| The winter temperature of solar greenhouse plays a very important role in crop production.Appropriate temperature can ensure the safety of crops overwintering and off-season production in the greenhouse,so as to realize annual production.This study of sunlight greenhouse under different substrate root zone in winter heating and fan air heating,exploring the root system under the condition of electric heating temperature field change under different cultivation mode,air heating in the greenhouse internal temperature changes and the two heating methods on tomato growth,physiological,quality and yield,the effect of combination of Angle analysis of the effect of various heating mode of energy consumption and economic benefits,the main research conclusions are as follows:(1)‘Harvest(74-560)F1 hybrids tomato'was used as experimental materials,by setting the " Vine mounting pole + hot air heating "," Vertical lifting rope + hot air heating " two kinds of heat methods to proceed the treatment of local air heating,research under the condition of different hot air heating and cooperate with the agronomic measures to produce the influence of canopy temperature environment,as well as to the overwintering tomato plant growth,fruit yield and quality index.Results show that under the condition of low temperature in winter,two kinds of processing mode can improve the indoor temperature,the solar greenhouse of " Vine mounting pole + hot air heating " treatment is more beneficial to the improvement of the canopy temperature of local,the processing of tomato plant yield is the highest,reaching to 4.32 kg/plant,and energy consumption is 6.96 KW · h /plant,at the same temperature conditions,compare with " Vertical lifting rope + hot air heating" energy saving 36.6%.(2)Tests were performed on treatments without heating(CK)up to 22?,28? and 34?.The distribution of root temperature field at different temperature and its effect on growth and quality of soilless cultivated tomato were studied.The results showed that when using coconut bran as substrate,different heating temperatures could increase the average temperature in the center of the substrate to 22.4 ?,29.8 ? and 35.2 ? at night.Compared with the control group without heating,heating at 22 ? and 28 ? can significantly increase the yield of tomato plants,plant height,stem diameter,number of leaves,fresh quality of root stem,VC,soluble sugar,soluble solid,soluble protein,titratable acid and other quality indicators.The energy consumption of tomato plants treated at 22 ? was 11.33 kw ·h,which was significantly lower than 14.86 kw ·h treated at 28 ?.Combined with the yield comparison,the energy consumption output ratio(yield per plant/energy consumption per plant)at 22? is higher.(3)The steady heat transfer model of coconut bran substrate in soilless cultivation in solar greenhouse was established.The input conditions were ground and substrate surface temperature,and the boundary conditions were indoor air temperature,9:00 am internal temperature of the substrate as the initial conditions,analysis of the matrix of internal heat transfer process is described in mathematical language,through the internal environment of greenhouse conditions inside the substrate temperature environment is simulated.at the same time to the stationing of matrix measurement and comparison between the numerical and the simulation value results show that the night time between 8 PM-the next day,The simulation results fit well with the measured temperature results,and the overall trend is consistent.The temperature difference of heating center is around 1?,the temperature simulation can be accurate to predict the temperature change on the substrate to provide basis for heating of the substrate. |
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