| Effects of regulated deficit irrigation and nitrogen application on growth, yield and water-nitrogen use of peanut |
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| DOI：10.7606/j.issn.1000-7601.2018.05.27 |
| Key Words: regulated deficit irrigation peanut water and nitrogen interaction yield water-nitrogen use |
| Author Name | Affiliation | | HU Jia-qi | College of Water Conservancy, Shenyang Agricultural University, Shenyang， Liaoning 110161, China | | XIA Gui-min | College of Water Conservancy, Shenyang Agricultural University, Shenyang， Liaoning 110161, China | | ZHANG Bai-lun | College of Water Conservancy, Shenyang Agricultural University, Shenyang， Liaoning 110161, China | | ZHANG Yan | College of Water Conservancy, Shenyang Agricultural University, Shenyang， Liaoning 110161, China | | CHI Dao-cai | College of Water Conservancy, Shenyang Agricultural University, Shenyang， Liaoning 110161, China |
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| Abstract: |
| A field experiment was conducted to assess effects of RDI and nitrogen coupling on growth, yield and water-nitrogen use efficiency of peanut Baisha 1016 in the whole growth stage of peanut for mitigating yield decline caused by drought and explore the feasibility of regulated deficit irrigation(RDI) in the semi-arid region of western Liaoning province. The main plot was nitrogen with four levels, N0(0 kg N·hm-2), N1(40 kg N·hm-2), N2(60 kg N·hm-2), and the subplot was the water deficit (severe deficit-W1, 45% of field capacity; moderate deficit-W2, 55% of field capacity; light deficit-W3, 65% of field capacity). The results indicated that RDI could significantly increase the plant height of peanut by 12.73%. The highest yield could be increased by 13.09% and increased Nitrogen Agronomic Efficiency(NAE) 120.68%, but it could decrease water use efficency (WUE) by 20.92% at most. With the increase rate of nitrogen, the peanut plant height, leaf area index (LAI), dry matter, yield and WUE all showed a single-peak curve. The highest yield and WUE increased by 32.03% and 34.03% respectively comparing to N0 treatment. NAE reduced by 247% from 33.23 kg·kg-1 (N1) to 9.57 kg·kg-1 (N3). There was a significant interaction effect between RDI and nitrogen. The finding suggest nitrogen fertilized at 60 kg·hm-2 and moderate deficit at flowing podding stage with the highest peanut yield (6 485.03 kg·hm-2),higher water use efficiency (2.02 kg·m-3) and nitrogen agronomic efficiency (38.82 kg·kg-1) in this region． |
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