It is very cold in winter. What should I pay attention to when planting amaranth in greenhouse in winter?

Temperature requirements? Amaranth likes warm and humid climate and can withstand high temperature. 10- 12 germinates slowly, 14- 16 germinates quickly, and 22-24 is the fastest, but when it exceeds 36, germination and emergence will be inhibited. When the temperature is lower than 10 degrees or higher than 38 degrees, the growth is extremely slow or stops. Solar greenhouses in the northern region are planted in February and can be listed in the first half of April. Overwintering facility cultivation: 165438+ 10 solar greenhouse will be planted in the middle and late October, and it will be listed around the Spring Festival. Overwintering greenhouse cultivation can be sown from mid-June165438+February to June 65438+February, with the best sowing date in June165438+1late October, and the harvest time can be advanced to the next Spring Festival.

Amaranth varieties can be divided into round leaf species and pointed leaf species. Sharp-leaved species, such as Guangzhou willow amaranth, sharp-leaved red rice amaranth, sharp-leaved red amaranth, etc. Leaves lanceolate or oblong, sharp, fast growth, early maturity, low yield, poor quality and easy bolting and flowering. Sharp-leaf varieties should be selected for early-maturing cultivation in greenhouses and small arch sheds in our city, and varieties such as red amaranth, Dahongpao, white amaranth and willow amaranth should be selected from early June to early August, and varieties such as heat-resistant white amaranth, willow amaranth and red amaranth should be selected for summer and autumn cultivation.

Premature sowing, hot and dry weather, heavy rain and difficulty in seedling emergence should be covered with sunshade net. Sowing too late, 2 ~ 3 seedlings with real leaves will encounter cold current and be vulnerable to freezing injury. Spring sowing can be cultivated in solar greenhouse or plastic greenhouse, and delaying the market in advance is an efficient cultivation method. You can sow in the middle and late period of 1 1. Before sowing, water the soles of the feet, use 3-4 kilograms of seeds per mu, evenly mix the seeds with a proper amount of fine sand, spread them on the border, step on them with your feet or cover them with a layer of manure, and then cover them with plastic film. Then use a 2-meter-long bamboo pole to support a small arch shed 70-80 cm high.

Soil requirements? Amaranth has low requirements for soil and strong adaptability. Hard soil, wet soil, acidity and alkalinity are all suitable for its growth. However, for high yield, it is advisable to choose semi-sandy loam with deep and fertile soil layer and permeability from top to bottom.