Nutrient deficiencies diagnosed with foliar analyses and plant tissue tests
1950
Lynd, J.Q. | Turk, L.M. | Cook, R.L.
Corn and beans were grown in the greenhouse on soils varying widely in natural fertility. Corn was grown also in the field on one of the soils used in the greenhouse. Varying fertilizer treatments resulted in plants which were greatly different in nutrient status. Foliar analysis and green tissue testing were compared as methods of studying the nutrient status of soils. Results obtained in tissue testing reflected soil fertilizer treatments of nitrogen, phosphorus, and potassium on soil types differing widely in physical and chemical characteristics. A method for determining weak acid soluble manganese in fresh tissue was found to give a good indication of the total manganese present in the foliage of white bean plants. The third functioning basal leaf of corn plants, as used in the tissue tests and foliar analyses, was found to be a reliable indicator of fertilizer treatment. Periodic foliar analysis of corn plants indicated that plants change in composition as the season progresses. Because of this steady change, it is difficult to select by visual means alone plants comparable in physiological maturity from several different soil treatments. Some physiological basis for selecting and sampling comparable plants, other than visual estimation, is needed practical interpretations are to be made of analytical results. It is believed that green tissue tests may be useful in serving this need.
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