Inbred varieties outperformed hybrid rice varieties under dense planting with reducing nitrogen
Open Access
- 29 May 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 10 (1), 8769
- https://doi.org/10.1038/s41598-020-65574-0
Abstract
Field experiments were conducted over two years to evaluate the effects of planting density and nitrogen input rate on grain yield and nitrogen use efficiency (NUE) of inbred and hybrid rice varieties. A significant interaction effect was observed between nitrogen input and planting density on grain yield. Higher number of panicles per square meter and spikelets per panicle largely accounted for the observed advantage in performance of inbred, relative to hybrid varieties. Compared with high nitrogen input rate, nitrogen absorption efficiency, nitrogen recovery efficiency, and partial factor productivity increased by 24.6%, 28.0%, and 33.3% in inbred varieties, and by 32.2%, 29.3%, and 35.0% in hybrids under low nitrogen input, respectively. Inbred varieties showed higher nitrogen absorption efficiency, nitrogen recovery efficiency, and partial factor productivity than hybrids, regardless of nitrogen input level. Nitrogen correlated positively with panicle number, spikelets per panicle, biomass production at flowering, and after flowering in inbred varieties but only with panicle number and biomass production at flowering in hybrids. Inbred varieties are more suitable for high planting density at reduced nitrogen input regarding higher grain yield and NUE. These findings bear important implications for achieving high yield and high efficiency in nutrient uptake and utilization in modern rice-production systems.Funding Information
- National Key Research and Development Program of China
This publication has 23 references indexed in Scilit:
- Relationship Between Grain Yield and Yield Components in Super Hybrid RiceAgricultural Sciences in China, 2011
- Significant Acidification in Major Chinese CroplandsScience, 2010
- Yield potential and radiation use efficiency of “super” hybrid rice grown under subtropical conditionsField Crops Research, 2009
- Reducing environmental risk by improving N management in intensive Chinese agricultural systemsProceedings of the National Academy of Sciences of the United States of America, 2009
- Analysis of yield attributes and crop physiological traits of Liangyoupeijiu, a hybrid rice recently bred in ChinaField Crops Research, 2007
- Lodging-related morphological traits of hybrid rice in a tropical irrigated ecosystemField Crops Research, 2007
- Strategies for overcoming low agronomic nitrogen use efficiency in irrigated rice systems in ChinaField Crops Research, 2006
- Nitrogen Utilization Efficiency: Relationships with Grain Yield, Grain Protein, and Yield‐Related Traits in RiceAgronomy Journal, 2006
- Development of a mechanism for transplanting rice seedlingsMechanism and Machine Theory, 2002
- The efficacy and loss of fertilizer N in lowland ricePublished by Springer Science and Business Media LLC ,1986