1, anti-fatigue premature aging. After rice heading, if the nutrition is insufficient, the nitrogen content of the leaves is too low, which will inevitably result in poor grain filling, resulting in an increase in grains. Therefore, late management should pay attention to preventing premature aging of defertilizer. (1) Late rice fields with rapid yellowing of leaves before heading, applying 2 to 2.5 kg of urea per acre; (2) For late-season rice with normal growth, spraying 2 days before first panicle and 2 to 3 days after full panicle. 1 foliar fertilizer, 150 g of monopotassium phosphate and 500 g of urea per acre, and 40 to 50 kg of water per acre, sprayed on a cloudy or sunny evening; (3) sufficient nitrogen fertilizer and slow yellowing of leaf color In late rice, only 150g of potassium dihydrogen phosphate was used to spray the foliar fertilizer without adding urea.

2, prevent dehydration prematurely. Late dehydration of late rice will inevitably affect grain filling and ripening and reduce grain weight. Therefore, the field should maintain a half-month water layer after the late rice full-fledged, and then intermittently irrigated to achieve dry and wet, mainly wet, cut water 5 to 7 days before harvest, to ensure that the late rice raise roots and leaves for high yield . Physiological water requirement intensity and field water consumption of hybrid rice. In the period from heading to milking stage, it was significantly higher than that of conventional cultivars. The filling time was longer than that of conventional rice, and it was also characterized by "re-growing". Therefore, it was more sensitive to soil moisture than conventional rice. The so-called "re-growing" refers to the part of spikelets in hybrid rice. Even if it is not filled within 20 to 30 days after fertilization, its filling ability has not disappeared. When the conditions are suitable and the nutrition is improved, the grouting can continue to be solid grains. Therefore, preventing the late dehydration of hybrid late rice is more important than conventional rice.

3, cold weather. In the cold and rainy weather that Hunan encountered in the first half of this year, whether it was double-season late rice or late-season rice, its transplanting period was delayed by 5 to 7 days compared with previous years. This has increased the possibility of late rice encountering a “cold dew-wind” threat. Cold dew is the main meteorological disaster during the growth period of late rice. Its low temperature index is: daily average daily temperature of indica rice is less than 18°C ​​for 3 days, daily maximum temperature is lower than 21°C or minimum temperature is lower than 15°C (indicient temperature of indica rice is higher than that of indica rice 2°C lower). If the panicles cannot be safely harvested before September 10, the necking phenomenon will occur, causing heading and flowering to be blocked, and the empty space rate will increase, which will lead to a reduction in production. The “cold dew wind” at the filling stage will cause the grouting to be blocked or stopped, affecting the seed setting rate and the 1000-grain weight. . There are two effective ways to defend against “cold dew and wind”: one or two days before the arrival of “cold dew wind”, the field is filled with about 10 centimeters of deep water to improve the microclimate in the field. Immediately after the cold air is discharged, the second part is the spraying of millions of leaves. Twenty "90%" and appropriate amount of potassium dihydrogen phosphate, or per acre with "grain full" 1 package (50 grams) watered 35 to 40 kg sprayed. "Fruit Grain" is a foliar fertilizer developed by Hunan Agricultural University. It contains a variety of nutrient elements. Adding 0.8 g of "92" to each package has a unique effect on preventing and reducing the harm of "cold dew-curing".

4, prevent pests and diseases. The late-stage rice diseases and pests are mainly rice blast, rice smut, aphid, and rice planthopper. To control rice blast, use 40% rice bran oil per acre, 60 to 70 ml, and spray 30 to 40 kg of water; use 5% of Jinggangmycin to control rice muts, 200 to 300 ml of water, and 30 to 40 kg of water. Prevention and control of aphids, with 5% avermectin per acre 50 to 70 ml watered 30 to 40 kg spray; control of rice planthoppers, per acre with 10% imidacloprid WP 20 to 30 g Duishui 45 to 60 kg spray .

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