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Effect of Feedlot Manure on Soil and Water Quality¹

ABSTRACT

Research was conducted (i) to determine the contribution of representative feedlots in semiarid southern Alberta to soil and water pollution, and (ii) to determine the effect of long-term applications of manure on the N, P, and soluble salt content of cultivated soil under irrigation.

The NO₃-N and available P content of the surface soil adjacent to the feedlots was generally greater than that of the soil away from the feedlots, but at depths greater than 150 cm the differences were usually small. Similarly, the concentration of NO₃-N and P in the ground water at 1- to 5-m depths was usually increased only adjacent to the feedlot and, with minor exceptions, remained within "safe" limits most of the time. There was no evidence that a small lake or three permanent streams near feedlots were polluted by effluents from the feedlots.

Manure applied annually for 40 years at a rate of 70 metric tons/ha did not cause an undesirable buildup of N, P, or soluble salts in the soil.

Key Words: feedlot wastes • animal wastes • groundwater pollution • nitrate accumulation

¹ Contribution from Research Station, Canada Department of Agriculture, Lethbridge, Alberta T1J 4B1.

² Research Scientists.

Received for publication December 12, 1972.

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