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Published in Soil Sci Soc Am J 34:49-56 (1970)
© 1970 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of the Sol-Gel Transformation in Clay-Water Systems on Biological Activity: II. Sodium Uptake by Corn Seedlings1

D. E. Baker and P. F. Low2

ABSTRACT

Homoionic Na- and K- clay were prepared from the < 2µ fraction of Wyoming bentonite. The Na- clay separately, or combined with the K-clay, was mixed with water to produce clay-water systems having different clay contents. These systems were extruded through a hypodermic needle to orient the particles within them. Thereafter, some of them were disturbed by tapping their containers on the laboratory bench. Then the following quantities were measured on all or part of them: viscosity, relative partial molar free energy, (F – F°), of NaCl, KCl and HCl, and water tension. It was found that the viscosity, the (F – F°) of HCl, and the water tension were decreased by disturbing the clay systems, whereas, the (F – F°) of both NaCl and KCl were increased. The physical significance of these changes was discussed.

Samples of the Na- clay systems were mixed with 22Na and extruded around the radicles of corn seedlings (Zea mays L.). Then Na+ uptake was determined by analyzing the seedlings for 22Na. It was found that Na+ uptake increased curvilinearly with Na- clay content in the range 0–4% clay and then leveled off. In the curvilinear range, Na+ uptake was directly proportional to the (F – F°) of NaCl. Combined samples of Na- and K- clay were also mixed with 22Na and extruded around the radicles of corn seedlings. The K- clay was used to maintain consistency and yet dilute the Na- clay enough so that the seedlings would respond to changes in the (F – F°) of NaCl. As before, some of the systems were disturbed by tapping. It was found that Na+ uptake was greater from the disturbed than from the undisturbed systems. And since the disturbance also increased the (F – F°) of NaCl, it was concluded that Na+ uptake depended on this quantity.

NOTES

1 Joint publication of the Penn. Agr. Exp. Sta., University Park (Journal Paper 3458 on 8-12-68) and Purdue Univ. Agr. Exp. Sta., Lafayette, Ind. (Journal Paper 3679). Contribution from the Departments of Agronomy, The Penn. State Univ. and Purdue Univ. Presented before Div. S-2, Soil Science Society of America, Nov., 1968, at New Orleans, La. The authors are grateful for the assistance of Leon Marshall and Ann Jarrell, Research Aides in Soil Chemistry, The Penn. State Univ., in the preparation of the clays and the statistical analyses of the experimental results.

2 Associate Professor of Soil Technology, The Penn. State Univ. and Professor of Soil Chemistry, Purdue Univ.

Received for publication April 29, 1969. Accepted for publication September 15, 1969.






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