Air temperature demand and physiological performance of Orchid growth and Development

The production and development of orchids, like other plants, is closely related to the temperature. From a physiological point of view, the critical temperature for the growth and development of orchids is-10 degrees, the initial temperature is 16Mel 18 degrees, and the optimum temperature for growth is 18Mel 28 degrees, that is to say, when the daily average temperature is below 10 ℃, orchids stop growing, and orchids basically stop growing between 1O-16 and orchids. When the temperature is stable above 16Mel 18 degrees, orchids will enter the normal growth and development.

When the critical temperature is below 10 degrees, the orchid basically does not absorb nutrients except a small amount of water, the respiration is obviously weakened, the ability of photosynthesis is greatly decreased, and the nutrients in the body are in a gel state. If the organic matter stored in the stem is used to maintain life activities, the orchid is basically dormant.

Between the critical temperature and the initial temperature (16 degrees), the orchid is in a semi-dormant state, the ability of absorbing fertilizer in the root is weak, a certain amount of water supply is needed, the nutrition in the body is in a semi-sol state, and the running capacity of conducting tissues such as ducts and sieve tubes is very weak. respiration is closely related to the temperature, showing a positive trend, and the energy consumed by respiration greatly exceeds the energy produced by photosynthesis. The longer the "warm winter" time (10Mel 16 ℃), the more nutrients accumulated in the orchid, the greater the contradiction of "people do not pay", and the weaker the cold resistance and stress resistance of orchids. (Wu Zongbin)