Timing of N Application Affects Net Primary Production of Soybean with Different Planting Densities

doi:10.1016/S2095-3119(13)60535-3

Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (12): 2778-2787.DOI: 10.1016/S2095-3119(13)60535-3

Timing of N Application Affects Net Primary Production of Soybean with Different Planting Densities

ZHANG Ming-cong, SUN Wen-xiang, LIU Yuan-ying, LUO Sheng-guo, ZHAO Jing, WU Qiong, WU Zhen-yu , JIANG Yi

Resource and Environment College, Northeast Agricultural University, Harbin 150030, P.R.China

收稿日期:2013-04-23 出版日期:2014-12-01 发布日期:2014-12-10
通讯作者: LIU Yuan-ying, Mobile: 13895705271, Tel: +86-451-55190439,E-mail: yuanyingl@163.com
作者简介:ZHANG Ming-cong, Mobile: 15845001970, E-mail: zhangmingcong@163.com
基金资助:
This study was conducted in the Key Laboratory of Soybean Biology, Ministry of Education and financially supported by the Special Fund for Agro-Scientific Research in the Public Interest, China (201103003), and the Key Technologies R&D Program of China during the 12th Five-Year Plan period (2012BAD20B04).

Timing of N Application Affects Net Primary Production of Soybean with Different Planting Densities

ZHANG Ming-cong, SUN Wen-xiang, LIU Yuan-ying, LUO Sheng-guo, ZHAO Jing, WU Qiong, WU Zhen-yu , JIANG Yi

Resource and Environment College, Northeast Agricultural University, Harbin 150030, P.R.China

Received:2013-04-23 Online:2014-12-01 Published:2014-12-10
Contact: LIU Yuan-ying, Mobile: 13895705271, Tel: +86-451-55190439,E-mail: yuanyingl@163.com
About author:ZHANG Ming-cong, Mobile: 15845001970, E-mail: zhangmingcong@163.com
Supported by:
This study was conducted in the Key Laboratory of Soybean Biology, Ministry of Education and financially supported by the Special Fund for Agro-Scientific Research in the Public Interest, China (201103003), and the Key Technologies R&D Program of China during the 12th Five-Year Plan period (2012BAD20B04).

摘要/Abstract

摘要： Understanding the relationship between the timing of N fertilizer applications and crop primary production is crucial for achieving high yield and N use efficiency in agriculture. This study investigated the effects of starting-N plus topdressing N applications (as compared to the common practice of all basal application) on soybean photosynthetic capacity under different planting densities. A field experiment was conducted in two growing seasons (2011 and 2012), and the soybean (Glycine max L. Merrill) cultivar was Dongnong 52, three planting densities (20, 25 and 30 plants m-2), and four N fertilizer application patterns (all N fertilizer of 6 g N m-2 as basal fertilizer, all N fertilizer as topdressing at beginning pod stage (R3), 1.8 g N m-2 as basal fertilizer and 4.2 g N m-2 as topdressing at stage R3 and full pod stage (R4), respectively). The results indicated that under the same planting density, compared to applying all N as basal fertilizer, the application of starter-N plus topdressing N substantially reduced the rate of pod abscission, and enhanced leaf area index (LAI) significantly at beginning seed stage (R5) (P<0.05), net assimilation rate (NAR) during stages R4-full seed stage (R6) (P<0.05), contribution rate of post-seed filling assimilate to seed (CPA) (P<0.05), and yield (P<0.05). Applying topdressing N at stage R4 resulted in higher net primary production and yield than applying topdressing N at stage R3. When applying starter-N plus topdressing N at planting density of 25 plants m-2, LAI after stage R5 and NAR after stage R4 were increased by 5.92-16.3% (P<0.05) and 13.7-26.6% (P<0.05) with the planting density of 20 plants m-2, respectively, and yield was 8.46-14.0% (P<0.05) higher than that under 20 plants m-2. When planting density increased to 30 plants m-2, only LAI during stages R4-R5 and NAR during stages R4-R5 increased by applying starter-N plus topdressing N, while the other indexes declined. Overall, results of this study demonstrated that applying starter-N plus topdressing N could significantly enhance soybean photosynthetic capacity after stage R5 at planting density of 25 plants m-2.

关键词: soybean , starter-N plus topdressing N , density , leaf area index (LAI) , net assimilation rate (NAR)

Abstract: Understanding the relationship between the timing of N fertilizer applications and crop primary production is crucial for achieving high yield and N use efficiency in agriculture. This study investigated the effects of starting-N plus topdressing N applications (as compared to the common practice of all basal application) on soybean photosynthetic capacity under different planting densities. A field experiment was conducted in two growing seasons (2011 and 2012), and the soybean (Glycine max L. Merrill) cultivar was Dongnong 52, three planting densities (20, 25 and 30 plants m-2), and four N fertilizer application patterns (all N fertilizer of 6 g N m-2 as basal fertilizer, all N fertilizer as topdressing at beginning pod stage (R3), 1.8 g N m-2 as basal fertilizer and 4.2 g N m-2 as topdressing at stage R3 and full pod stage (R4), respectively). The results indicated that under the same planting density, compared to applying all N as basal fertilizer, the application of starter-N plus topdressing N substantially reduced the rate of pod abscission, and enhanced leaf area index (LAI) significantly at beginning seed stage (R5) (P<0.05), net assimilation rate (NAR) during stages R4-full seed stage (R6) (P<0.05), contribution rate of post-seed filling assimilate to seed (CPA) (P<0.05), and yield (P<0.05). Applying topdressing N at stage R4 resulted in higher net primary production and yield than applying topdressing N at stage R3. When applying starter-N plus topdressing N at planting density of 25 plants m-2, LAI after stage R5 and NAR after stage R4 were increased by 5.92-16.3% (P<0.05) and 13.7-26.6% (P<0.05) with the planting density of 20 plants m-2, respectively, and yield was 8.46-14.0% (P<0.05) higher than that under 20 plants m-2. When planting density increased to 30 plants m-2, only LAI during stages R4-R5 and NAR during stages R4-R5 increased by applying starter-N plus topdressing N, while the other indexes declined. Overall, results of this study demonstrated that applying starter-N plus topdressing N could significantly enhance soybean photosynthetic capacity after stage R5 at planting density of 25 plants m-2.

Key words: soybean , starter-N plus topdressing N , density , leaf area index (LAI) , net assimilation rate (NAR)

ZHANG Ming-cong, SUN Wen-xiang, LIU Yuan-ying, LUO Sheng-guo, ZHAO Jing, WU Qiong, WU Zhen-yu , JIANG Yi. Timing of N Application Affects Net Primary Production of Soybean with Different Planting Densities[J]. Journal of Integrative Agriculture, 2014, 13(12): 2778-2787.

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Timing of N Application Affects Net Primary Production of Soybean with Different Planting Densities

Timing of N Application Affects Net Primary Production of Soybean with Different Planting Densities

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