Predicting Rice Grain Yield from Dry Matter Production at Late Tillering1
- J. T. Gilmour2
It was hypothesized that grain yield of rice (Oryza sativa L.) was related to dry matter accumulation at late tillering. Using published data from N rate and timing studies conducted in Arkansas on Crowley silt loam (fine, montmorillonitic, thermic Typic Albaqualf) and in the Philippines, this hypothesis was tested by regressing relative grain yield against relative dry matter production at late tillering. A linear, highly signi6caat relationship which had a slope of 0.52 and intercept of 40% was obtained. In this equation, the dry matter and grain yield were expressed as a percentage of an unfertilized control. The mean relative growth rates after late tiilering were relatively constant irrespective of N management which explained, in part, the influence of dry matter at late tillering on grain yield for these data. Application of this relationship to specific plant-soil-climate situations to predict and/or increase grain yield are potential uses of these findings.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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