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Effect of Manure and Irrigation on Sodium Bicarbonate-Extractable Phosphorus¹

ABSTRACT

Data for the NaHCO₃-extracted P in soil samples taken at the end of a 4-year field experiment on a Hanford sandy loam (Typic Xeror-thent) are presented. The main variables consisted of six rates of manure combined with two rates of irrigation water. The extractable P in the 0- to 0.3-m depth increased for all manure rates. At the 0.3- to 0.6-m and 0.6- to 0.9-m depths, increases were found for only the highest rates. At the 0.9- to 1.2-m depth there was a statistically significant increase only with the highest rate for the low irrigation treatment. The extractable P was consistently lower in the 0- to 0.3-m depth for the high irrigation. At the lower depths there was a suggestion of higher extractable P with the high irrigation, but this effect was not consistent. The P in a fresh liquid manure appeared to move more readily into lower soil depths than a solid corral weathered material.

¹ Contribution from the Dep. of Soil and Environ. Sciences, Univ. of Calif., Riverside, CA 92521.

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

Received for publication February 26, 1981. Accepted for publication April 10, 1981.

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