Primary components of corn yield in the tropics [Philippines]
1985
Empig, L.T. | Serrano, E.M. | Zuno, J.C. (San Miguel Corp., Calauan, Laguna (Philippines). Hybrid Seed Research Center)
In order to develop an index for estimating the yield of corn hybrids in the tropics, a stepwise multiple regression analysis (SMRA) using stand at harvest (SAH), prolificacy (P), and seed weight per ear (SW/E) as independent variables was fitted on yield data from six replicated yield tests and four commercial trials. The SMRA results in the replicated yield trials had less variable SAH among entries due to overseeding and subsequent thinning revealed that SW/E was consistently the most important yield component followed by P and SAH. The three yield components were all good predictors of yield as shown by the significant coefficient of determination (R2) ranging from 0.725 to 0.997 in the six trials. On large commercial tests, which are not corrected for stand, SW/E and P are more or less equally important in estimating yield if SAH is high and does not vary by more than 20% among entries. SAH became the most important yield component when actual stand is low and when they vary considerably among entries
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