Duan, G.; Wu, J.; Que, R.; Zeng, Y.; Zeng, Y.; Pan, X.; Xie, X. Agronomic and Physiological Performances of High-Quality indica Rice under Moderate and High-Nitrogen Conditions in Southern China. Agronomy2023, 13, 1617.
Duan, G.; Wu, J.; Que, R.; Zeng, Y.; Zeng, Y.; Pan, X.; Xie, X. Agronomic and Physiological Performances of High-Quality indica Rice under Moderate and High-Nitrogen Conditions in Southern China. Agronomy 2023, 13, 1617.
Duan, G.; Wu, J.; Que, R.; Zeng, Y.; Zeng, Y.; Pan, X.; Xie, X. Agronomic and Physiological Performances of High-Quality indica Rice under Moderate and High-Nitrogen Conditions in Southern China. Agronomy2023, 13, 1617.
Duan, G.; Wu, J.; Que, R.; Zeng, Y.; Zeng, Y.; Pan, X.; Xie, X. Agronomic and Physiological Performances of High-Quality indica Rice under Moderate and High-Nitrogen Conditions in Southern China. Agronomy 2023, 13, 1617.
Abstract
High-quality rice (Oryza sativa L.) is increasingly widely planted in China with the improvement of people's living standards and the achievement of rice breeding efforts in recent years. However, the agronomic and physiological performances of high-quality indica rice (HQIR) under different nitrogen(N) application conditions in southern China are little known. Two-year consecutive field experiments were conducted with two HQIR and two ordinary-quality indica rice (OQIR) varieties under moderate and high N application rates, with yield and yield components, biomass, N up-take, and their related traits investigated. We found that grain yields of HQIR were slightly de-creased, but grain yields of OQIR were significantly increased by 6.60%-8.88% under high N rate compared with moderate N rate in both years. Thereby, OQIR produced 8.34%-11.87% and 22.00%-22.50% higher grain yield than HQIR under moderate and high N rates, respectively. The different responses of grain yield to N application rates were mainly due to decreased grain set-ting rate in HQIR and increased spikelets m-2 in OQIR under high N rate. Furthermore, high N rate significantly reduced pre-anthesis AE and improved grain-leaf area ratio, while did not in-crease post-anthesis DM compared with moderate N rate in HQIR, which might result in carbon metabolic deterioration and imbalance of source-sink relationship and subsequently lower supply of carbohydrate to panicle. Our results suggest that a moderate N rate (165 kg N ha-1) is beneficial for HQIR varieties to balance the maximum grain yield and high quality in southern China
Keywords
grain yield; biomass; N application rate; high-quality rice
Subject
Biology and Life Sciences, Plant Sciences
Copyright:
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