Growth and quality of greenhouse tomato under cycle aerated subsurface drip irrigation
Lei Hongjun1,2, Zang Ming1,2, Zhang Zhenhua3, Liu Xin1,2, Xu Jianxin1,2,Pan Hongwei1,2
1.School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; 2.Henan Key Laboratory of Water-Saving Agriculture, Zhengzhou, Henan 450045, China; 3.Institute of Geography and Planning, Ludong University, Yantai, Shandong 264025, China
Abstract：Aerated subsurface drip irrigation refers to a kind of crop irrigation method in which aerated water is ejected into the root zone of a plant by using subsurface drip irrigation(SDI)system. It can enrich air content in the water significantly and eases temporal hypoxia in the root zone of plants in clayey soil under SDI system, subsequently increases crop productivity. The effects of aerated subsurface drip irrigation on growth, yield, and quality of greenhouse tomato are investigated by using yellow clayey soil in Zhongmou County, Henan Province. Compared with the control treatment, the crop water use efficiency(WUE)in the aerated treatment is increased by 20.72%, the fruit yield is improved by 29.15% at the first five harvests, and the harvest date is moved up under the same irrigation quota. Also, the stomatal conductance of tomato is raised by 30.51% and the plant vigour is enhanced. The viteamin V content, soluble solid and sugar-to-acid ratio are increased by 13.25%, 8.62% and 22.05%, but the total acid content and fruit rigidity are decreased by 15.50% and 11.19%, respectively, suggesting the quality of tomato has been improved greatly. Furthermore, the longest root length is increased by 16.75% and the root-to-canopy dry weight ratio rises by 25.81%. The results suggest the aerated subsurface drip irrigation can promote tomato plants to grow in the yellow clayey soil in green houses, to speed the mature process of fruit, to increase the yield of crop and to improve the quality of tomato.
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