| Recommendation model of nitrogen fertilizer based on SPAD of leaves for drip-irrigated spring wheat |
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| DOI：10.7606/j.issn.1000-7601.2017.01.16 |
| Key Words: spring wheat drip irrigation SPAD value N fertilizer recommendation |
| Author Name | Affiliation | | SHI Li-chao | Department of Resources and Environmental Sciences, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China | | ZHAI Yong | Department of Resources and Environmental Sciences, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China | | WANG Xue-yan | Department of Resources and Environmental Sciences, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China | | HOU Zhen-an | Department of Resources and Environmental Sciences, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China | | YE Jun | Department of Resources and Environmental Sciences, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China |
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| Abstract: |
| To explore a nitrogen fertilizer recommendation using SPAD-502 for drip-irrigated spring wheat, an experiment had been carried out between 2014 and 2015. Field test data in 2014 was applied to establish a nitrogen fertilizer recommendation model based on SPAD of leaves for drip-irrigated spring wheat, which was compared with the field test in 2015. The results showed that the SPAD of wheat leaves presented a liner increasing trend with the increase of N fertilizer rate at jointing, booting, heating and filling stages. The corresponding thresholds of SPAD were 42.4, 39.4, 41.8, and 54.1, respectively, when the total application rate of nitrogen fertilizer was 261 kg·hm-2 during the whole growth period of spring wheat. As a result, a nitrogen fertilizer recommendation model based on the SPAD of leaves could be established in this experiment. Field experiment indicated that the nitrogen fertilizer recommendation model could make the fertilizer application rate down by 7.86% and the utilization ratio up by 9.64% when wheat yield is secured. |
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