Relationships between canopy structure and yield in rice plants 1. panicle number type and panicle weight type cultivars in square and row plantings at 3 planting density levels in 3 cropping seasons

Tsuchiya, H.; Kinoshita, O.

Japanese Journal of Crop Science 52(4): 435-446


Accession: 006302052

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Two lowland rice cultivars. Yamahoushi (panicle-weight type) and Kinki No. 33 (panicle-number type), were grown in 3 cropping seasons (early, normal and late plantings) at 3 levels of planting density (40, 20 and 10 hill/m2) in 1968. Yamahoushi was square-planted and Kinki No. 33 was planted both in square and in row. The relationships between yield and total biomass and those between yield and vertical distribution of leaf blade were examined by principal component analysis. The yield of a sparse stand is higher when the leaf weight percentage in the lower strata is larger at the tillering stage, while the yield of a dense stand is higher when the leaf weight percentages in the upper strata is larger after the young panicle formation stage. The analysis of leaf stratified structure used may be a useful method to quantify and evaluate the canopy architecture of rice crops.