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| DOI：10.13522/j.cnki.ggps.20170028 |
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| Optimizing the Soil Moisture Threshold for Scheduling Deficit Furrow Irrigation of Greenhouse Tomato Grown in Raised Bed With Film Mulching |
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YUAN Ningning, BAI Qingjun, ZHANG Mingzhi, YUAN Ying, ZHAN Han
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1.College of Water Resources and Hydropower, State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi’an university of technology, Xi’an 710048, China; 2. North China University of Water Resources and Electric Power, Zhengzhou 450000, China
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| Abstract: |
| 【Objective】Raised bed with film mulching has been increasingly used in greenhouse production. The purpose of this paper is to experimentally study the effect of soil moisture threshold required to schedule deficit furrow irrigation on fruit, plant growth, water consumption, yield and water use efficiency of tomato grown in wide raised bed mulched with plastic film.【Method】The experiment was conducted in a solar greenhouse with cultivar of anti-TY tomato “5102” as the model plant. We compared two treatments in which irrigation was resumed whenever soil moisture at seedling stage, flowering and fruit setting stage dropped to 50% or 60% of the field capacity, respectively. Keeping soil moisture at these stages not dropping below 70% of the field capacity served as the control (CK). Overall, there were seven treatments, each having three replicas.【Result】Water consumption varied significantly between treatments, but it increased as the plant grew in all treatments and peaked at flowering and fruiting stage. It was found that water deficit at fruiting stage impacted yield and water consumption most, while thirsting the plant at flowering and fruiting stage affected fruit setting most. Keeping soil moisture not dropping below 60% of the field capacity at flowering and fruiting stage improved fruit setting rate by 2.22%, while keeping soil moisture not less than 70% of the field capacity at flowering and fruiting stage gave rise to the highest fruit inferiority and root - shoot ratio, leading to a reduction in yield. In contrast, keeping water content at 60% of the field capacity increased water use efficiency and reduced fruit inferiority.【Conclusion】Overall, keeping soil moisture at 60% of the field capacity at seedling stage, and 70% at flowering, and fruiting - fruit setting stage significantly improved yield and water use efficiency (P<0.05). These results have implications for scheduling furrow irrigation of tomato grown in film-mulched raised bed in solar greenhouse. |
| Key words: film mulch; furrow irrigation; water deficit; greenhouse tomato; water use efficiency |
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