Influence of rhizosphere on the nutrient status of dwarf French beans

• Published in: Plant and soil Vol. 64; no. 3; pp. 369 - 380
• Main Authors: Sarkar, A.N, Wyn Jones, R.G
• Format: Journal Article
• Language: English
• Published: Martinus Nijhoff/Dr W.Junk Publishers 01-10-1982
• Subjects: Agricultural soils; Chlorides; Clay soils; Nitrates; Nitrogen; Phosphates; Phosphorus; plant nutrition; Plants; Quaternary ammonium compounds; Rhizosphere; soil biology; soil science
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/bf02372520

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.