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Utah State University (1965)

Effect of Calcium Availability on Alfalfa Grown in Calcareous High Sodium Soils

Nightingale Harry Irving

Titre : Effect of Calcium Availability on Alfalfa Grown in Calcareous High Sodium Soils

Auteur : Nightingale Harry Irving

Université de soutenance : Utah State University

Grade : Doctor of Philosophy (PhD) 1965

Résumé
The major objectives of this investigation are to evaluate the influence of high soil Na on the availability of soil Ca to alfalfa plants, and the influence of availability of Ca on the growth and cation balance in alfalfa leaves, petioles, and stems. To accomplish the objectives of this investigation a split root culture unit was developed that would allow the establishment of alfalfa plants in 1300 g non-sadie soil containing Ca45 in an upper soil compartment separated from a lower nutrient-solution compartment by a tar-paraffin membrane. Such a culturing system eliminates the difficulty of trying to establish plants in high Na soils ; consequently, fairly uniform stands of alfalfa were initially created prior to the soil Na treatments and changes in the concentration of available Ca from the nutrient solutions. The main experiment was designed to obtain alfalfa shoots that could be separated into leaves, petioles, and stems with subsequent chemical analysis under three sets of conditions" These growth conditions were : (a) prior to soil Na treatments and changes in Ca content of the nutrient solutions, (b) increased levels of soil Na but stil  sufficient Ca in nutrient solutions, and (c) increased levels of soil ta but insufficient supply of Ca in the nutrient solutions, The soils were analyzed before and after growth of plants. The nutrient solutions associated with each growth period were analyzed before and after exposure t o plants. Evaluation of experimental results were by analysis of variance, linear correlations, and multiple regression analysis.

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