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DOI:10.13522/j.cnki.ggps.2020645
The Effects of Root-zone Restriction on Water Consumption and Fruit Quality of Greenhouse Muskmelon under Mulched Drip Irrigation
MENG Jian, LIU Shengyao, FAN Fengcui, NIE Lanchun,LI Yan, HOU Dashan, WANG Jing, HAN Jiangwei
1. College of Horticulture, Hebei Agricultural University, Baoding 071001, China; 2. Hebei Agricultural Technology Popularization Station, Shijiazhuang 050022, China; 3. Institute of Agricultural Information and Economic, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, China; 4. Shijiazhuang Academy of Agriculture and Forestry Sciences, Shijiazhuang 050021, China; 5. Shijiazhuang Agriculture Technology and Popularization Center, Shijiazhuang 050051, China
Abstract:
【Background】Improvement in living standard has shifted the demand of people for foods from quantity to quality. Given that roots not only anchor crops but also take up nutrients from soil to sustain crops growth, it has been conjectured that managing root growth and development could be an effective way to improve food nutrition while in the meantime reducing agrichemicals leaching and mitigating soil salinization in irrigated fields. Root restriction is one of such technologies, but inappropriate root restriction could impede reproductive growth of the crops, thereby reducing dry matter accumulation and leading to a decline in yield and food quality. Efficacy of root restriction is thus crop-specific.【Objective】Taking muskmelon as an example, this paper aims to experimentally find an optimal root zone restriction that can constraint unnecessary root growth while in the meantime improving water use efficiency and fruit quality of the muskmelon.【Method】The experiment was conducted in a greenhouse and we used the cultivar Xizhoumi 25 as the model crop. Roots were restricted to grow by placing gauze or plastic mesh at a depth between 10~60 cm, with no root restriction as the control (CK). In each treatment, we measured the water consumption, dry matter accumulation, yield and fruit quality of the muskmelon.【Result】Compared with the CK, restricting root growth by the gauze mesh did not affect dry matter accumulation, yield and appearance of the fruit at significant level, as opposed to the plastic mesh that significantly reduced dry matter accumulation, yield, transverse and longitudinal size of the fruits, as well as fruit shape index. Placing the gauze mesh at depths of 10 cm and 20 cm increased water use efficiency by 10.90% and 5.47% respectively, while replacing the gauze mesh by plastic mesh increased the water use efficiency by 8.06% and 4.39% respectively. Burying either mesh too deep resulted in a significant decrease in water use efficiency, suggesting that the depth of the root restriction mesh had an impact on fruit nutrition. It was also found that placing the gauze mesh at depths of 10, 20 and 30 cm, or the plastic mesh at the depths of 20, 30 and 40 cm, significantly increased the contents of soluble sugar, soluble solids and acid sugar ratio of the fruits.【Conclusion】For muskmelon grown in greenhouse, placing a gauze mesh at a depth between 10~20 cm to restrict its root growth did not have a significant impact on its vegetative and reproductive growth but could effectively improve its water use efficiency and fruit quality.
Key words:  muskmelon; root zone restriction; water use efficiency; fruit quality; mulched drip irrigation