EFFECTS OF SAMPLING DATES ON ESTIMATES OF STALK QUALITY IN MAIZE

Abstract
Rind puncture values were obtained at 1 wk preflowering and then at 2-wk intervals in six single crosses of known stalk quality. On the same dates, stalk samples were obtained for determining crushing strength mechanically. Rind puncture values were lowest for the first sampling date, highest for the second sampling date, and lower again for the third and fourth dates. They were highly correlated (0.79, 0.68, 0.87, and 0.89, respectively) with crushing strength at each of the four sampling dates. We concluded that the rind puncture method would be useful in identifying S0 plants or S1 families with superior stalk quality prior to flowering. The method would enhance a cyclic breeding program by permitting the completion of one cycle per generation.

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