Relation of Weather to the Influence of Hay Crops on Subsequent Corn Yields on a Chalmers Silt Loam
1972
Barber, Stanley A.
The effect of bay crops [alfalfa (Medicago saliva L.), bromegrass (Bromus inermus L.), and a mixture of the two] on soil productivity as measured by corn (Zea mays L.) yields was investigated in field experiments conducted from 1952 to 1969. Corn following hay yielded more than corn following corn. The greater the number of years of corn subsequent to hay, the lower the corn yield. There was a negative linear correlation between corn yield and log of year of corn subsequent to hay. The slope of this relation varied with year and was correlated with 8-week precipitation and 4-week degree days following corn planting. The slope was greater as precipitation decreased below 15 cm or increased above 20 cm and also as degree days increased.
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