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| Effects of negative pressure irrigation on growth and water use efficiency of spinach |
| XIANG Yanyan1,2, HUANG Yunxiang1*, LONG Huaiyu3, YANG Leijing1, HUANG Huang1,YU Kang1, OUYANG Ningxiang1 |
| 1. College of Resources and Environmental Science, Hunan Agricultural University, Changsha, Hunan 410128, China; 2. Xiangxi Station of Soil and Fertilizer, Jishou, Hunan 416000, China; 3. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract In order to select a suitable negative pressure to growth of spinach(Spinacia oleracea L.)in Southern China, a pot experiment was conducted to investigate effects of three levels of negative pressure(-5.0 kPa, -10.0 kPa and -15.0 kPa)on spinach growth, physiological index, quality index, water use efficiency and nutrient uptake by using artificial irrigation as the control(CK). The results showed that the yield of spinach was 178.2 g/pot in -5.0 kPa treatment, significantly higher than that in -10.0 kPa or -15.0 kPa treatment, but without significant difference from CK. The underground biomass was 9.99 g/pot in -5.0 kPa treatment, significantly higher than that in CK and -15.0 kPa treatment. The root activity was 419.0 μg/g·h in -5.0 kPa treatment, which was significantly higher than that in CK, -10.0 and -15.0 kPa treatments, with increase by 65.3%, 51.5% and 91.0%, respectively. The vitamin C and soluble sugar contents were 50.72 mg/100 g and 1.74% in -5.0 kPa treatment, increased by 18.3%, 10.5%, 44.9% and 6.1%, 23.4%, 47.5%, respectively, comparing with CK, -10.0 kPa, and -15.0 kPa treatments. The water use efficiency was 3.89 g/kg in -5.0 kPa treatment, which was significantly higher than that in CK and -15.0 kPa treatment but had no significant difference from that in -10.0 kPa treatment. The cumulative absorption of aboveground nitrogen in spinach was significantly higher than that in CK, -10.0 kPa and -15.0 kPa treatments, and phospho-rus and potassium uptakes had no significant difference from CK, but significantly higher than that in -15.0 kPa. In terms of spinach yield and water use efficiency, the negative pressure water supply in -5.0 kPa is suitable to spinach growth in Southern China.
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Received: 13 May 2019
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