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首页> 外文期刊>International Journal of Agronomy >Dynamics of Mean-Variance-Skewness of Cumulative Crop Yield Impact Temporal Yield Variance
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Dynamics of Mean-Variance-Skewness of Cumulative Crop Yield Impact Temporal Yield Variance

机译：累计农作物产量影响时间产量方差的均值-偏度动态

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Farmers' decision to adopt new management or production system depends on production risk. Grain yield data was used to assess production risk in a field experiment composed of two cropping systems (CNV and ORG), each with eight subsystems (two levels each of crop rotation (2-yr and 4-yr), tillage management (conventional, CT and strip, ST), and fertilizer input (fertilized, YF and non-fertilized, NF)). Statistical moments, cumulative yield (CY), temporal yield variance (TYV) and coefficient of variation (CV) were used to assess the risk associated with adopting combinations of new management practices in CNV and ORG. The mean-variance-skewness (M-V-S) statistics derived from yield data separated all 16 subsystems into three clusters. Both cropping systems and clustered subsystems differed as to their ability to maintain a constant yield over years, displayed different yield cumulative probabilities, exhibited significant and different M-V-S relationships, and differed as to the reliability of estimating TYV as a function of CY. Results indicated that differences in management among cropping systems and subsystems contributed differently to the goal of achieving yield potential as estimated by the cumulative density function, and that certain low-input management practices caused a positive shift in yield distribution, and may lower TYV and reduce production risk.
机译：农民决定采用新的管理或生产系统取决于生产风险。在由两个耕作系统（CNV和ORG）组成的田间试验中，谷物产量数据用于评估生产风险，每个耕作系统均具有八个子系统（每个作物轮作两个级别（2-yr和4-yr），耕作管理（常规， CT和带钢，ST）和肥料输入（施肥，YF和非施肥，NF）。统计矩，累积产量（CY），时间产量方差（TYV）和变异系数（CV）用于评估与在CNV和ORG中采用新管理实践相结合的风险。从产量数据得出的均方差偏度（M-V-S）统计数据将所有16个子系统分为三个集群。种植系统和集群子系统在多年内保持恒定产量的能力各不相同，表现出不同的产量累积概率，表现出显着且不同的M-V-S关系，并且根据CY函数估算TYV的可靠性也有所不同。结果表明，种植系统和子系统之间的管理差异对通过累积密度函数估算的实现单产潜力的目标做出了不同的贡献，并且某些低投入管理实践导致单产分布出现正向变化，并可能降低TYV并降低生产风险。

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