Abstract
French bean seedlings grown on choline, ammoniacal and nitrate forms of nitrogen together with equivalent basal application of P as KH2PO4 were tested for nutrient uptake from the rhizosphere. Statistical tests on soil (rhizosphere and non-rhizosphere) and plant (root and shoot) revealed that with the exception of P, levels of all other estimated macro-(Na+, K+, Ca2+, Mg2+) and micro-nutrients (Fe2+, Mn2+, Zn2+) were significantly changed after 42 days growth as compared to 21 days growth period. The higher uptake into shoots of Na+, K+, Fe2+, Mn2+, Zn2+ and H2PO4 − and higher biomass accumulation in the rhizosphere were associated with lower rhizosphere pH. The uptake of Ca2+ and Mg2+ increased with higher rhizosphere pH. While ammoniacal and choline forms decreased rhizosphere pH and increased the P uptake, nitrate form reversed the trend showing significant inverse relationship between shoot phosphate and rhizosphere pH. Calcium and iron were associated with an inhibition of the translocation of P from root to shoot. However, no causal relationships could be established. Both shoot weight and shoot P content were closely associated with a number of rhizosphere soil parameters.
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The paper forms a part of the Ph. D thesis submitted by the first author to the University of Wales, 1977.
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Sarkar, A.N., Wyn Jones, R.G. Influence of rhizosphere on the nutrient status of dwarf French beans. Plant Soil 64, 369–380 (1982). https://doi.org/10.1007/BF02372520
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DOI: https://doi.org/10.1007/BF02372520