| Effects of irrigation amount and nitrogen fertilizer\|reduction pattern on yield and utilization of water and nitrogen of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2020.01.20 |
| Key Words: winter wheat irrigation amount slow/controlled release nitrogen fertilizer water and nitrogen utilization [JP] soil nitrate nitrogen residue yield Guanzhong Plain |
| Author Name | Affiliation | | ZHANG Jie | College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University,Yangling, Shaanxi 712100, China | | HU Tiantian | College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University,Yangling, Shaanxi 712100, China | | HE Qiong | College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University,Yangling, Shaanxi 712100, China | | LI Hongxiang | College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University,Yangling, Shaanxi 712100, China |
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| Abstract: |
| n order to explore the reasonable nitrogen (N) fertilizer\|reduction and suitable irrigation amount on winter wheat in Guanzhong Plain, a winter wheat field split plot experiment was carried out using irrigation amount as the main treatment and nitrogen fertilizer\|reduction pattern as the sub\|treatment. The irrigation amount was set to 90 mm and 150 mm. According to the local customary application of N (urea CO, 210 kg·hm-2 N application rate), the N application rate of theN fertilizer\|reduction pattern was set at 150 kg·hm-2 N application rate,and there were three types of N application:ureaplusnitrification inhibitor (DMPP),controlled release N fertilizer and urea mixed application (PCU) and controlled loss of fertilizer (SF),and a control (N0) without N. The wheat yield, water and N use efficiency, and soil nitrate Nresidual status were analyzed.The results showed that the two\|factors of irrigation amount and N fertilizer\|reduction patternand their interaction had significant effects on available ear, 1 000-grain weight, grain yield, soil NO-3-N residual amount, and water and nitrogen use efficiency.The effect of irrigation amount on winter wheat yield varied with N fertilizer\|reduction pattern. Compared with 90 mm, PCU150 and DMPP treatments reduced the yield when the irrigation volume was 150mm, and increased the yield of SF150 and N0 treatment. When the water was 90 mm, nitrogen fertilizer\|reduction patterns PCU150 and DMPP150 decreasedN amount by 28.6%compared with the conventional N fertilizer pattern CO210, andthe grain yield and available ear increased significantly, which increased yield by 17.4 and 11.6%, respectively; the water use efficiency increased by 17.5% and 13.5%; N use efficiency increased by 64.3% and 58.4%; 0~200 cm soil NO-3-N residual amount decreased by 57.8% and 45.6%, respectively.Winter wheat on Guanzhong Plain with 90mm irrigationduring the whole growth period and N fertilizer\|reduction patterns of urea plus nitrification inhibitors and 60% of resin coated urea as basefertilizer and 40% of urea at jointing stage maintained optimum yield and water and fertilizer use efficiency. |
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