Reasonable Nitrogen Regime in the Main Crop Increased Grain Yields in Both Main and Ratoon Rice

Qiang Zhang, Xiangchen Liu, Guilong Yu, Bin Duan, Hao Wang, Haiying Zhao, Daqing Feng, Mengxuan Gu and Lijun Liu
Additional contact information
Qiang Zhang: Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
Xiangchen Liu: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Guilong Yu: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Bin Duan: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Hao Wang: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Haiying Zhao: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Daqing Feng: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Mengxuan Gu: Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
Lijun Liu: Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China

Agriculture, 2022, vol. 12, issue 4, 1-20

Abstract: Planting ratoon rice can realize one sowing and two harvests, which is of great significance for improving grain yield. However, the effects of nitrogen (N) regime in the main crop on the grain yield of ratoon rice and the associated physiological mechanisms are not clearly understood. The indica hybrid rice Liangyou 6326 was used, and three N fertilizer levels (100 kg ha −1 (low N, LN), 250 kg ha −1 (medium N, MN), and 400 kg ha −1 (high N, HN)) and four different ratios of basal tillering fertilizer to panicle fertilizer (7:3, 6:4, 5:5, and 4:6) applied to the main crop were designed to investigate their effects on the grain yields of the main and ratoon crops. The results showed that excessive N application rate and panicle N application rate in the main crop was not conducive to the improvement of yield and agronomic nitrogen use efficiency (ANUE) in both seasons. The increased yield in the ratoon crop was attributed to the increase in the regeneration rate. Appropriate increasing of the panicle N application rate was beneficial for increasing the ROA and NSC concentration in the main crop, resulting in an increase in the number, length, and fresh weight of regenerated buds, which caused an improvement in the regeneration rate. However, when excessive panicle N was applied in the main crop, the excessive germination of regenerated buds decreased the length and fresh weight of the regenerated bud and resulted in a decrease in the regeneration rate. These results suggest that in the production of ratoon rice, reasonable N regime in the main crop could increase the yield and ANUE in both seasons.

Keywords: nitrogen rate; nitrogen ratio; yield; regenerative ability (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2077-0472/12/4/527/pdf (application/pdf)
https://www.mdpi.com/2077-0472/12/4/527/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:12:y:2022:i:4:p:527-:d:789397

Access Statistics for this article

Agriculture is currently edited by Ms. Leda Xuan

More articles in Agriculture from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().