Is research on marginal lands catching up? The case of unfavourable wheat growing environments
Is research on marginal lands catching up? The case of unfavourable wheat growing environments
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DOI：
10.1016/s0169-5150(03)00062-8
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发表时间：
2003-12-01
影响因子：
4.1
通讯作者：
Rajaram, S
中科院分区：
文献类型：
--
作者：
Lantican, MA;Pingali, PL;Rajaram, S
人们普遍认为，绿色革命在不利或边缘环境中影响很小。许多研究人员一直对边缘环境中技术变革进展缓慢以及分配给这些领域的研究资源水平感到关切。本文提供的经验证据表明，在边际环境中，特别是在后绿色革命期间，小麦产量潜力显著增长。国际产量试验数据涵盖了从1964年到1999年的所有主要小麦种植环境，用于估计小麦产量潜力的增长和产量变异的变化。根据估计的小麦产量增长率建立的全球小麦品种采用率和产量增长数据库被用来确定小麦育种研究带来的增产。结果表明，在边缘地区转移小麦产量前沿方面取得了更大进展，特别是在干旱和高温环境中。此外，边缘环境中的产量变异性显著下降，而有利环境中的产量变异性略有增加。虽然最初的收益来自有利环境的品种杂交，但有针对性的育种努力对最近边缘环境的生产率增长做出了重大贡献。来自边缘环境的增产约占1997年小麦总产量增产的25%。这些发现显示了小麦研究的更大进展，以及在不利环境中提高小麦产量的巨大潜力。(C)2003爱思唯尔B.V.保留所有权利。
It is widely believed that the Green Revolution had very little effect in unfavourable or marginal environments. Many researchers have been concerned about the slow progress of technical change in marginal environments and the level of research resources allocated to these areas. This paper provides empirical evidence that there has been significant growth in wheat yield potential in marginal environments, especially during the post-Green Revolution. International yield trial data, covering all major wheat growing environments from 1964 to 1999, were used in estimating the growth in wheat yield potential and changes in yield variability. The global database on wheat varietal adoption and yield gains based on estimated wheat yield growth rates were used to determine production increases due to wheat breeding research. Results show greater progress in shifting the wheat yield frontier in marginal areas, particularly in drought and high temperature environments. Furthermore, yield variability in marginal environments has notably declined, while it has increased slightly in favourable environments. While initial gains came from crossover of varieties from favourable environments, targeted breeding efforts have contributed significantly to more recent productivity growth in marginal environments. Increased production from marginal environments accounted for around 25% of the total wheat production increase in 1997. These findings show greater progress in wheat research and the huge potential of improving wheat productivity in unfavourable environments. (C) 2003 Elsevier B.V. All rights reserved.