Influence of long-term nitrogen fertilization on micronutrient density in grain of winter wheat (Triticum aestivum L.) |
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Authors: | Rongli Shi Yueqiang Zhang Xinping Chen Qinping Sun Fusuo Zhang Volker Römheld Chunqin Zou |
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Institution: | 1. Key Laboratory of Plant–Soil Interactions, MOE, China Agricultural University, Beijing 100193, PR China;2. Key Laboratory of Plant Nutrition, MOA, China Agricultural University, Beijing 100193, PR China;3. Department of Plant Nutrition, China Agricultural University, Beijing 100193, PR China;4. Institute of Plant Nutrition (330), University Hohenheim, 70593 Stuttgart, Germany |
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Abstract: | A long-term (1999–2007) field experiment was conducted to investigate the effects of three nitrogen (N) fertilization rates (0, 130, and 300 kg N/ha) on micronutrient density in wheat grain and its milling fractions. At maturity, grains were harvested and fractionated into flour, shorts, and bran for micronutrient and N analysis. N fertilization increased iron (Fe), zinc (Zn), and copper (Cu) density in wheat grain compared to the control. Increase of N application rate from 130 to 300 kg N/ha, however, did not further increase the three micronutrient densities in grain. Micronutrient concentrations were usually highest in the bran and lowest in the flour. High N application increased Zn and Cu densities in all three milling fractions and increased Fe concentration in shorts and bran but not in flour. N application did not affect the manganese (Mn) concentration in grain. N fertilization changed the proportions of Fe and Cu in flour and bran but did not affect the distribution of Zn. Because N fertilization increased micronutrient accumulation in wheat grain, proper management of N fertilization has the potential to enhance the nutritional quality of this important food. |
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Keywords: | Micronutrient Nitrogen fertilization Wheat grain Milling fraction |
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