When to sow rice in Northeast China? An analysis of the best sowing time

Rice cultivation in our country has a long history, and it is grown in many regions across the country, but the sowing time for rice differs from region to region, so when should rice be sown in Northeast China?

1. When to sow rice in Northeast China

The rice grown in Northeast China is early-maturing single-season rice, generally sown in mid-to-early April each year, with the specific sowing time subject to the local climate. The rice-growing region for early-maturing single-season rice in Northeast China is located on the Liaodong Peninsula, north of the Great Wall and east of the Greater Khingan Mountains.

That is to say, the early-maturing single-season rice-growing region of Northeast China includes all of Heilongjiang and Jilin and most of Liaoning and northeastern Inner Mongolia, totaling 184 counties (banners, cities). This region also has two sub-regions: the Jilin Plain river valley extra-early-maturing sub-region and the Liaohe coastal plain early-maturing sub-region. The local rice area accounts for only 3% of the national total.

Low-temperature cold damage often occurs in the northern areas. The safe growth period for rice is about 100-120 days. During the growth period, sunshine is 1000-1300 hours and precipitation is 300-600 mm.

2. Cultivation techniques for rice in Northeast China

1. Pre-treatment

It is necessary to select excellent varieties with high yield, good quality and resistance to pests and diseases according to the local climate, such as Yanjing 47 and Liaoxing No. 1, then sun-dry the rice, and after repeated sun-drying, soak it in Zhongling or Junchongqing for disinfection.

2. Sowing

Choose suitable seedling ground and sow according to the standard of 200 g/m of wet seed sowing rate. For mechanical transplanting, use plastic soft trays or plastic hard trays for seedling raising, with a sowing rate of 125 g per tray. After pressing the seeds and covering with soil, carry out closed weed control.

Pay special attention to timely ventilation and cooling in high-temperature weather to prevent seedling burn from high temperatures. During the seedling stage, according to the occurrence of pests and diseases, select suitable pesticides to control seedling-stage pests and diseases, prevent pests and diseases from spreading into the field, and reduce the incidence of pests and diseases in the field.

3. Transplanting

Before transplanting, level the land, then apply compound fertilizer with 35% nitrogen, 100% phosphorus and 50% potassium. When the daily average temperature stabilizes at 15°C, the rice can be transplanted.

4. Fertilization and watering

According to the growth of the rice, carry out reasonable fertilization and watering. Generally, fertilization is done twice, once after the seedlings recover and once at the booting stage. The fertilization ratio is urea 10-15 kg/667 m, phosphate fertilizer 15-20 kg/667 m, potassium fertilizer 4-5 kg/667 m, zinc sulfate 1.5 kg/667 m.

5. Pest and disease control

When the rice is growing, pest and disease control is also needed. Be sure to detect problems promptly and apply the right remedy. Choose pesticides with high efficiency, low toxicity and no residue to ensure the healthy growth of the rice seedlings and a bountiful, high-yield rice harvest.