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Cadmium in arable crops

the influence of soil factors and liming

Jansson, Gunilla (2002). Cadmium in arable crops. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 341
ISBN 91-576-6192-8
[Doctoral thesis]

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Abstract

The aims of this thesis were to investigate (i) the influence of soil factors on Cd concentration in carrots, (ii) the effects of lime on Cd solubility in soils and on Cd concentrations in crops, (iii) the correlation between Cd concentrations in crops in liming experiments and soil factors, i.e. Cd species in soil solution and soil extracts. Common arable crops, carrots and associated soils, soils and saturation extracts from eight liming experiments were studied. The soil pH was the best predictor of carrot Cd concentration. Liming had inconsistent effects on crop Cd concentrations. There was a decrease in crop Cd at sites with high crop Cd concentrations, but at sites with low Cd the Cd concentration in the crop increased. The Cd2+ solubility in the soils investigated was mainly controlled by soil pH and there was no detectable increase in Cd solubility due to additions of Ca(NO3)2 or of lime at higher pH levels. At sites with low crop Cd concentrations, the concentration of Cd in soil solution and batch extracts was also low. This indicates a low availability of metals in the soil, which can lead to micronutrient deficiency and a resultant decrease in biomass or to a release of exudates and a resultant increase in metal bioavailability. There were both visible Mn-deficiency symptoms and/or yield decreases in two of the experiments. It is probable that both plant factors and soil factors affect the solubility and availability of Cd. The Cd concentrations in crops were different between sites and in most cases larger than the effect of liming. The correlation between parameters in the saturation extracts and crop Cd was poor. Hence, analysis of soil solution extracts proved not to be a good tool for predicting crop Cd concentrations at low Cd concentrations in the soil solution. The recommendation coming out of this thesis is to lime soils that have low soil pH and that are known to give high Cd concentrations in crops. Soils with low pH and low crop Cd concentrations should only be given minor or no additions of lime. The thesis also indicates that site selection may be more effective than liming in managing crop Cd.

Authors/Creators:Jansson, Gunilla
Title:Cadmium in arable crops
Subtitle:the influence of soil factors and liming
Year of publishing :April 2002
Volume:341
Number of Pages:41
Papers/manuscripts:
NumberReferences
ALLI. Jansson, G. & Öborn, I. 2000. Cadmium content of Swedish carrots and the influence of soil factors. Acta Agriculturæ Scandinavica Section B, Soil and Plant Science 50, 49-56. II. Jansson, G. & Öborn, I. Effects of liming on cadmium concentrations of potato tubers, cereal grains and straw. Journal of Environmental Quality (submitted). III. Jansson, G., Berggren, D. & Öborn, I. Effects of liming, pH and Ca 2+ concentration on Cd solubility in four agricultural soils (manuscript). IV. Jansson, G., Öborn, I. & Smolders, E. Cd concentrations in crops related to different soil factors (manuscript).
Place of Publication:Uppsala
Associated Programs and Other Stakeholders:Z - SLU - Libray > Odla mera
ISBN for printed version:91-576-6192-8
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P35 Soil fertility
F Plant production > F61 Plant physiology - Nutrition
P Natural resources > P33 Soil chemistry and physics
Subjects:Not in use, please see Agris categories
Agrovoc terms:cadmium, arable soils, edaphic factors, plant soil relations, daucus carota, triticum aestivum, solanum tuberosum, liming, application rates, soil ph, soil solution, solubility, sweden
Keywords:carrots, cereals, potatoes, pH, soil Cd, soil solution, Cd solubility, Ca 2+ competition, site selection, saturation extracts
ID Code:232
Department:(NL, NJ) > Dept. of Soil Sciences
Deposited By: Staff Epsilon
Deposited On:11 Apr 2003 00:00
Metadata Last Modified:22 Mar 2015 15:13

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