Where is the suitable place to cultivate ratooning rice? Which variety should I choose? How to grow high yield?

Now is the season for rice sowing and seedling raising, so farmers who want to grow rice should begin to choose varieties, and for some growers, it is better to choose ratooning rice, not only can they harvest two crops in one crop. and the rice quality of ratooning rice is very good, which places are suitable for planting ratooning rice? Which variety should I choose? How to grow high yield?

Areas suitable for planting:

1. Production conditions

Generally speaking, if mechanized harvesting is not adopted, ratooning rice can be developed in most areas. of course, double-cropping rice production is encouraged and ratooning rice can be developed in areas with insufficient light and temperature in two crops and more than one crop. If mechanized harvesting is adopted, mechanical rolling is inevitable, and the production of recycled rice requires that the field should be as large as possible, and there should be no slope between successive fields to reduce seedling damage. Small terraces in mountainous areas and low-lying fields with poor drainage are not suitable to develop mechanically harvested ratooning rice.

2. Variety growth period

Many varieties can be used as ratooning rice, but for high-quality middle and late rice varieties, their high temperature tolerance is not strong, and the quality of ratooning rice becomes worse in the first crop. on the contrary, it is not cost-effective to plant middle and late rice in terms of quality and benefit.

Ratooning rice with good varieties

The general principles are: moderate growth period, good tillering ability, strong high temperature tolerance in the first season, high seed setting rate, excellent quality, good stable yield and high yield, high head rice rate in ratooning season and so on.

Specifically, medium rice varieties with long growth period are generally cultivated as ratooning rice, but there is a risk that the quality of varieties with poor tolerance to high temperature is not good. At present, the new model of "early planting of late rice varieties + low pile harvest of ratooning rice" is advocated. The varieties with high seed setting rate and good quality under high temperature are selected in the first season, and the mid-mature varieties of late rice can be selected to sow early so as to complete the panicle in the first ten days of July and avoid the high temperature. The heat-tolerant mid-rice varieties with longer growth period should be selected for full heading in mid-July.

High yield planting techniques:

1. Seed pre-sowing treatment: Dongxiang wild rice with cold resistance and well-developed root system genes was selected as male parent, local late rice glutinous rice as mother tree, and "Heping rice" perennial rice seeds were obtained after repeated hybridization for many years. The seeds were dried for 1-2 days before sowing, and then soaked with medicament. after seed soaking, rinse with clean water after seed soaking, and then sprout.

2. Sowing: in the first ten days of May, the germinated seeds to be sowed will be sown in different beds in accordance with the standard of 12~13kg for dry seeds used in each 667m2 autumn field, and then step into the mud after sowing.

3. Seedling stage management: wetting in shallow water before seedling and irrigation in shallow water frequently after emergence; paclobutrazol per mu in two-leaf stage, rapid spraying with water and fine water to dwarf seedlings; application of hydrocarbon nuclear fertilizer compound fertilizer per mu in three-leaf stage: farm manure was applied 5-7 days before transplanting to bring fertilizer to the field, and 60g paclobutrazol per mu was used in the preferred two-leaf and one-core stage, and 100kg water was quickly sprayed with water to dwarf autumn seedlings. Carbon and hydrogen nuclear fertilizer compound fertilizer 10kg was applied per mu at the three-leaf stage.

4. Transplanting: transplant timely, the seedling age is controlled at 30 to 35 days, and transplant in time after the field is ready; the transplanting density is: 1.3 ~ 15000 holes per mu, planting with wide and narrow rows, 3 seedlings per hole, 3 seedlings per hole and wide and narrow rows, so that the rice seedlings can be fully exposed to sunlight and improve photosynthesis so as to facilitate ventilation and ventilation.

5. Water management: release water 2-3 days before planting, maintain 2-3cm thick water layer, ensure planting quality and favorable tillering; 20 days after planting, the number of seedlings reached 18-200000 seedlings of high-yield population, drainage and sun-drying (until cracking), control ineffective tiller; re-water fertilization at jointing stage to promote large panicle; maintain shallow water irrigation or alternation of dry and wet before harvest, moist or shallow water irrigation during harvest

6. Harvesting management: when rice is nine layers and five yellow, fine weather is selected in time to harvest, and small harvester is used in harvesting machinery, which is beneficial to returning rice straw to the field, and has little effect on rice pile damage and axillary bud damage. 8kg compound fertilizer is used to promote seedling emergence and axillary bud differentiation per mu after harvest, and small machinery is used to cut rice stump in mid-late October. Rice stump storage height is 20-25cm, rice straw is returned to the field, and shallow water is maintained for overwintering.

7. The first crop management: in the first and middle March of the second year, when applying bud-promoting fertilizer, basal fertilizer and tillering fertilizer were used at the same time, the amount of carbon and hydrogen nuclear fertilizer was reduced by 10kg, and lime nitrogen 1kg was added to promote early and rapid development. Rice was set as two-season rice, the first crop was harvested and bud-promoting fertilizer was applied, the first harvest was harvested at 9. 5% yellow maturity, the pile height was about 30cm; 15 days before harvest, 25-35 kg hydrocarbon nuclear fertilizer per mu was used, watering 2-3 times after harvest, and hydrocarbon nuclear fertilizer 10kg was used per mu in the breaking stage of recycled rice.