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Rates of Nitrate Uptake with Sudangrass and Microbial Reduction in a Field¹

ABSTRACT

Removal of nitrate from a field soil by sudangrass (Sorghum sudanense) and by conversion by microorganisms are accounted for with the aid of a convective dispersion equation with a sink term. Rates of nitrate disappearance from the soil showed sharp increases associated with irrigation or rainfall and seemed to decrease exponentially with soil moisture potential. Leaching displayed similar increases which subsided three to four days after irrigation. Plant uptake accounted for about 50% of added nitrate, organic matter and residual nitrate for about 34%, leaching for another 4%, and the balance was unaccounted for. While a nitrate balance showed a percentage distribution of nitrate in a soil-plant system, rate measurement revealed a time-dependent function for the plant uptake of nitrate in the system which is essential for stochastic or mechanistic model studies.

¹ Contribution from Dep. of Soils and Plant Nutrition, College of Natural Resources, Univ. of California, Berkeley. The research was supported by RANN of the National Science Foundation, Grant No. GI34733X.

² Assistant Research Chemist, Univ. of California, Berkeley, Assistant Research Soil Physicist, Univ. of California, Riverside, and Professor of Soil Biology and Biochemistry, Univ. of California, Berkeley, respectively. The present address of the senior author is Center for the Biology of Natural Systems, Washington Univ., St. Louis, MO 63130.

Received for publication August 16, 1976. Accepted for publication April 14, 1977.

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