Crop depends on the soil thermometer

Soil temperature is the temperature in the ground soil, mainly refers to the directly related to flowers and trees growth and development of temperature in the shallow ground. Soil temperature affects plant growth, development and the formation of soil. In the soil of various biochemical processes, such as biochemistry process caused by microbial activity and inanimate chemical process, the influence of soil temperature. Soil temperature and agricultural production has the following two aspects: the relationship between soil temperature affect crop growth and development. A certain period of time in a year in low or high temperature, often has a harmful effect on agricultural production. Crop seeds must be within the scope of suitable soil temperature before germination. General cold cereal crops, seed germination Mark Twain to an average of 1 a 5 ℃; Thermophilic crops for 8 to 10 ℃. Compared with the temperature influence on seed germination and emergence, soil temperature is much more directly. But the soil temperature with the terrain conditions, soil moisture, farming, and crop coverage while under the influence of change in the weather. General crop roots in the soil temperature begins to grow 2 a 4 ℃, 10 ℃ above root growth is more active, more than 35 ℃ when root growth. High soil temperature makes the plant roots group often accelerate mature, almost reach the root root lignification, reduces the absorption efficiency of root surface. Soil temperature is low, crop root water absorption is slow, when climate conditions suitable for transpiration, plant part is dehydration or water on the ground. Soil temperature is too low, often make DongZuoWu nie quarter or root produces cold injury, extend the length of time at low temperature and the speed of cooling and freezing and thawing are affect the extent of frost damage. Soil temperature affects crop physiological processes. Between 0 a 40 ℃, the flow of the cytoplasm speed according to the temperature. In the range of 20 a 30 ℃, temperature can promote the transfer of organic matter. Temperature is too low, affect nutrient delivery rate, hinder the crop growth. Within a 0 to 35 ℃, temperature can promote the breathing, but have less effect on the photosynthesis, so low temperature is advantageous to the crop carbohydrate accumulation in the body. The suitable soil temperature can also promote crops vegetative growth and reproductive growth. So the soil thermometer is indispensable, measuring the temperature of the soil to focus on the growth of crops.