Population Characteristics for Super-high Yielding Hybrid Rice Yongyou 12 (&gt;13.5 t ha
            <sup>-1</sup> )

暁燕, 王; 韦还和,; 张洪程,; Jian, Sun; 张建民,; 陆惠斌,; 杨筠文,; 马荣荣,; 许久夫,; 王珏,; 许跃进,; 孙玉海,

doi:10.3724/sp.j.1006.2014.02149

Cited by 14 publications

(6 citation statements)

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“…Our research results were a little bit similar to previous studies [29]. It is generally accepted that peak seedlings in high-yield rice populations should appear at the jointing stage [30]. The emergence of peak seedlings is critical for rice fields in the Sichuan Basin.…”

Section: Optimal N Management During the Rice Season And N Applicatiosupporting

confidence: 90%

Improving Rice Yields and Nitrogen Use Efficiency by Optimizing Nitrogen Management and Applications to Rapeseed in Rapeseed-Rice Rotation System

Liu

Lyu

et al. 2020

Agronomy

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This investigation aims to provide theoretical and practical evidence for the efficient utilization of nitrogen (N) in paddy-upland rapeseed-rice rotation systems because a lack of previous research on such rotation systems leads to inefficient management practices. The effects of the N application rates and the N fertilizer management strategies for rapeseed and rice were examined, respectively, in relation to the photosynthetic productivity and yields of hybrid rice. The results indicated that the leaf area, Pn, with 40% as basal fertilizer, 40% as tillering fertilize, and 20% as panicle fertilizer and a reduced N rate (30 kg/ha) during the rape season, were higher than other nitrogen management strategies trialed, with conventional N rates in the rape season. The average rice grain yield (9545.15 kg/ha) over the two years with 40% as basal fertilizer, 40% as tillering fertilizer, and 20% as panicle fertilizer was higher than other N treatments with the reduced N rates during the rape season. The reduced N rate during the rapeseed season and 40% as basal fertilizer, 40% as tillering fertilizer, and 20% as panicle fertilizer management during the rice season for the rape-rice rotation system exhibited the highest rice yields. Our findings indicated that the N fertilizer management model was a high-yielding, N-saving, and environmentally friendly measure for rape–rice rotation systems in southern China.

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Section: Optimal N Management During the Rice Season And N Applicatiosupporting

confidence: 90%

Improving Rice Yields and Nitrogen Use Efficiency by Optimizing Nitrogen Management and Applications to Rapeseed in Rapeseed-Rice Rotation System

Liu

Lyu

et al. 2020

Agronomy

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“…One of the representative high-yielding japonica/indica hybrids was late-maturity type of Yongyou japonica/indica hybrids series (LMYS). For example, Yongyou 12 yielded over 13.5 t ha -1 on-farm practice for two executive years in a rice-wheat rotation system in the lower reaches of Yangtze River (Wang et al 2014b).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, for HYYS, sparse plantation might be helpful to stimulate yield potential. For example, the spacing of Yongyou 12, yielded over 13.5 t ha -1 on-farm, was 30 cm×26.7 cm (Wang et al 2014b). In addition, the optimal spacing should be determined on the specific variety and cultivation management in each region.…”

mentioning

confidence: 99%

Suitable growing zone and yield potential for late-maturity type of Yongyou japonica/indica hybrid rice in the lower reaches of Yangtze River, China

Wei

Xing

et al. 2016

Journal of Integrative Agriculture

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Late-maturity type of Yongyou japonica/indica hybrids series (LMYS) have shown great yield potential, and are being widely planted in the lower reaches of Yangtze River. Knowledge about suitable growing zone and evaluation of yield advantage is of practical importance for LMYS in this region. Fifteen LMYS, two high-yielding inbred japonica check varieties (CK-J) and two high-yielding hybrid indica check varieties (CK-I) were grown at Xinghua (119.57°E, 33.05°N) of Lixiahe region, Yangzhou (119.25°E, 32.30°N) of Yanjiang region, Changshu (120.46°E, 31.41°N) of Taihu Lake region, and Ningbo (121.31°E, 29.45°N) of Ningshao Plain in 2013 and 2014. The results showed that maturity dates of the 15 LMYS were later than the secure maturity date at Xinghua and 6, 14, and 15 LMYS were mature before the secure maturity date at Yangzhou, Changshu, and Ningbo, respectively. One variety was identified as high-yielding variety among LMYS (HYYS) at Yangzhou, 8 HYYS in 2013 and 9 HYYS in 2014 at Changshu, 9 HYYS at Ningbo. HYYS here referred to the variety among LMYS that was mature before the secure maturity date and had at least 8% higher grain yield than both CK-J and CK-I at each experimental site. Grain yield of HYYS at each experimental site was about 12.0 t ha-1 or higher, and was significantly higher than check varieties. High yield of HYYS was mainly attributed to larger sink size due to more spikelets per panicle. Plant height of HYYS was about 140 cm, and was significantly higher than check varieties. Significant positive correlations were recorded between duration from heading to maturity and grain yield, and also between whole growth period and grain yield. HYYS had obvious advantage over check varieties in biomass accumulation and leaf area duration from heading to maturity. Comprehensive consideration about safe maturity and yield performance of late-maturity type of Yongyou japonica/indica hybrids series (LMYS) at each experimental site, Taihu Lake region (representative site Changshu) and Ningshao Plain (representative site Ningbo) were thought suitable growing zones for LMYS in the lower reaches of Yangtze River. The main factors underlying high yield of HYYS were larger sink size, higher plant height, longer duration from heading to maturity and whole growth period, and higher biomass accumulation and leaf area duration during grain filling.

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“…So, if the leaves can keep photosynthesis for a longer duration, it can produce more rice grain yield. Therefore, though Yongyou 12 has thick cell wall (330 nm) and a relative low photosynthetic rate (22.3 μmol m -2 s -1 ), it still shows high grain yield in previous studies ( Wang et al 2014 ; Wei et al 2014 ).…”

Section: Discussionmentioning

confidence: 81%

High leaf mass per area Oryza genotypes invest more leaf mass to cell wall and show a low mesophyll conductance

et al. 2020

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Background and Aims The intraspecific variations of leaf structure and anatomy in rice leaves and their impacts on gas diffusion are still unknown. Researches about the tradeoff between structural compositions and intracellular chemical components within rice leaves are still lacking. The objectives of the present study were to investigate the varietal differences in leaf structure and leaf chemical compositions, and the tradeoff between leaf structural tissues and intracellular chemical components in rice leaves. Methods Leaf structure, leaf anatomy, leaf chemical composition concentrations and gas exchange parameters were measured on eight Oryza sativa L. genotypes to investigate the intraspecific variations in leaf structure and leaf anatomy and their impacts on gas exchange parameters, and to study the tradeoff between leaf structural compositions (cell wall compounds) and intracellular chemical components (non-structural carbohydrates, nitrogen, chlorophyll). Key Results Leaf thickness increased with leaf mass per area (LMA), while leaf density did not correlate with LMA. Mesophyll cell surface area exposed to intercellular airspace (IAS) per leaf area, the surface area of chloroplasts exposed to IAS, and cell wall thickness increased with LMA. Cell wall compounds accounted for 71.5% of leaf dry mass, while mass-based nitrogen and chlorophyll concentrations decreased with LMA. Mesophyll conductance was negatively correlated with LMA and cell wall thickness. Conclusions High LMA rice genotypes invest more leaf mass to cell wall and possess a low mesophyll conductance.

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Population Characteristics for Super-high Yielding Hybrid Rice Yongyou 12 (>13.5 t ha ^-1 )

Cited by 14 publications

References 1 publication

Improving Rice Yields and Nitrogen Use Efficiency by Optimizing Nitrogen Management and Applications to Rapeseed in Rapeseed-Rice Rotation System

Improving Rice Yields and Nitrogen Use Efficiency by Optimizing Nitrogen Management and Applications to Rapeseed in Rapeseed-Rice Rotation System

Suitable growing zone and yield potential for late-maturity type of Yongyou japonica/indica hybrid rice in the lower reaches of Yangtze River, China

High leaf mass per area Oryza genotypes invest more leaf mass to cell wall and show a low mesophyll conductance

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Population Characteristics for Super-high Yielding Hybrid Rice Yongyou 12 (>13.5 t ha -1 )

Cited by 14 publications

References 1 publication

Improving Rice Yields and Nitrogen Use Efficiency by Optimizing Nitrogen Management and Applications to Rapeseed in Rapeseed-Rice Rotation System

Improving Rice Yields and Nitrogen Use Efficiency by Optimizing Nitrogen Management and Applications to Rapeseed in Rapeseed-Rice Rotation System

Suitable growing zone and yield potential for late-maturity type of Yongyou japonica/indica hybrid rice in the lower reaches of Yangtze River, China

High leaf mass per area Oryza genotypes invest more leaf mass to cell wall and show a low mesophyll conductance

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Population Characteristics for Super-high Yielding Hybrid Rice Yongyou 12 (>13.5 t ha ^-1 )