Effects of Nitrogen Application Rate on Yield and Quality of Different Genotypes of Foxtail Millet
Jiao Mao1,2, Shu Wang1,2, Yuanmeng Xu1,2, Mengyao Wang1,2, Yuhan Liu1,2, Jiangling Ren1,2, Sichen Liu1,2, Zhijun Qiao1,2, Xiaoning Cao1,2,*
1 Center for Agricultural Genetic Resources Research, Shanxi Agricultural University, Taiyuan, 030031, China
2 College of Agriculture, Shanxi Agricultural University, Jinzhong, 030801, China
* Corresponding Author: Xiaoning Cao. Email: 
(This article belongs to the Special Issue: Integrated Nutrient Management in Cereal Crops)
Phyton-International Journal of Experimental Botany https://doi.org/10.32604/phyton.2024.057945
Received 31 August 2024; Accepted 18 November 2024; Published online 20 December 2024
Abstract
In order to elucidate the response mechanism of yield and quality of different genotypes of foxtail millet to nitrogen application. In this study, plant physiology and metabolomics were used to study the effects of different amounts of nitrogen (0, 75, 150, 225 and 300 kg hm
−2) on agronomic characters, yield and quality of Jingu 21 and Zhangza 10. The results showed that with the increase of nitrogen application, the plant height of different genotypes of foxtail millet increased gradually, and the content of stem diameter, yield, protein, fat, lysine, phenylalanine, isoleucine, arginine, aspartic, glutamic, glycine, and proline content of different genotypes of foxtail millet showed an increasing and then decreasing trend. The highest yield was recorded in Jingu 21 at 150 kg hm
−2, and the highest yield was recorded in Zhangza 10 at 225 kg hm
−2 of nitrogen application. Yield of Jingu 21 was positively correlated with protein and tryptophan content (r = 0.91). The yield of Zhangza 10 was positively correlated with fibre content (r = 0.89). The protein content of different genotypes of foxtail millet were negatively correlated with the peak viscosity (PV), trough viscosity (TV) and breakdown value (BD). The results of this study clarify that the optimal nitrogen application of Jinguu 21 was 150 kg hm
−2, and that of Zhangza 10 was 225 kg hm
−2. The regulation effect of nitrogen on foxtail millet was clarified, which laid the theoretical and technical foundation for foxtail millet cultivation with high yield and high quality.
Keywords
Foxtail millet; nitrogen application rate; yield; quality
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