Effects of nitrogen application and supplemental irrigation on canopy temperature and photosynthetic characteristics in winter wheat. (18th January 2018)

• Record Type: Journal Article
• Authors: Yang, D. Q.; Dong, W. H.; Luo, Y. L.; Song, W. T.; Cai, T.; Li, Y.; Yin, Y. P.; Wang, Z. L.
• Is Part Of: Journal of agricultural science. Volume 156:Number 1(2018)
• Page Start: 13
• Page End: 23
• Publication Date: 2018-01-18
• Subjects: Agriculture -- Periodicals; 630.5
• DOI: 10.1017/S0021859617000946
• Languages: English
• ISSNs: 0021-8596

Abstract

Abstract: Nitrogen (N) application and irrigation to winter wheat may decrease leaf temperature and enhance photosynthesis: as a result, more photosynthates will be allocated to the grains, resulting in higher grain yields. To investigate this hypothesis, a 2-year field study was conducted with three levels of N fertilizer application (no fertilizer, N0; 240 kg N/ha, N1; 360 kg N/ha, N2) and two different water regimes (rainfed with no irrigation, R; irrigation at the over-wintering, stem elongation and grain filling stages, W). The results show that both N application and supplemental irrigation significantly increased grain yield with increases in both grain number/m 2 and the 1000-grain weight, viz., WN2>WN1>WN0>RN2>RN1>RN0. In addition, application of N under both water regimes significantly increased flag leaf area, above-ground biomass and single stem productivity and decreased leaf temperature, which led to an increase in net photosynthesis rates and ribulose bisphosphate (RuBP) carboxylase activity. Moreover, analysis of the chlorophyll α fluorescence transient showed that N fertilizer application and supplemental irrigation significantly increased electron donor and acceptor performance of the photosystem II reaction centre.