Effects of panicle fertilizer application on source-sink characteristics and nitrogen fertilizer use efficacy of Ganxin688
[Objective]The paper was to explore the effect of postponing application of N fertilizer on source-sink characteristics of super hybrid rice Ganxin688. [Method] With super hybrid rice Ganxin688 as test material, the source organ traits (leaf area index, leaf weight, chlorophyll content, photosynthet...
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Published in | Hunan agricultural science & technology newsletter : HASTN Vol. 12; no. 10 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
01.10.2011
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Abstract | [Objective]The paper was to explore the effect of postponing application of N fertilizer on source-sink characteristics of super hybrid rice Ganxin688. [Method] With super hybrid rice Ganxin688 as test material, the source organ traits (leaf area index, leaf weight, chlorophyll content, photosynthetic rate of flag leaf, stem and sheath dry matter accumulation and output) and yield were measured, the effects of nitrogen application on source-sink relationship, yield and N fertilizer use efficiency were also studied. [Result] Appropriate postponing of N fertilizer was benefit for optimizing population quality, harmonizing source-sink relation, enhancing leaf function, prolonging leaf function period and increasing N fertilizer use efficiency. After heading, the leaves area index (LAI) and chlorophyll content increased with the increasing application amount of panicle fertilizer, and their reduction rate slowed down with the increased application amount of panicle fertilizer. Appropriate increased application of panicle fertilizer could prolong the function period of leaves in lower position, increase storage amount of stem and sheath matter, total sink capacity and sink capacity per unit leaf area during heading stage, improve panicle rate and seed setting rate, reduce the demand of grain sink on stem and sheath matter, and increase lodging resistance of plant, which could also increase dry matter productivity and rice productivity of N fertilizer, and increase absorption and application ratio and total accumulation amount of N fertilizer. For Ganxin 688, when N application amount was 175 -205 kg/hm2, the proportion of panicle fertilizer in total nitrogen application should be better as 40%-45%. [Conclusion] The study provided basis for making reasonable and efficient N application strategy to establish a coordinated huge sink and strong source relationship for super rice. |
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AbstractList | [Objective]The paper was to explore the effect of postponing application of N fertilizer on source-sink characteristics of super hybrid rice Ganxin688. [Method] With super hybrid rice Ganxin688 as test material, the source organ traits (leaf area index, leaf weight, chlorophyll content, photosynthetic rate of flag leaf, stem and sheath dry matter accumulation and output) and yield were measured, the effects of nitrogen application on source-sink relationship, yield and N fertilizer use efficiency were also studied. [Result] Appropriate postponing of N fertilizer was benefit for optimizing population quality, harmonizing source-sink relation, enhancing leaf function, prolonging leaf function period and increasing N fertilizer use efficiency. After heading, the leaves area index (LAI) and chlorophyll content increased with the increasing application amount of panicle fertilizer, and their reduction rate slowed down with the increased application amount of panicle fertilizer. Appropriate increased application of panicle fertilizer could prolong the function period of leaves in lower position, increase storage amount of stem and sheath matter, total sink capacity and sink capacity per unit leaf area during heading stage, improve panicle rate and seed setting rate, reduce the demand of grain sink on stem and sheath matter, and increase lodging resistance of plant, which could also increase dry matter productivity and rice productivity of N fertilizer, and increase absorption and application ratio and total accumulation amount of N fertilizer. For Ganxin 688, when N application amount was 175 -205 kg/hm2, the proportion of panicle fertilizer in total nitrogen application should be better as 40%-45%. [Conclusion] The study provided basis for making reasonable and efficient N application strategy to establish a coordinated huge sink and strong source relationship for super rice. |
Author | Huang Caili, Jiangxi Agricultural University, Nanchang (China), College of Agronomy Li Muying, Jiangxi Agricultural University, Nanchang (China), College of Agronomy Shi Qinghua, Jiangxi Agricultural University, Nanchang (China), College of Agronomy |
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DocumentTitle_FL | 穗肥运筹对淦鑫688源库特征和N肥效益的影响 |
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Title | Effects of panicle fertilizer application on source-sink characteristics and nitrogen fertilizer use efficacy of Ganxin688 |
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