Composition and Solubility Behavior of A Commercial Trace-Nutrient Glass

Boron Supplements, Response of Alfalfa to Applications of a Soluble Borate and a Slightly Soluble Borosilicate Glass

“…In a lime treatment, equal molecular amounts of calcium hydroxide and magnesium oxide, equivalent in total to 2200 pounds of calcium carbonate per acre (weight basis), were mixed thoroughly with the soil. The cultures were kept in a moist condition for 4 weeks to permit equilibration with the lime; the average pH attained was 6.9. The general fertility status was raised at this time to a suitable level for good growth by Supplemental potassium, equivalent to 100 pounds of potassium oxide per acre, was added shortly after the second harvest.…”

“…The possible advantages of slightly soluble substances, as carriers of boron (or other trace nutrients), has been the subject of a number of recent investi-1 Present address, Department of Chemistry, Union College, Lincoln, Neb. gations (4)(5)(6)(7)(8)71).…”

Response of Alfalfa to Boron Fertilization of Sundry Acid and Calcareous Soils in a Greenhouse Study1

“…M ANY crops receive annual applications of boron, generally in the form of borax. Recent studies ( 4,8,10) indicate a change in interest towards less reactive compounds that may supply the boron requirements over a longer period without danger of boron toxicity. Preliminary to an investigation of borosilicate glass as a continuing source of boron for alfalfa (5, 6, 7), a study was conducted to evaluate response of alfalfa in greenhouse culture to boron fertilization of ten soils from different geographic regions in the United States.…”