Distribution of residual soil moisture and nitrates in relation to the border effect of corn and sorgo
1937
Conrad, J.P.
Where growing conditions were very similar to those under dry-farming, plants in rows bordering on uncropped areas yielded more than did plants in inner rows. Soil samples taken in planes perpendicular to the crop-fallow boundary lines showed a definite use of soil moisture 6 feet away laterally with sorgo and 4 feet away with corn, and a definite use of nitrates 4 feet away laterally with both crops. Under the main body of the crop corn plants gave evidence of definite absorption of moisture from the ninth foot depth and of nitrates from the eighth foot, while sorgo gave evidence of absorption of moisture from the twelfth foot and of nitrates from the tenth foot. The differences between these crops as disclosed in this study may not be of fundamental nature but may be only differences in degree. It is possible that the conditions as found for sorgo and corn might have been reversed had a much less vigorously growing variety of sorgo and a much more vigorously growing variety of corn been used.
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