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Potassium Accumulation and Movement In an Irrigated Soil Treated With Animal Manures¹

ABSTRACT

Data from a 4-year experiment with animal manures are reported. Soluble and exchangeable K and K/Cl ratios indicated that K moved into the 90- to 120-cm depth, but little if any moved below the 120-cm depth. Potassium/Cl ratios indicated that K moved down in a relatively abrupt front, that the 0- to 30-cm and 30- to 60-cm depths had nearly equilibrated with the K input, but that deeper layers had not. Soluble K accumulated in the soil in proportion to the amount of manure added and reached a maximum of 36.5% of the total soluble cations in the saturation extract of the surface layer of the plots that received the highest rate of manure. The maximum exchangeable K was found in the 30- to 60-cm depth of the same plots. The K fixed in the soil appeared to be greater than the reduction in CEC.

¹ Contribution from the Dep. of Soil and Environ. Sci. Univ. of Calif., Riverside; financial support from USDA-ARS through Cooperative Agreement USDA no. 12N14-100-10431 (41) and Western Consumer-Industries, Inc., through a Grant-in-Aid, is hereby gratefully acknowledged.

² Professor of Soil Science and Staff Research Associate, respectively.

Received for publication May 6, 1977. Accepted for publication August 8, 1977.