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Water and Nitrogen Management on Micronutrient Concentrations in Winter Wheat
Author(s) -
Wang Shaoxia,
Tian Xiaohong,
Li Meng,
Ni Yijun,
Li Jin,
Li Hongyun,
Wang Shujuan,
Chen Yanlong,
Guo Chunhui,
Zhao Aiqing
Publication year - 2014
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj13.0354
Subject(s) - micronutrient , agronomy , bioavailability , wheat grain , fertilizer , irrigation , nitrogen , zoology , human fertilization , soil water , biofortification , chemistry , grain quality , nutrient , biology , ecology , bioinformatics , organic chemistry
Water status and N fertility are the critical factors in micronutrient accumulation in grain of wheat ( Triticum aestivum L.). This field experiment was conducted to examine whether the changes in N fertility and water management can influence micronutrient concentration and bioavailability in wheat grown in soils with existing low micronutrient concentrations within drought‐prone regions. The results indicate that fertilizer N (120 or 240 kg N ha −1 ) application significantly improved grain Zn, Fe, Cu, and protein concentration with a mean increase of 24.7, 39.2, 18.6, 23.9% in 2009/2010 and 8.9, 21.1, 10.5, 29.6% in 2010/2011, respectively, when compared with the unfertilized treatment. However, grain Mn concentration in both cropping seasons were significantly decreased (on average by 8.4%) by N fertilization. Compared to the no irrigation treatment (NI), the water‐saving treatment (RF) significantly increased grain Zn by an average of 13.2%, grain Fe by 22.2%, grain Mn by 4.4%, and grain protein by 8.3%. Grain phytic acid (PA) concentration and PA/micronutrient ratios were on average 28.0 and 32.2% lower in the N fertilized treatment than in the unfertilized treatment. Decreasing the N application rate from 240 to 120 kg N ha −1 did not affect much of the grain nutritional quality, with the exception of a significant decrease in grain Zn concentration, and a significant increase in grain PA concentrations and the PA/Zn molar ratio. These data demonstrate the importance of monitoring grain Zn concentrations, and perhaps the inclusion of supplemental Zn when adopting alternative N fertilizer management regimes in northern China.