| Response of pepper growth and nitrogen uptake to aerated drip irrigationin greenhouse |
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| DOI：10.7606/j.issn.1000-7601.2021.03.05 |
| Key Words: aerated drip irrigation soil aeration net photosynthetic rate nitrogen uptake yield and fruit quality |
| Author Name | Affiliation | | LEI Hongjun | School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China | | SUN Keping | School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China | | ZHANG Zhenhua | School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264039, China | | LIU Leilei | School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China | | YANG Hongguang | School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China | | PAN Hongwei | School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China | | JING Ming | Yellow River Water Conservancy Research Institute of Yellow River Water Conservancy Commission, Zhengzhou, Henan 453000, China | | XI Haipeng | School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China |
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| Abstract: |
| Taking ‘Kangda 301’ pepper as the test crop, a randomized block experiment was conducted with three factors and two levels: nitrogen (N) application rate (225 kg·hm-2 and 300 kg·hm-2),air void fraction (subsurface drip irrigation with conventional water and aerated water), and irrigation amount (965 m3·hm-2 and 1 609 m3·hm-2). Soil water filled pore space (WFPS), oxygen diffusion rate (ODR), oxidation\|reduction potential (Eh), physiological indexes of pepper growth (root activity, net photosynthetic rate, yield and quality) and N uptake and utilization of different treatments were systematically monitored. Results showed that compared with the control, the soil water filled pore space treatments decreased by 3.09%, and ODR and Eh increased by 11.28% and 7.85% significantly in aerated drip irrigation.Under the same irrigation amount and N application rate, the photosynthetic rate, root activity, yield, Vc content, and soluble protein content in aerated drip irrigation treatments increased by 12.97, 13.10 (P<0.05), 18.18 (P<0.05), 9.45, and 18.78% (P<0.05), respectively, and N uptake and utilization efficiency increased by 17.84% (P<0.05) compared to the control.In summary, aerated drip irrigation effectively improved soil aeration, promoted pepper growth, and enhanced N absorption capacity, and the combination of irrigation amount of 1 609 m3·hm-2, N application rate of 300 kg·hm-2, and air void fraction of 15% was the suggested scheme. |
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