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Effects of cadmium and nickel on in vivo carbon dioxide exchange rate of pigeon pea (Cajanus cajan L.)
Authors:I. S. Sheoran  Nidhi Aggarwal  Randhir Singh
Affiliation:(1) Plant and Soil Science, Community Research Service, Kentucky State University, 40601 Frankfort, KY, USA
Abstract:Effects of acidic soil factors (Al, H-ion, Mo, and Mn) upon the soybean (Glycine max (L.) Merr. cv. Essex)/Bradyrhizobium japonicum symbiosis were examined in acidified soil. Plants were grown under full sunlight in pots containing N-deficient soil (pH 6.7) or similar soil amended with sufficient Al2(SO4)3 or elemental S to give soil pH values of 4.8 and 4.6, respectively, and water-extractable Al levels of 30 and 14 mgrM, respectively. Other treatments consisted of the addition of inorganic N or inoculation with commercial or locally-isolated B. japonicum. Acidification did not reduce shoot or root weights of plants receiving inorganic N but reduced (Ple0.05) shoot and root dry weights, nodule dry weights and numbers, shoot N concentrations, and chlorophyll levels of inoculated plants. Shoot dry weights and nodulation of inoculated plants were greater (Ple0.05) in Al2(SO4)3-amended soil than in S-amended soil. Addition of Mo was not beneficial. It was concluded that reduced plant growth was caused by the effects of acidified soil on nodulation and that H-ion toxicity was probably the most limiting factor. Effects of Al, Mn, or Mo appeared less likely.
Keywords:acidity  aluminum  Bradyrhizobium japonicum  Glycine max  nitrogen fixation  salinity  soybean  symbiosis
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