The Current Mineral Nutrient Content of the Plant Solution as an Index of Metabolic Limiting Conditions

COMPOSITION OF CURRENT AND PREVIOUS SEASON'S BRANCH GROWTH IN RELATION TO VEGETATIVE AND REPRODUCTIVE RESPONSES IN PYRUS MALUS L

“…ELEMENTS WITH RESPECT TO TIME The experiences of the last decade (18,46,47,69,85,86,87,88,89,90,91,174,201) have confirmed and extended the value of the earlier investigations (230,231) in which the concentration of certain elements or groups of elements was determined in the metabolically active tissues at critical periods in their vegetative development. Investigations of this type have proved of special service in the diagnosis of the nutritive conditions produced in plants by the application of different combinations of the principal nutrient elements.…”

Variations in Potassium Content of Alfalfa Due to Stage of Growth and Soil Type and the Relationship of Potassium and Calcium in Plants Grown upon Different Soil Types1

“…While it has been largely observed that the addition of various mineral nutrients to the soil as fertilizer generally results in an increased amount of these elements in the plant (8,13,14), it has also been noted that the addition of calcium to the soil brings about a decrease of the amounts of potassium present in plants.…”

Comparison of Existing Methods for the Determination of Ammonia Nitrogen and Their Adaptability to Plant Juice

“…(WITH ONE FIGURE) Introduction In 1927 GILBERT and HARDIN (4), and later GILBERT and SMITH (5), published data showing that there is a correlation between soil fertility and the chemical composition of expressed plant juice. MCCooL and WELDON (7) and PETTINGER (8) in more recent work have substantiated the findings of GILBERT et al The juice work of the Rhode Island workers has recently been extended to include the estimation of a number of the nitrogenous fractions.…”