The Insulation Properties Of Wide Shed And Steel Shed And Their Differences On Growth And Yield Of Tomatoes

This experiment studies the insulation properties of the wide shed and the steel shed under five kinds of weather conditions: sunny,snowy,cloudy,drizzly and overcast days. Using tomato Jingguan Wu Hao as the material, this experiment explores the variations of tomato growth and output between the wide shed and the steel shed. The main results are obtained as follows:1 The experiment selects the wide shed and the steel shed as cultural facilities and compares the insulation properties of the two sheds. The results are summarized as follows:1.1 The minimum temperature and average temperature in the two sheds are higher than those in the open field. The efficiency of the average temperature in sunny and cloudy days is more obvious than that in snowy,drizzly and overcast days. The average temperature in wide shed is higher than that in steel shed in sunny, cloudy, drizzly and overcast days. The minimum temperature in wide shed is higher than or equal to that in the steel shed, the temperature difference of wide shed is less than or equal to that in the steel shed, so the insulation effect of wide shed in sunny, cloudy, drizzly and overcast days is better than that in the steel shed. The insulation effect of two sheds hasn't been observed due to the shortage of heat in the snowy days. In general, the insulation effect in wide shed is better than that in the steel shed.1.2 According to the variation of daily temperature in the two sheds, the temperature in wide shed and steel shed is higher than that in the open field. The insulation effect in the wide shed is the best except that it isn't obvious in the snowy days. Viewing from the weather conditions, the rate of weather varies less in overcast, snowy and rainy days while it changes more in sunny and cloudy days.1.3 Viewing from the changes of vertical temperature in the two sheds: With the increase of soil depth, diurnal variation range becomes more stabilized while the change of soil temperature becomes more delayed. Change rate in sunny days is larger than that under the other weather conditions. Vertical temperature in wide and steel shed varies consistently and the wide and steel sheds are higher than T3. The insulation effect of vertical temperature in the wide shed is better than that in the steel shed.2 The growth and output of tomato plants in wide shed are better than those in steel shed, which embodies in the height of tomato plant and extending degree and chlorophyll content during the medium and the latter period; the stem diameter of tomato plant growth in the latter period and plant yield of tomato plants and other characters, which have reached significant or highly significant levels. The characters of tomato in wide shed is better. However, tomato plants, the number of tomato leaves, the content of soluble solids and pH value in the two sheds have no significant or extremely significant difference, which indicates there is no difference among three characters. Therefore, the growth and output of tomato plants in wide shed are better than those in steel shed...