RICE SCIENCE

• Research Paper • Previous Articles    

Effects of Nitrogen Fertilization and Genotype on Rice Grain Macronutrients and Micronutrients

  1. College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China; #These authors contributed equally to this work
  • Online:2014-07-28 Published:2014-07-24
  • Contact: LIU Zhenghui DING Yanfeng
  • Supported by:

    This research was supported by grants from Program for New Century Excellent Talents in University, China (Grant No. NCET-10-0472), the Priority Program Development of Jiangsu Higher Education Institutions, and National Natural Science Foundation of China (Grant Nos. 30971733 and 31171485).

Abstract:

High nitrogen (N) input features China’s intensive rice production system. To elucidate N and genotype effects on accumulation of macronutrients and micronutrients in grains of japonica rice, and to discuss its significance in rice production, a three-year field experiment involving six japonica rice varieties and seven N treatments were performed. Macronutrients (Ca, Mg, K, and Na) and micronutrients (Cu, Fe, Mn, and Zn) concentrations in brown and milled rice were measured using an atomic absorption spectrophotometer. For macronutrients, no consistently significant effect of N was detected in both brown and milled rice. For micronutrients, N showed significant effect, especially in lowering Zn accumulation in brown and milled rice. In addition, N tended to increase Fe concentration in milled rice. Genotype showed larger effect on distribution of minerals in milled rice than N. The high-yielding variety, Wuyunjing 7, accumulated larger proportion of Mg, K, and Zn in the milled rice as compared with the other five varieties, and could be of value for rice breeding programs aiming at high nutritional quality. The results demonstrated differences in response to N between macronutrients and micronutrients, and are of significance for coping with ‘hidden hunger’ both in humans and crops through agronomical practices.

Key words: macronutrient, micronutrient, nitrogen fertilization, genotype, rice