Improper management in the later stage affects the yield of early hybrid rice in the later stage.

After transplanting early hybrid rice, cloudy and rainy weather is often encountered, so the early growth is slow and the development period is delayed. If the late management is improper, it is bound to affect the yield and quality. The management of early hybrid rice should pay attention to the five precautions in the later stage.

Early rice

Prevent dehydration prematurely. Hybrid rice has developed roots, luxuriant stems and leaves, strong ability to absorb water and fertilizer, especially after the booting stage of early rice, it is necessary to ensure the supply of fertilizer and water. After heading, the root system is aging day by day, under the premise of ensuring adequate fertilizer and water supply, increase soil air permeability, achieve alternation of water and air, support roots with gas, protect leaves with roots, and strengthen seeds with leaves. Early hybrid rice has the advantage of large panicle and many grains, and there is a secondary filling process. During the period from grain filling to yellow maturity of early rice, interstitial irrigation should be adhered to and water should not be cut off prematurely. Therefore, the water management filling period is mainly wet, and the wax ripening stage is mainly dry. The water is cut off 5 ~ 7 days before harvest, and the water should not be cut off too early.

Second, prevent greedy green late ripening. If the flag leaf of early rice is found to be drooping and hypertrophy in the later stage, it may be greedy for green and late ripening. In addition to drying the field with water, 250 grams of rice vinegar, 1 kilogram of calcium superphosphate or 100 ~ 150 grams of potassium dihydrogen phosphate per mu of paddy field can be used with 50 kilograms of water. Early rice foliar spraying was carried out at booting stage, early heading stage and filling stage, respectively, to straighten the flag leaves, improve photosynthetic efficiency and increase the seed setting rate and 1000-grain weight of early rice.

Three prevention of premature senility. Some early hybrid rice field fertilizer is not enough; some drying work is not done well, long-term irrigation, soil hypoxia is serious, affecting the root development of early rice. The dry-wet irrigation method was applied to these early paddy fields to sun up the fields in time at the end of effective tillering of early rice, promote root and control tiller, transform vegetative growth into reproductive growth, and play the role of rooting and strong culm. In addition, panicle fertilizer should be well applied. During the grain filling period, 100g ~ 150g potassium dihydrogen phosphate was sprayed on the leaves of early rice after 4: 00 p. M., once every two or three days, for a total of two or three times. this can prolong the life of functional leaves of early rice, prevent premature senescence and increase 1000-grain weight.

Fourth, prevent diseases and insect pests. Early hybrid rice has thick green leaves and luxuriant growth. the diseases and insect pests vulnerable to in the later stage are longitudinal leaf borer, rice planthopper, sheath blight, bacterial blight, rice blast and so on. Therefore, it is necessary to strengthen field inspection to prevent diseases and insect pests, especially after the heading of early rice. Early hybrid rice is most vulnerable to the third generation rice planthopper from booting stage to yellow maturity stage. When there are 1000 ~ 1500 nymphs of 2 ~ 3 instar per 100m, insecticides such as Cicada Powder and Ruijingte should be used in time.

Five anti-cut marks. The growth period of early hybrid rice is long, and it is easy to harvest, which affects the yield and quality of early hybrid rice. In order to ensure a bumper harvest of early and late rice, comprehensive measures should be taken instead of cutting green. Early hybrid rice is harvested when the grain is golden and mature. To ripen one hill and cut one hill can not only harvest early rice at the right time, but also do not affect the planting of late rice.