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Water and Solute Movement in Svea Loam for Two Water Management Regimes¹

ABSTRACT

Soil water and soil solute movement were investigated in a sub-humid environment over a 3-month period for two water regimes. Ammonium nitrate and KCl were broadcast on duplicate 3.7-m square plots. Each plot was irrigated with 6 to 10 cm of water at 7- to 14-day intervals. One plot was covered to prevent exchange of water at the soil surface (covered plot) while the second remained bare and was thus subjected to the prevailing environmental conditions. Soil water flux and unsaturated hydraulic conductivity values were calculated using soil water pressure and water content data from the covered plot. Analyses of soil solution collected from 30-, 61-, 91-, 122-, and 152-cm depths for NO₃-N and Cl revealed that, for the environmental conditions encountered (35 cm pan evaporation and 15 cm rainfall), downward movement of ions was nearly 1.5 times greater for the covered compared with the bare plot. The solute did not move with the soil water in a one to one relationship for either plot.

¹ Journal Paper no. 279, North Dakota Agr. Exp. Sta., Fargo. Contribution from Dep. of Soils. Presented before Div. S-1 Aug. 26, 1970, at Tucson, Ariz.

² Associate Professor of Soil Science, Department of Soils, North Dakota State University, Fargo 58102.

Received for publication March 25, 1971. Accepted for publication June 1, 1971.