Abstract

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Title:: Influence of Root Zone Heating on Seedling Environment in Solar Greenhouse By Carbon Crystal Electrothermal Film

Author(s):: HE Fen1; 2; HOU Yong1; 2; LI Kai1; 2; ZHANG Yuefeng1; 2; LI Zhenxing3; (1.Chinese Academy of Agricultural Engineering Planning and Design，Beijing 100125；2.Key Laboratory of Farm Building in Structure and Construction，Ministry of Agriculture and Rural Affairs，Beijing 100125；3.Hebei Yongqing Xing Sheng Agricultural Services Limited Company，Langfang，Hebei 065600)

Keywords:: solar greenhouse; carbon crystal electrothermal film; root heating; substrate temperature; air temperature

Abstract:: Taking heating cable，self temperature limiting heating strip and carbon crystal electrothermal film as the seedling root zone heating material，the effect of raising temperature was tested in Hebei Yongqing county and the variation and difference of air temperature and substrate temperature under different heating modes were studied.The results showed that there was little difference between the air temperature in the heating zone and non heating zone，and the temperature in the root zone has little effect on the upper air temperature of the crop；the average and minimum value of the night temperature in the heating zone was 2.5 ℃ and 3.1 ℃ higher than the zone without heating；the night substrate temperature could reach set value with carbon crystal electrothermal film，which were 3.4 ℃ and 3.9 ℃ higher than that of the non heating control area，and which was 1.6 ℃,1.2 ℃ and 2.1 ℃,0.2 ℃ higher than that of the heating cable and the self limiting thermo electric heating zone respectively.The heating homogeneity with crystal electrothermal film were better than the heating cable and self temperature limiting heating strip，and the minimum deviation of the substrate temperature was 0%-14.3%，the average value was 7.1%；the minimum deviation of the substrate temperature of the heating cable and the temperature zone of the self limiting temperature electric heating zone were 0%-17.4% and 0%-16.8%,and the average value were 8.2% and 7.9%.