Time of Planting in a Comparison of Plow-Plant and Conventional Seedbed Preparation for Corn1
- G. R. Free,
- C. S. Winkelblech,
- H. M. Wilson and
- C. E. Bay2
The interaction of time of planting and plow-plant and conventional methods of seedbed preparation for corn (Zea mays L.) was evaluated over a 6-year period on Honeoye silt loam at Marcellus, N. Y. Planting dates ranged from early May to early June. While there was some tendency for relative grain yields to be slightly higher for plow-plant than for conventional with early planting, and slightly lower with late planting, the interaction was not statistically significant. For late planting, however, there is more likelihood of below optimum soil moisture with plow-plant under the conditions of this experiment than with the conventional method. This is associated with the longer period for moisture removal by the sod or cover crop preceding corn, and the likelihood of critically low moisture should be less where sod or cover crops are not involved. In only 1 year were yields (adjusted to 15% moisture) higher for late May or early June planting than for earlier planting.
Temperature was the dominant factor determining early growth. The correlations between corn heights 34 days after planting, and mean air temperatures for the 34 days, were highly significant. Final grain yields and percentages of dry matter in ears at harvest were significantly correlated with plant heights in mid-July.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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