Winter amaranth and winter sunflower like cold and humid climate, which is not resistant to high temperature and cold, but resistant to low temperature and light frost, and low temperature can improve quality. The suitable temperature for plant growth is 15℃-20℃. The requirements for soil are not strict, but it is easier to yield in the soil with good drainage, loose fertility and water and fertilizer conservation, which is not suitable for continuous cropping.

Seeds began to germinate at 8℃, and the optimum germination temperature was 25℃. Plant diseases are serious above 30℃, and plants grow slowly below 15℃. Nitrogen fertilizer is the main fertilizer, which requires a large amount of fertilizer and has strong fertilizer tolerance. Suitable for planting in spring and autumn, easy-to-grow seedlings in summer, not suitable for open planting in summer.

Cultivation time:

Winter sunflowers can be cultivated in the open field in spring or autumn. Because of its weak heat resistance, it often dies in summer due to "seedling transformation", which is not suitable for summer cultivation. In the north of China, because the autumn temperature is too low, it is impossible to carry out overwintering cultivation in the open field, so spring sowing is suitable.

It can be carried out after the soil is thawed in early March. The sowing is too late, the temperature is too high, the light is strong, the growth speed is fast, and the crude fiber of winter sunflower increases, which affects the quality. Cultivation in solar greenhouse, sowing by stages, annual production. Generally speaking, harvest begins 60 days after sowing.

Refer to the above? Baidu encyclopedia-winter amaranth