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Effects of certain agronomic traits on and relationship between rates of grain-moisture reduction and grain fill during the filling period in maize

Effects of certain agronomic traits on and relationship between rates of grain-moisture reduction and grain fill during the filling period in maize

Field Crops Research 14(4): 339-347

Maize (Zea mays L.) hybrids with fast grain-drying capabilities are needed especially because of the use of costly, non-renewable fossil fuel for drying grain artificially. The objectives of this study were to examine grain-moisture reduction during the grain-filling period and its relationship with rate of fill, and to determine factors affecting these two traits. Ten-ear samples per plot from each of ten commercial and two public hybrids were taken on each of three-sampling dates, beginning 28 days mid-silking and at 10-day intervals thereafter during the grain-filling period. A most significant finding was that rate of grain fill had a direct positive effect on grain-moisture reduction per growing degree day (GDD) during the grain-filling period, suggesting that the hybrids with relatively higher grain moisture reduction would also be fast fillers. GDD to black layer and GDD to mid-silk had direct positive effects on rate of fill. Grain yield and percentage ear moisture were negatively correlated at the three sampling dates (r = -0.84**). Husk weight showed a small positive correlation with grain yield during the filling period, suggesting that husks probably contribute some photosynthate to developing kernels. Husk weight showed an undesirable, positive correlation with percentage ear moisture.

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Accession: 001351934

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DOI: 10.1016/0378-4290(86)90068-7

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