Effects Of Organic Matter Contents And Soil Moisture Contents On The Soil Physical Property And The Growth Of Pakchoi In Solar Greenhouse

Soil temperature is an important environmental factor to restrict greenhouse winter production. It is influenced greatly by soil structure and phases composition of the soil (solid, liquid and gas). Aggregate structure is the basis for good soil structure. Important components of organic matter– humus, can promote the formation of soil aggregate structure and greatly affect the heat capacity of the soil. Soil thermal properties effected greatly by soil moisture. In this experiment, different soil organic matter content and moisture content as treatments. By analyzed the differences of the soil structure, soil thermal properties and soil heat flux, to reveal how the two factors affect greenhouse ground temperature. To provide references for the studies on greenhouse soil temperature and greenhouse water and fertilizer management.The conclusions:1 The impact on greenhouse soil physical properties by different organic matter contentsSoil organic matter significantly impacted the content of aggregate, especially for the smaller size aggregate. The impact on larger aggregate is not obvious. Solar greenhouse in winter, with the organic matter content increasing, Soil thermal conductivity and thermal conductivity decreases significantly.With the organic matter content increasing, greenhouse 5cm deep soil temperature tended to increase. Soils with a high content of organic matter, big variations in surface temperature changing and deep soil temperature changing variation was smaller. With the increase of soil depth, extreme changing temperature of greenhouse in ground occurred at a later time. Diurnal became smaller. On cloudy day, greenhouse ground temperature diurnal changing became smaller. However, there were no differences between cloudy day and sunny day on the the appear time of extreme temperatures.With the organic matter content increasing, soil heat flux diurnal range change rate decreases gradually. In the phase of soil negative heat exchange, the soil organic matter content was low. Large negative heat exchange, The soil organic matter content was high. Obtained an opposite result. In the phase of soil positive heat exchange, the soil organic matter content was low, be the maximum value. The soil organic matter content was high, be the minimum. Similar trends in different soil layers. Compared with the upper soil, the appear time of negative and positive maximum heat exchange and the appear alternating time of positive and negative heat flux were both later. 2 The impact on greenhouse soil physical properties by different soil moisture contentsWith the increase of soil moisture, the liquid percentage of greenhouse soil was significantly higher. Solid phase is essentially kept the same. Heat capacity of the soil increased significantly. At first, the soil thermal conductivity rate increased significantly, and then began to decrease after increased to a certain extent. Soil thermal conductivity began to decrease after increased significantly to a certain extent.The results of greenhouse ground temperature changing showed that: With the increase of soil moisture, ground temperature gradually decreased; With the increase of soil depth, extreme changing temperature of greenhouse in ground occurred at a later time. Diurnal became smaller and soil moisture content impacted ground temperature smaller. Been a smaller amplitude day change soil heat flux.With the increase of soil moisture, the diurnal variation of soil heat flux rate increased gradually. In the phase of soil negative heat exchange, there was less negative heat exchange when soil moisture content was small. Been the opposite result when oil moisture content was big; In the phase of soil positive heat exchange, there was less positive heat exchange when soil moisture content was small. Got the maximum value of positive heat exchange when there was big soil moisture content. With the increase of soil depth, the appear time of negative and positive maximum heat exchange and the appear alternating time of positive and negative heat flux were both later. The soil heat flux diurnal variation was smaller. Soil moisture content on the impact of soil heat flux decreased.The extreme heat flux appeared rate earlier than soil temperature appeared.3 The impact on the growth of Pakchoi by different organic matter contents and soil moisture contentsWith the increase of soil organic matter content, there was little difference on Pakchoi leaves. A significant increased in fresh weight per plant. Chlorophyll content, Vc content and soluble sugar content were significantly increased. When organic matter content more than 2.82%, a significant increased in fresh weight per plant. Chlorophyll content, Vc content and soluble sugar content were increased, but not reached significant levels. That showed soil organic matter can significantly improve the yield of Pakchoi in greenhouse. Under a certain concentration level can significantly improve the quality of Pakchoi.With the increase of soil moisture content, Pakchoi leaf area, production and Vc content increased. It is showed that along with the increase of water content, soil temperature gradually decreased., and adequate water and cool conditions just meet the living habits of Pakchoi. When Soil moisture content of 70% -85%, been maximum leaf area, maximum yield and the highest Vc content. When the water content more than 85%, these indicators began to decline. Showed that in the production of Pakchoi in winter greenhouse, Too much soil moisture decreased the ground temperature a lot. Affected the yield and quality. Therefore, soil moisture was 70% -85% is the appropriate water content for Pakchoi greenhouse winter production.