What are the key measures to promote early ripening of rice
1. Harden seedlings early and grow strong seedlings. After the seedlings stand upright, begin small ventilation; after 1 leaf and 1 heart, gradually increase the ventilation amount so that the temperature is controlled at 20-25°C; at the 2-3 leaf stage, gradually switch to uncovering by day and covering by night. At this time, if there are few water droplets on the leaf tips in the morning and evening and the seedbed soil is dry, water thoroughly once, and combine with topdressing in the seedbed. Use 1.5...
1. Harden seedlings early and grow strong seedlings
After the seedlings stand upright, begin small ventilation; after 1 leaf and 1 heart, gradually increase the ventilation amount so that the temperature is controlled at 20-25°C; at the 2-3 leaf stage, gradually switch to uncovering by day and covering by night. At this time, if there are few water droplets on the leaf tips in the morning and evening and the seedbed soil is dry, water thoroughly once, and combine with topdressing in the seedbed. Use 1.5-2 grams of urea per sq m of seedbed, diluted 100 times for topdressing. Remove the shed film 3-5 days before transplanting. During the seedling stage, strictly prevent high-temperature spindly growth and seedling burning, and cultivate compact, robust seedlings, which helps rapid greening after transplanting and early tillering, and promotes early ripening.
2. Transplant early at the right time
May 15 to the end of May is the best period for rice transplanting in our city. Be sure to concentrate efforts to finish transplanting during the best transplanting period, and it is best not to transplant June rice.
3. Scientific irrigation and regulation according to seedlings
Throughout the entire growth period of rice, irrigation should mainly be shallow, which helps raise water temperature and soil temperature, and regulate temperature and air with water. During the tillering stage, keep a shallow water layer of one cun to preserve tillers; after tillering, drain water to promote rooting; after full heading, irrigate intermittently, combining dry and wet, to nourish roots and promote leaves. In the early stage, irrigate and drain less, with steady water irrigation; in the middle and late stages, irrigate and drain heavily, with flowing water irrigation. For rice grown with well water, water should be sunned before irrigation to raise water temperature and promote early ripening.
4. Topdress with greening fertilizer
5-7 days after transplanting, topdress with greening fertilizer at the right time to help the paddy field green quickly and tiller early. Generally, topdress 7.5-10 kg of urea or 10-15 kg of ammonium sulfate per mu. In the middle growth stage, according to the growth of the rice, appropriately topdress with jointing fertilizer and ear fertilizer, together with potassium fertilizer, to improve plant resistance and promote early ripening and high yield of rice.
5. Apply plant growth regulators
1-2 days before transplanting, spray 5 kg of 10 ppm rooting powder solution per 10 sq m, which helps rapid rooting and early greening after transplanting; during the rice growth period (around August 15), plant growth regulators can be sprayed to increase grain filling and increase the speed of nutrient transport to the ear, which helps early ripening of rice.
6. Reasonably control ineffective tillering
In the period when effective tillering of rice ends, mid-to-late July, deepen the water layer in the paddy field from 1-2 cun to 3-4 cun for deep-water tillering control, to prevent ineffective tillering growth in the later stage, concentrate nutrients for effective tillers and ears, improve grain plumpness, avoid frost damage and yield reduction in the late growth stage, and promote early ripening.
7. Carry out manual weeding in time
After chemical weeding, some weeds still survive in the paddy field. Organize manpower to eliminate the remaining weeds early, and cut clean the weeds on field ridges and water channels, so as to facilitate ventilation and light penetration in the paddy field and promote early ripening and high yield of rice.
8. Control rice blast. Focus on controlling ear-neck blast. From mid-July to early August, spray twice at an interval of 7-10 days for preventive control. The main chemicals are commonly used agents such as prochloraz, new kasugamycin, isoprothiolane (Fuji No. 1), kasugamycin, and tricyclazole.
9. Drain the field early
Generally, drain the field to dry in the middle stage of yellow ripening (early September); low-lying fields can be drained appropriately earlier. This ensures rice maturity and also creates convenient conditions for harvest. Harvesting later at the right time can ensure the rice matures more fully.