University of California

Potassium and lemon fruit size: Larger sizes obtained in soil cultures when potassium was increased and calcium decreased in laboratory experiments


A. R. C. Haas
Joseph N. Brusca

Authors Affiliations

A. R. C. Haas is Plant Physiologist, Emeritus, University of California, Riverside; Joseph N. Brusca is Principal Laboratory Technician, University of California, Riverside.

Publication Information

Hilgardia 9(9):13-14. DOI:10.3733/ca.v009n09p13. September 1955.

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Tests on the effect of potassium and calcium soil fertilization on lemon fruit size—made when the fruit was in the silver stage of maturity—showed that the potassium-calcium ratio in the nutrient was effective in bringing about a marked response in the potassium and calcium content in the peel and pulp. Comparative results obtained with lemon flowers also indicated that the period of flowering and fruit setting can be of considerable importance in setting the pattern of mineral nutrition to be followed in the fruit until maturation occurs.

Haas A, Brusca J. 1955. Potassium and lemon fruit size: Larger sizes obtained in soil cultures when potassium was increased and calcium decreased in laboratory experiments. Hilgardia 9(9):13-14. DOI:10.3733/ca.v009n09p13

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Use of pest control chemicals: Public law No. 518 effective July 22, 1955, of concern to all growers, shippers using pesticide chemicals on farm products

Minor nutrients of citrus: Effects of phosphorus fertilization on the minor element nutrition of citrus studied with three types of soil series

New soil fumigant: Increased growth of crop plants with weed killer of low toxicity to humans

Double-flowered column stocks: Genetic crossover responsible for breakdown in percentage of doubles produced by succeeding generations of parent variety

Verticillium wilt resistance: Strawberries resistant to verticillium wilt also show resistance to powdery mildew in plant disease studies

Almond varieties on plum roots: Plum rootstocks being tested for suitability to almonds in wet areas or in soils infected with oak root fungus

Effective use of living shade: Studies show how selection and location of trees and shrubs can reduce extremes of summer temperatures in living areas

Citrus collection for research: Citrus relatives, species, varieties, strains, and hybrids provide materials for research on problems of citriculture

New mite predators: Four species from Guatemala show promise in southern California.

Factors influencing the effectiveness of sodium chlorate as a herbicide

The toxicity of sodium arsenite and sodium chlorate in four California soils

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