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Published online 1 September 1968
Published in Agron J 60:563-565 (1968)
© 1968 American Society of Agronomy
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Cumulative Effects of Irrigation and Fertilizer on Soil Fertility1

M. T. Vittum, D. J. Lathwell and G. H. Gibbs2

Irrigating Lima and Kendaia silt loam soils with an average of 10.7 cm of water each year for 13 years caused no change in soll pH, organic matter, or available P, Ca, and Mg. Irrigation significantly reduced available K from an average of 109 kg/ha in nonirrigated plots to an average of 97 kg/ha in irrigated plots.

Applying an extra 30 kg of P and 54 kg of K per hectare each year for 14 years significantly reduced soil pH, had no effect on organic matter, Ca, or Mg, and significantly increased available P and available K. At the end of the experiment, normal fertility level plots contained 25 and 96, and high fertility level plots contained 37 and 109 kg of available P and K per hectare, respectively.

Key Words: soil tests • phosphorus • potassium • water

1 Joint contribution from the Department of Vegetable Crops (Geneva) and the Department of Agronomy (Ithaca), N. Y. State College of Agriculture, Cornell University. Presented at the annual meeting of the Northeast Branch, American Society of Agronomy, June 27, 1967, at University Park, Pa. Agronomy Paper No. 807. Approved Mar. 22, 1968 by the Director of the NYSAES as Journal Paper No. 1632. This project was supported in part by Hatch Regional Research Funds, as a contributing project to NE-48: Soil-Plant-Water Relationships.

2 Professor of Vegetable Crops (Geneva) and Soil Science (Ithaca), Professor of Soil Science. (Ithaca), and Experimentalist in Vegetable Crops (Geneva), respectively.

Received for publication March 29, 1968.




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Environmental Quality		 The Plant Genome
Copyright © 1968 by the American Society of Agronomy.