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Responses of super rice (Oryza sativa L.) to different planting methods for grain yield and nitrogen-use efficiency in the single cropping season.

Chen S, Wang D, Xu C, Ji C, Zhang X, Zhao X, Zhang X, Chauhan BS - PLoS ONE (2014)

Bottom Line: Similar results were also found for N agronomic efficiency.The response of super rice was greater under TP than under WDS.The results suggest that the need to further improve agronomic and other management practices to achieve high yield and N-use efficiency for super rice varieties in WDS.

View Article: PubMed Central - PubMed

Affiliation: China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, Zhejiang, China.

ABSTRACT
To break the yield ceiling of rice production, a super rice project was developed in 1996 to breed rice varieties with super high yield. A two-year experiment was conducted to evaluate yield and nitrogen (N)-use response of super rice to different planting methods in the single cropping season. A total of 17 rice varieties, including 13 super rice and four non-super checks (CK), were grown under three N levels [0 (N0), 150 (N150), and 225 (N225) kg ha-1] and two planting methods [transplanting (TP) and direct-seeding in wet conditions (WDS)]. Grain yield under WDS (7.69 t ha-1) was generally lower than TP (8.58 t ha-1). However, grain yield under different planting methods was affected by N rates as well as variety groups. In both years, there was no difference in grain yield between super and CK varieties at N150, irrespective of planting methods. However, grain yield difference was dramatic in japonica groups at N225, that is, there was an 11.3% and 14.1% average increase in super rice than in CK varieties in WDS and TP, respectively. This suggests that high N input contributes to narrowing the yield gap in super rice varieties, which also indicates that super rice was bred for high fertility conditions. In the japonica group, more N was accumulated in super rice than in CK at N225, but no difference was found between super and CK varieties at N0 and N150. Similar results were also found for N agronomic efficiency. The results suggest that super rice varieties have an advantage for N-use efficiency when high N is applied. The response of super rice was greater under TP than under WDS. The results suggest that the need to further improve agronomic and other management practices to achieve high yield and N-use efficiency for super rice varieties in WDS.

No MeSH data available.


Related in: MedlinePlus

Effect of nitrogen (N) rates and planting methods on N agronomic efficiency (NAE) in 2011 (A) and 2012 (B).WDS, wet direct-seeded rice; TP, transplanting rice; N0, 0 kg N ha−1; N150, 150 kg N ha−1; N225, 225 kg N ha−1. The vertical bars stands for standard error of means. Average means followed by different letters were significantly different at p<0.05 (Tukey’s HSD) in the same variety group.
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pone-0104950-g002: Effect of nitrogen (N) rates and planting methods on N agronomic efficiency (NAE) in 2011 (A) and 2012 (B).WDS, wet direct-seeded rice; TP, transplanting rice; N0, 0 kg N ha−1; N150, 150 kg N ha−1; N225, 225 kg N ha−1. The vertical bars stands for standard error of means. Average means followed by different letters were significantly different at p<0.05 (Tukey’s HSD) in the same variety group.

Mentions: In both years, irrespective of N rate and variety group, no difference was found in NAE between the TP and WDS systems, except for the super indica varieties and japonica CK varieties at N150 in 2011, in which NAE was greater in WDS than in TP (Fig. 2). In the indica group in 2011, NAE was greater (66–270%) in super rice (11.1 kg grain kg−1 N on average) than in CK varieties (5.1 kg grain kg−1 N on average). However, the difference in japonica varieties varied with N rate. No difference was found for NAE at N150, whereas super rice varieties (10.9 kg grain kg−1 N on average) had greater NAE than CK varieties (6.5 kg grain kg−1 N on average) at N225–71% and 61% greater under WDS and TP, respectively. In 2012, irrespective of planting method and variety group, the difference between super and CK varieties was not significant at N150, except for indica varieties under WDS, in which the average NAE in super varieties was 206% greater than that in CK varieties. Regardless of planting method and variety group, super varieties had greater NAE values than CK varieties at N225. A higher NAE in super varieties at N150 and N225 for indica and only at N225 for japonica suggests that indica super varieties might be more sensitive to N than japonica super varieties.


Responses of super rice (Oryza sativa L.) to different planting methods for grain yield and nitrogen-use efficiency in the single cropping season.

Chen S, Wang D, Xu C, Ji C, Zhang X, Zhao X, Zhang X, Chauhan BS - PLoS ONE (2014)

Effect of nitrogen (N) rates and planting methods on N agronomic efficiency (NAE) in 2011 (A) and 2012 (B).WDS, wet direct-seeded rice; TP, transplanting rice; N0, 0 kg N ha−1; N150, 150 kg N ha−1; N225, 225 kg N ha−1. The vertical bars stands for standard error of means. Average means followed by different letters were significantly different at p<0.05 (Tukey’s HSD) in the same variety group.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4128727&req=5

pone-0104950-g002: Effect of nitrogen (N) rates and planting methods on N agronomic efficiency (NAE) in 2011 (A) and 2012 (B).WDS, wet direct-seeded rice; TP, transplanting rice; N0, 0 kg N ha−1; N150, 150 kg N ha−1; N225, 225 kg N ha−1. The vertical bars stands for standard error of means. Average means followed by different letters were significantly different at p<0.05 (Tukey’s HSD) in the same variety group.
Mentions: In both years, irrespective of N rate and variety group, no difference was found in NAE between the TP and WDS systems, except for the super indica varieties and japonica CK varieties at N150 in 2011, in which NAE was greater in WDS than in TP (Fig. 2). In the indica group in 2011, NAE was greater (66–270%) in super rice (11.1 kg grain kg−1 N on average) than in CK varieties (5.1 kg grain kg−1 N on average). However, the difference in japonica varieties varied with N rate. No difference was found for NAE at N150, whereas super rice varieties (10.9 kg grain kg−1 N on average) had greater NAE than CK varieties (6.5 kg grain kg−1 N on average) at N225–71% and 61% greater under WDS and TP, respectively. In 2012, irrespective of planting method and variety group, the difference between super and CK varieties was not significant at N150, except for indica varieties under WDS, in which the average NAE in super varieties was 206% greater than that in CK varieties. Regardless of planting method and variety group, super varieties had greater NAE values than CK varieties at N225. A higher NAE in super varieties at N150 and N225 for indica and only at N225 for japonica suggests that indica super varieties might be more sensitive to N than japonica super varieties.

Bottom Line: Similar results were also found for N agronomic efficiency.The response of super rice was greater under TP than under WDS.The results suggest that the need to further improve agronomic and other management practices to achieve high yield and N-use efficiency for super rice varieties in WDS.

View Article: PubMed Central - PubMed

Affiliation: China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, Zhejiang, China.

ABSTRACT
To break the yield ceiling of rice production, a super rice project was developed in 1996 to breed rice varieties with super high yield. A two-year experiment was conducted to evaluate yield and nitrogen (N)-use response of super rice to different planting methods in the single cropping season. A total of 17 rice varieties, including 13 super rice and four non-super checks (CK), were grown under three N levels [0 (N0), 150 (N150), and 225 (N225) kg ha-1] and two planting methods [transplanting (TP) and direct-seeding in wet conditions (WDS)]. Grain yield under WDS (7.69 t ha-1) was generally lower than TP (8.58 t ha-1). However, grain yield under different planting methods was affected by N rates as well as variety groups. In both years, there was no difference in grain yield between super and CK varieties at N150, irrespective of planting methods. However, grain yield difference was dramatic in japonica groups at N225, that is, there was an 11.3% and 14.1% average increase in super rice than in CK varieties in WDS and TP, respectively. This suggests that high N input contributes to narrowing the yield gap in super rice varieties, which also indicates that super rice was bred for high fertility conditions. In the japonica group, more N was accumulated in super rice than in CK at N225, but no difference was found between super and CK varieties at N0 and N150. Similar results were also found for N agronomic efficiency. The results suggest that super rice varieties have an advantage for N-use efficiency when high N is applied. The response of super rice was greater under TP than under WDS. The results suggest that the need to further improve agronomic and other management practices to achieve high yield and N-use efficiency for super rice varieties in WDS.

No MeSH data available.


Related in: MedlinePlus