Effects Of Greenhouse Heat Storage And Air Supplementary Device On Soil Environment And Tomato Growth And Development

In order to solve the problems of low ground temperature and poor ventilation environment in root zone of solar greenhouse in northern China in winter,a heat storage and air supply pipeline was set up at 20 cm and30 cm below ridge surface,and no pipeline was used as control group.The effects on soil environment and tomato growth were compared and analyzed.The following conclusions are drawn from the experiment:The regenerative air-supply system can increase the soil temperature of different soil layers before and after planting,especially in the deeper position,which can be kept at about 17 ?,increasing 2.68 ?.However,working in bad weather will lead to the decrease of soil temperature.Ventilation at 20 cm can also alleviate the drastic change of soil temperature caused by room temperature,and make the temperature tend to be s Tablele.The device of regenerative air supply system can increase the oxygen gas integral of each soil layer from 10 cm to 50 cm,especially the oxygen gas integral of 30 cm to 50 cm.The maximum increase is8.94%.The ventilation effect at 20 cm is better.The device can inhibit the accumulation of carbon dioxide in root zone during tomato growth,reduce the volume fraction of carbon dioxide in each layer of soil,and keep it at about 0.5%,which is 96.97% lower than the control group.The device also affects soil enzyme activity and reduces catalase activity in different soil layers at different stages,while soil urease activity can be increased by more than 20% and urea nitrogen utilization efficiency can be increased.Tomatoes planted with heat storage and air supplement device can advance flowering by five days and fruit ripening by10 days earlier.The biomass,plant height and stem diameter of tomato increased,chlorophyll content increased by 18% in the middle and late stages,root activity and root protective enzyme activity also increased at the peak of tomato harvest,and the final yield per plant increased by about 30%.Therefore,the regenerative air-supplying device has the advantages of both heat exchange system and air-supplying system,and its cost is low,while the installation is simple.It can be widely used in solar greenhouse.