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Yunnan has been planting rice for more than 4000 years, which can be divided into three rice-growing areas. 1. One-season rice area: including Nujiang, Dali, Lijiang, Kunming, Qu

Yunnan has been planting rice for more than 4000 years, which can be divided into three rice-growing areas. 1. One-season rice area: including Nujiang, Dali, Lijiang, Kunming, Qujing and other places, the sowing time is generally from February to April, and the harvesting time is generally from September to June. 2. Double-cropping rice areas: including Honghe, Xishuangbanna, Lincang and Wenshan. Early rice can be sown in June 5438+February, and late rice can be sown in July. 3. ratooning rice areas: including Xishuangbanna, Pu 'er, Honghe, Kaiyuan and other places. The sowing date is 65438+ 10 month, and one-season rice can be harvested from August to September, and ratooning rice can be harvested from 165438+ 10 month.

I. History of Rice Planting in Yunnan

Yunnan province has been planting rice for more than 4000 years, which can be divided into one-season rice area, double-season rice area and ratooning rice area.

1, one-season rice area

(1) includes Diqing, Nujiang, Dali, Lijiang, Zhaotong, Chuxiong, Kunming and Qujing, and the main rice producing areas around Kunming (Yiliang, Chenggong, Songming, Fumin and Jinning).

(2) Sowing time is mostly in February-April, and harvesting time is mostly in September-65438+1October.

2. Double cropping rice area

(1) is suitable for development in the valley areas of Yunnan Province where the altitude does not exceed 1500m, mainly including warm and humid areas such as Honghe, Dehong, Pu 'er, Xishuangbanna, Lincang and Wenshan.

(2) The sowing date of early rice is generally 65438+February, and that of late rice is generally July. The harvesting time of early rice is generally from June to July, and the harvesting time of late rice is generally165438+1October.

3. Area of ratooning rice

(1) mainly includes the areas where the light and heat conditions can't meet the planting demand of double-season rice (but there is room for planting single-season rice), including Xishuangbanna (Jinghong and Menghai), Pu 'er (Jinggu and Zhenyuan), Lincang, Dehong, Wenshan, Honghe, Kaiyuan, Jianshui and other counties and cities.

(2) The sowing time is mostly 65438+ 10 month, the harvesting time of one-season rice is August-September, and the harvesting time of ratooning rice is 165438+ 10 month.

Second, how many seasons are there in Yunnan's rice?

1. Rice maturity in Yunnan is related to local topography. In mountainous and plateau areas, 1 year is generally planted 1 season rice, and 2-3 seasons can be planted in other areas.

2. Rice likes to grow in an environment with high temperature, high humidity and short sunshine, and the requirements for soil are not strict, but paddy soil is more suitable for planting.

3. The lowest temperature of seedling germination is about 10- 12℃, and the suitable temperature is about 28-32℃. After entering the tillering stage, the daily average temperature is required to exceed 20℃. The suitable temperature for young spike differentiation is about 30℃, which will prolong the differentiation time of branches and spikelets when encountering low temperature weather.

4. The suitable temperature for heading stage of rice is 25-35℃, and the flowering stage is about 30℃. If the temperature is lower than 20℃ or higher than 40℃, pollination will be seriously affected.