Evaluation of Different Agronomic Measures on Narrowing the Yield Gap and Improving Nitrogen Use Efficiency of Winter Wheat

doi:10.3969/j.issn.1000-6362.2018.06.002

Abstract

Abstract: The DSSAT model was used to simulate the effect of changing soil nutrient, sowing date, planting density and nitrogen application on narrowing yield gap and improving nitrogen use efficiency of winter wheat, and explore the technical approach of improving the yield and efficiency of winter wheat, which were based on the weather, agro-meteorological observations and soil data of 14 representative observation stations from 1990 to 2015.The results showed that there was great difference in potential yield between different winter wheat stations, and it ranged from 7617 to 14242 kg·ha-1. Diverse agronomic measures can influence the yield differently. Among them, potential ascension of yield for soil nutrient was 53?3124kg·ha-1, and its contribution rate of narrowing yield gap was below 8%, and nitrogen use efficiency was increased by 1.1-20.82kg·kg?1.The potential ascension of yield for early sowing date was -327 to 2292kg·ha-1, and its contribution rate of narrowing yield gap was 7%-17%, and nitrogen use efficiency ranged from -2.18 to 15.28kg·kg-1. The potential ascension of yield for planting density was ?255 to 699kg·ha?1, and the contribution rate of narrowing yield gap was less than 5%, and nitrogen use efficiency ranged from -1.7 to 4.66kg·kg-1.The potential ascension of yield for nitrogen fertilizer was 0-4491kg·ha-1, and the contribution rate of narrowing yield gap was 11%-33%, and nitrogen use efficiency ranged from -32.04 to 0kg·kg-1. This indicated that potential ascension of yield for increasing the nitrogen fertilizer and adjusting sowing date contributed more to narrow the yield gap, followed by soil nutrients and increased planting density. However, increasing nitrogen fertilizer obviously decreased nitrogen use efficiency.

Key words: Winter wheat, DSSAT model, Potential ascension of yield, Nitrogen use efficiency, Yield gap

LI Qin-ying,YAO Feng-mei,ZHANG Jia-hua,ZENG Rui-yun,SHI Si-qi. Evaluation of Different Agronomic Measures on Narrowing the Yield Gap and Improving Nitrogen Use Efficiency of Winter Wheat[J]. Chinese Journal of Agrometeorology, 2018, 39(06): 370-379.

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