Management techniques in the later stage of Honda Rice

I. Water-saving irrigation technology

Irrigation during rice growth period should adopt water-saving technology, and irrigation and drainage should be carried out according to the water demand characteristics and requirements of rice growth stages, which can be divided into deep water turning green, shallow water tillering, deep water booting and heading, diving maturity. In the period of returning to green, because the root of the seedling is damaged, the absorption of water is less, and the leaf evaporation is large, the seedling must turn green in deep water after transplanting. In order to prevent physiological water loss, the water depth is about 2 to 3 centimeters. If the irrigation is too deep, the nutrients decompose slowly, which is disadvantageous to the tillers; the booting and heading stage is the period when rice needs the most water in its life, especially in the meiosis stage, which is more sensitive to water. At this time, the lack of water will lead to the degeneration of spikelets, resulting in shorter spikes, fewer grains and more empty shells, so it is necessary to maintain a 2 cm water layer in the field during booting and heading stage.

II. Measures to prevent chilling injury

Rice encounters periodic low temperature and continuous drizzle. The water absorption of pollen is easy to break and the empty shell increases. If early frost occurs in early September, rice can not be milked normally. When the wind speed is too high, the rice organs are directly damaged and the empty grains are increased, which directly affects the seed setting rate of rice and reduces the yield.

Preventive measures:

1. Select good varieties with strong stress resistance, cultivate strong seedlings, increase silicon fertilizer, increase leaf toughness, promote root development, prevent leaf sagging, reduce shading, and create a good light environment. Improve stress resistance.

two。 At the heading stage of rice, pay attention to the weather changes. When the temperature is below 17 ℃, the water layer should be deepened by 15cm to 17cm, and the water should be kept warm. After the temperature rises, the original water layer will be restored to facilitate the normal ripening of rice.

3. Without affecting the yield, properly reducing the application amount of nitrogen fertilizer and increasing potassium fertilizer, starting from promoting flower fertilizer, applying at the same time at each leaf age can enhance the ability of rice plant to absorb potassium fertilizer, reduce side effects and increase grain weight. Increase the yield of rice.

III. Timely harvest

The time of harvest will directly affect the appearance quality, taste quality and yield of rice. If the harvest is too early, the grain is not fully mature, there are many blighted grains and green grains, the rice yield is low, the rice quality is poor, and the harvest is too late. Grain nutrient backflow, yield reduction, vulnerable to early frost, stem lodging, thick rice husk, dark and dull rice quality, etc., resulting in direct economic losses. Therefore, not being able to harvest in time has a great impact on the yield. When the ear axis dries up and down, 2/3 of the branches in the upper part of the ear turn yellow. The best harvest time is when the grains in the lower part of the ear are shaped and hardened.