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DOI:10.13522/j.cnki.ggps.2021056 |
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Effects of Irrigation Amount on Dry Matter Production and Its Translocation in Greenhouse Green Pepper |
SHI Xiaohu, LI Chao
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1. College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. Beijing Leping Social Entrepreneur Foundation Kexin Farm, Beijing 100010, China
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Abstract: |
:【Background and Objective】The increase in solar-greenhouse green pepper production has exerted pressure on the limited water resources in Shanxi province of China. Understanding the effect of soil water on physiological traits of the pepper is essential to improving its water use efficiency. The aim of this paper is to experimentally elucidate the response of biomass production of the green pepper and its subsequent translocation to irrigation amount.【Method】The experiment was conducted from October 2018 to April in 2020 in a greenhouse at Xiaodian district in Taiyuan City. It has four irrigation treatments: sufficient irrigation in whole growing season, 50% deficit irrigation during the seedling stage, 50% deficit irrigation during the seedling and flowering stages, and 50% deficit irrigation in the whole growing season. In each treatment, we measured the dry matter change of each plant organ, from which we derived a model to calculate organ biomass using irrigation amount and photosynthetically active radiation (PAR). The model was validated against experimental data.【Result】The accumulative dry matter increased with the cumulative thermal time and differed significantly between different irrigation amounts. The dry mass of above- and below-ground organs predicted from the model was consistent with those experimentally measured with a standard error (RMSE) of 0.79~3.56 g/per plant. The mean absolute error (MAE) between the predicted and measured dry mass of stem, leaves, fruits and roots of per plant was 0.95~2.14 g, 1.25~2.95 g, 6.34~19.54 g and 0.54~1.10 g, respectively. The irrigation amount impacted on translocation of the dry matter to stems, leaves and fruits more significantly than translocation to roots. 【Conclusion】 The model we derived for estimating dry mass production and its translocation is reliable and can be used to help manage greenhouse green pepper production when fertilization is sufficient and irrigation is deficient. |
Key words: irrigation amount; greenhouse; biomass production; dry matter translocation; green pepper; model |
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