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Sodium Availability in Nonalkali Soils¹

ABSTRACT

Ryegrass (Lolium multiflorum) was grown in the greenhouse on undried soil samples from the 0 to 15 and 30 to 45 cm depths of 15 Iowa soils. The NH₄OAc exchangeable Na was 21 ppm or less in all soil samples except those from the 30 to 45 cm depth in southern Iowa soils, which contained 28 to 115 ppm exchangeable Na. The pH of these southern Iowa subsurface samples varied from 5.1 to 6.0. Percentages of Na in the first harvest of ryegrass were directly related to the exchangeable Na contents of the soils and inversely related to exchangeable soil K and K content of the plants. Plant contents of Na increased in succeeding harvests as the available K in the soil samples was decreased by crop removal. Total uptake of Na in six harvests of ryegrass was equal to the content of exchangeable Na initially present in the potted soil samples.

¹ Journal Paper no. J-7891 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Iowa 50010. Project no. 1899.

² Former Graduate Student and Professor of Agronomy, respectively.

Received for publication May 1, 1974. Accepted for publication November 5, 1974.