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首页> 外文期刊>Plant Production Science >Effect of Plot Size on Accuracy of Yield Estimation of Rainfed Lowland Rice Genotypes with Different Plant Heights and Grown under Different Soil Fertility Conditions
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Effect of Plot Size on Accuracy of Yield Estimation of Rainfed Lowland Rice Genotypes with Different Plant Heights and Grown under Different Soil Fertility Conditions

机译：地块大小对不同土壤肥力条件下不同植株高度和生长方式的旱作水稻基因型产量估算精度的影响

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Breeding programs for rainfed lowland rice normally use large plot sizes for accurate estimation of yield. Resource requirements are reduced and more genotypes can be tested if a small plot size can be used. A total of 4 experiments was conducted at high and low soil fertility locations in Thailand to determine the influence of plot size and arrangement of tall and short genotypes in small plots on the estimation of yield of genotypes differing in height. Ten to sixteen genotypes were grown in different orders of tall and short genotypes within 2-row plots and also in random arrangements in 4-row, 6-row and 16-row plots. Results showed that taller genotypes tended to suppress the performance of the neighboring shorter genotypes. Consequently the yield results from 2-row plots, in which genotypes were randomly allocated, were unreliable at the high soil fertility location with more vigorous growth, although they were sufficient at the low soil fertility location. Thus plot sizes of 4 and 6-rows appear necessary for accurate estimation of yield across environments. However, when all short genotypes were grouped together and formed a block, and all tall genotypes grouped to form another block, yield results from 2-row plots showed a rather small effect of the competition between the neighbouring genotypes. The yield estimation was improved further by adjusting yield according to the height of each genotype by using covariance analysis. With these modifications, 2-row plots were found to be sufficient for accurate estimation of yield.
机译：雨养低地水稻的育种计划通常使用较大的地块大小，以准确估算产量。如果可以使用较小的地块，可以减少资源需求，并可以测试更多的基因型。在泰国的高低土壤肥力位置总共进行了4个实验，以确定小块地的大小以及高矮基因型的布局对高低基因型产量估算的影响。在2行样图中，以高和短基因型的不同顺序生长了10至16个基因型，在4行，6行和16行样图中也随机排列。结果表明，较高的基因型倾向于抑制邻近的较短基因型的表现。因此，在土壤肥力高，生长力强的2行地块（随机分配基因型）上获得的产量不可靠，尽管在土壤肥力低的地方就足够了。因此，为了准确估计整个环境的产量，需要4和6行的样区大小。但是，当所有短基因型分组在一起并形成一个区块，而所有高个基因型分组以形成另一个区块时，两行图的产量结果显示相邻基因型之间竞争的影响很小。通过使用协方差分析根据每种基因型的高度调整产量，进一步提高了产量估算。通过这些修改，发现2行图足以准确估算产量。

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