SUMMARYPlant:soil ratios (CRs) of 85Sr concentration were studied in wheat, lucerne, lettuce, radish, string bean (Phaseolus vulgaris), and cucumber grown in pots in eight Greek soil types in a glasshouse pot experiment in 1989.The CRs of the crops and of the plant parts studied differed according to soil type. They ranged from 0·034–1·39 for wheat grains to 7·6–36·5 for cucumber stems and leaves. The CRs of the edible parts were much lower than those of the other plant material.The correlation between CRs and clay content was negative and, in most cases, significant (P = 0·05–0·01) or highly significant (P < 0·01). The negative correlation improved (higher absolute value of r, lower variability) if clay plus silt content or cation exchange capacity was used instead of clay content.The correlation between CRs and soil properties was greatest for soil pH (r = –0·89) and decreased in the order: pH > total clay plus silt ≃ cation exchange capacity > total clay.
The relationship between values of 85 Sr concentration ratios (CRs) and exchangeable bases, expressed in absolute (mmol/kg) or relative (percentage of cation exchange capacity (CEC)) terms, was considered using the results of a glasshouse pot experiment conducted in 1989, for soils and crops of Greece. Exchangeable calcium, expressed in mmol/kg, presented, in most instances, a significant (P = 005-001) or highly significant (P < 001) negative correlation with the CRs of various crops or plant parts, while exchangeable calcium plus magnesium or total exchangeable bases (expressed also in mmol/kg) showed an even better correlation (higher values of r, lower variability). Expression of the amounts of exchangeable bases in relative terms further improved the correlation coefficient in each comparison. The correlations between the percentage of exchangeable (Ca + Mg) or exchangeable bases and CRs, which were always negative, were significant or highly significant for all tested crops or plant parts. The correlation between CRs and soil properties was greatest for exchangeable (Ca + Mg) expressed as a percentage of CEC (r = -0-92) and followed the order: Exchangeable (Ca + Mg) as % of CEC « exchangeable bases as % of CEC > exchangeable (Ca + Mg) in mmol/kg « exchangeable bases in mmol/kg > exchangeable Ca as % of CEC > exchangeable Ca in mmol/kg.Quantitative relationships between CRs of the tested crops or plant parts and exchangeable calcium plus magnesium (% of CEC) of soils are also presented.
SUMMARY
Rhizobium meliloti strains have been isolated from salt‐affected, non‐cultivated soils of Greece. The effectiveness of the isolates was investigated in test‐tubes using nitrogen‐free salts agar or soil. In the latter case a new simple and rapid technique was used during which plants of Medicago saliva were grown in large test‐tubes containing salt‐affected soil under controlled sterile conditions. Field trial measurements in salt‐affected soils indicate a good response to inoculation.
The status and the distribution of the macro‐ and certain of the micronutrients in selected soil profiles developed on different parent materials such as granite, quartz diorite, dacite, and marble and under varying cover such as spruce (Picea excelsa L.), scotch pine (Pinus silvestris L.), beech (Fagus silvatica L.), and grasses were investigated.The results presented in a series of graphic illustrations indicate a distinct tendency for an accumulation of the nutrient supply in the uppermost horizons of the studied profiles.The nutrient level is influenced by the initial capital of the elements and the alteration to which it has been subjected during soil development processes.Interactions between the biotic and the edaphic parameters affect the distribution of the nutrients within the profiles.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.