Date of Award:

5-1952

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Soil Science

Committee Chair(s)

D. W. Thorne

Committee

D. W. Thorne

Abstract

Chlorosis of the foliage of higher plants has constituted a severe fertility problem in many areas of the world. It has been reported in no less than 30 countries. It has manifested itself in the western states and has usually been associated with a high CaCO3 content in the soil.

This chlorosis does not always result from lack or unavailability of one of the essential elements, but can result from several conditions around the plant roots or psychological processes taking place within the plant. Both the absence of iron in the Boil and conditions which provoke its unavailability to the plants seem to have major roles in inducing a lowering of the chlorophyll-making potential, in stunting growth, and causing necrosis of plants in extreme cases.

In general, chlorosis seems to increase as the growing season elapses. which would indicate that the physiological age of plants plays a major role in. The uptake of certain elements and in their influence on the manufacture of chlorophyll by plants.

The problem considered here will be limited to the effects of age, and of calcium and bicarbonate ions on the uptake of iron by plants, and on chlorophyll formation. It is the hope of the author to determine which of the ions in the soil are conducive to "lime-induced chlorosis."

Great Northern beans were selected as experimental material in view of their susceptibility to typical "lime-induced chlorosis." These beans were grown in solution.

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