Redefining soybean critical period for yield determination

IF 5.6 1区 农林科学 Q1 AGRONOMY
Anibal Cerrudo , Seth L. Naeve
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引用次数: 0

Abstract

Context

Critical period for yield determination is essential for crop management. Research on soybean has focused on grain number sensitivity to stress, while the impact of weight per grain remains underexplored.

Objective

Redefine soybean yield determination by accounting for grain number and weight per grain.

Methods

Three field experiments that imposed shading treatments at different growth stages. Crop development, yield, and yield components were monitored.

Results

Critical period for yield determination extended from R4 to R7 stages, with peak sensitivity around R5.5. Grain number sensitivity lasted from R3 to R6, while weight per grain sensitivity occurred from R5 to R7. Compensation between yield components up to R4 occurred. Source-sink ratio accounted for most of the variation in weight per grain, which showed no significant deviation from this relationship across all treatments.

Discussion

Critical period for soybean yield determination was identified, emphasizing the need to consider both grain number and weight per grain. Early compensation between yield components indicated a source limitation state in non-stressed crops. Additionally, no evidence of a sink limitation on yield within the range of stresses imposed was found.

Conclusions

The critical period for soybean yield encompassed R4 to R7, with differential sensitivity to stress between grain number and weight per grain. Sink limitation did not directly cause yield reduction under the conditions studied. Yield optimization should focus on addressing source limitation during those growth stages.

Implications

Provided valuable insights on soybean management, modeling and breeding. Orientate the focus on enhancing source capacity during critical stages.
重新定义大豆产量确定关键期
背景产量确定的关键时期对作物管理至关重要。对大豆的研究主要集中在粒数对胁迫的敏感性,而粒重的影响仍未得到充分探讨。方法在不同生长阶段进行了三次田间试验,对遮光处理进行了监测。结果产量测定的关键时期从 R4 阶段延伸到 R7 阶段,R5.5 左右达到峰值。粒数敏感期从 R3 到 R6,而粒重敏感期从 R5 到 R7。产量成分之间的补偿一直持续到 R4。讨论确定了大豆产量确定的关键时期,强调了同时考虑粒数和粒重的必要性。产量成分之间的早期补偿表明,非受压作物处于源限制状态。结论 大豆产量的临界期包括 R4 到 R7,谷粒数和每粒重量对胁迫的敏感性不同。在所研究的条件下,水槽限制并不直接导致减产。意义为大豆的管理、建模和育种提供了宝贵的见解。将重点放在提高关键阶段的源能力上。
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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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