Summary
The manganese content of sugar beet grown in pots of organic soils taken from fields where crops regularly show symptoms of manganese deficiency, and the effects on it of foliar sprays of manganous sulphate and of manganous oxide or manganese silicate frit applied to the soil, of changing the soil pH, air-drying the soil, and growing the plants either in the glasshouse or outside were determined. All the manganese treatments increased the concentration of manganese in the plants and decreased deficiency symptoms, but increased the dry matter yield only slightly. Increasing the pH by liming greatly increased symptoms and decreased the manganese concentration in the dry matter; air-drying the soil before cropping had the opposite effect. Plants grown in pots of the same soil in the glasshouse or outdoors showed similar symptoms and had similar manganese content.
The concentration of manganese in the leaves was related to the percentage of plants with deficiency symptoms and to the concentration of ‘active’ soil manganese. Leaves usually had symptoms when the concentration of manganese in the dried leaves was less than 30 ppm, and always had severe symptoms when they contained less than 15 ppm Mn. The soil analyses suggest that sugar beet grown in organic soil with pH greater than 7.0 and containing less than 40 ppm ‘active’ soil manganese is likely to show deficiency symptoms.
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Farley, R.F., Draycott, A.P. Manganese deficiency of sugar beet in organic soils. Plant Soil 38, 235–244 (1973). https://doi.org/10.1007/BF00779008
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DOI: https://doi.org/10.1007/BF00779008