Analysis of the variations of rice [Oryza sativa] yield in paddy-upland rotational fields
2007
Ikenaga, S.(Kyoto Univ. (Japan)) | Matsumoto, N. | Inamura, T.
The source of the variation of yield and yield components of paddy rice was analyzed in the paddy-upland rotational fields (rice-wheat-soybean) and in the single-cropped paddy fields from 1998 to 2003. Yield variations were affected by spikelet number. Panicle number and spikelet number per panicle contributed to yield when spikelet number was less than 32800 msup(-2), and percentage of ripened grains and 1 000-grain weight when spikelet number was 32800 msup(-2) or more. Spikelet number that was controlled by panicle number was influenced by soil mineralization that is different between/within paddy-upland rotational fields and single cropping field. We conclude that proper management of fertilization is essential to obtain adequate panicle number for the optimum yield of paddy-upland rotational fields and in single cropping fields separately.
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