At present, rice is in the jointing and booting stage, and the growth of rice in this period has a great influence on the grain weight and yield in the later stage. Zhao Quanzhi, director of the Henan Provincial Rice Professional Committee and a professor at Henan Agricultural University, said that the central task of management at this time is to achieve a large number of large spikes, strong stalks and anti-fall, and strive for grain weight. He particularly emphasized the need to apply panicle fertilizer: "The application of panicle fertilizer in advanced rice producing provinces has become an important technical measure for capturing high yields and is widely used in production. However, in the rice production in our province, the method of 'one shelling' is generally adopted. There is very little ear fertilizer, which is not conducive to the goal of large grain and multi-grain, which affects the yield of rice."
At present, the rice ear differentiation in the southern Henan rice area has entered the final stage, and the topdressing plan should be formulated according to the situation of the seedlings. For the field with pale leaf color, 3 to 5 kg of urea and 2 to 3 kg of potassium chloride can be applied per acre to promote the stalk thick and long ears. Rice along the yellow rice area has just entered the booting stage, and the application of panicle fertilizer is of great significance in promoting long and large ears. However, the application of panicle fertilizer should be carried out flexibly according to the leaf color and phase of rice. For the field where the number of tillers has reached the high yield index and the leaf color is normal, 5 to 6 kg of diammonium can be applied per mu at the end of July; for the field where the leaf color is thick or the number of tillers has exceeded the high yield index, it can be in August. In the first ten days, 5 kilograms of diammonium was applied per acre; for the field where the leaves are luxuriant, the green is covered, and the number of tillers exceeds the high yield index, no fertilization is required.
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