The 'learning' in the vegetable greenhouses

The temperature and humidity of the greenhouse agricultural adjustment have direct relationship with the growth of vegetable harvest. To do a good job of greenhouse agricultural winter temperature humidity mediation is particularly important, so choose a practical and effective thermometer is very important. Choose suitable greenhouse thermometer, that how to reasonably use? Listen to break down below: first of all, PengShi thermometer to hang in the plant more upside in different parts of the air temperature during the day and the height is related to the basic, especially plants flourish and high, due to the effect of shade of the branches and leaves, measured by the growing point to ground, the temperature drop gradient is very obvious. Average surface temperature than growing point in a 3 - low temperature The temperature 7 ℃, if the crop growing point in 34 ℃ or so, so subject branches in the temperature of the crop in the 27 - Between 30 ℃, the optimum temperature range in photosynthesis. Secondly, PengShi cultivation, covering plastic film, soil water supply, thus speeding up the crop leaf transpiration, reduced the leaf temperature, leaf temperature, usually 3 - lower than the air temperature 5 ℃, even if the air temperature high light suitable temperature 2 - obviously 4 ℃, the blade temperature is on the photosynthesis of the optimum temperature range. Again, raise the temperature within greenhouse agricultural, conducive to the improvement of ground temperature. If the temperature is low not only unfavorable to the growth and development of crop root, less lead to take root, the root absorbing ability is poor, low physiological activity, but also can cause a variety of physiological diseases occur, even roots rotted, death, and death caused crops. In general, 5 cm deep soil temperature during the day than low heat 5 - 7 ℃, 5 cm deep in the night soil ground temperature is higher than the temperature of 3 - 5℃。 To be, more than half a day time relative ground temperature below 20 ℃, melons, fruit vegetable crop root growth and development of appropriate soil temperature of 23 - 3-25 ℃ low 5℃。 To increase heat loss, can significantly improve the ground temperature, high temperature, can promote root development, increase root volume, improve the activity of root system, and promote root system to absorb moisture and nutrient elements, transformation and utilization. So as to promote the growth of crop growth, increase crop yield and quality. Winter temperature in greenhouse agricultural films should be control to the cap to add 2 - suitable for crop growth 3℃。 Grow vegetables is also a study, choose a good thermometer products is a top priority.