One temperature. Sorghum is a thermophilic crop, which requires higher temperature during the whole growth period. A certain high temperature can advance young panicle differentiation, while low temperature can delay young panicle differentiation. This characteristic is called the temperature sensitivity of sorghum. Sorghum has different requirements for temperature in different growth periods. The low temperature of Z for seed germination is 6-7 ℃, the suitable temperature of Z is 20-30 ℃, and the high temperature of Z is 44-50 ℃. Sorghum seedlings are not resistant to low temperature and frost. The suitable temperature from seedling emergence to jointing stage is 20-25 ℃.
The vigorous growth period of sorghum is from jointing to heading, and the suitable temperature is 25-30 ℃. Too high temperature will accelerate plant development, thin and weak stems, early heading, small panicles and sparse yards. The temperature requirements from flowering to maturity are relatively strict. The suitable temperature for Z is 26-30 ℃. Low temperature will delay the flowering period, prolong the flowering process and affect pollination. In case of high temperature and summer drought, the seed setting rate will be reduced. The larger temperature difference in the grouting stage is conducive to the accumulation of dry matter and grain filling maturity.
Second, moisture. Sorghum has the ability to resist drought. It can resist not only soil drought, but also atmospheric drought. At the same time, sorghum has waterlogging tolerance, especially after booting stage. In case of continuous rainfall after heading, a certain yield can still be obtained without top flooding in a short time. The seedling stage accounts for about 10% of the total water demand in the whole growth period; The jointing booting stage accounts for 50%. During this period, if water is insufficient, it will affect plant growth and young panicle differentiation; The period from booting to flowering accounts for 15%. Insufficient water will cause "pinch neck", which is the critical period of sorghum water demand; Filling stage accounts for 20%; The mature stage accounts for about 5%. The rainfall of 400-500mm in the whole growth period can be evenly distributed to meet its growth needs.
Three lights. Sorghum is a light loving crop. In the process of growth and development, it is required to have sufficient light conditions. Insufficient light will delay growth and reduce yield, especially in the later stage, which will directly affect the dry matter accumulation of seeds. Sorghum is a short day crop. Shortening the light hours can lead to early heading and maturity, while prolonging the light will delay maturity. When Northern varieties are introduced to the south for planting, the light hours will be shortened and they will mature early.
We have been insisting on sharing Baijiu merchants. https://www.qdljjy.com Truly solve the problems you need