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- W2030904538 abstract "SUMMARY K + uptakes from forty-four arable soils from England by 1 cm portions of the roots of intact onion seedlings during 10 days growth were measured. A single-split-root arrangement was used, enabling the determination of uptake by known surface area of the root. Transpiration was restricted to make K + diffusion in the soil the predominant supply mechanism. These were compared with calculated values using separately determined K + diffusion coefficients in the soils. Two methods were followed, namely ( a ) measuring K + diffusion to a hydrogen form of cation exchange resin paper and calculating diffusion coefficients assuming total depletion of the (ammonium acetate) exchangeable K + at the resin paper: soil boundary; and ( b ) deriving diffusion coefficients from estimated values of the impedance factor and the measured K + buffer power of each soil, for 50, 60, 90 and 100% depletion of the initial soil solution K + at the root:soil boundary. None of the predictions adequately accounted for the observed uptake. Calculations of the root:soil boundary concentrations showed a wide range of depletion. Soils with initial soil solution K + in the range 0.04–0.4 μmoles/ml were depleted of the solution K + to near zero or even less. A negative concentration of K + in solution indicates the probable contribution of non-exchangeable K + . When the initial soil solution K + was more than 0.4 μmoles/ml, the uptake of K + could be accounted for by 30–85 % depletion at the root:soil boundary. Partial and multiple regression of the measured uptake on the initial exchangeable K + content and the initial soil solution K + concentration were calculated. A simple relationship between the uptake and the exchangeable K + content accounted for about three-quarters the variance. The uptake was less closely associated with the K + in solution or its ratio to Ca 2+ + Mg 2+ in solution. These correlations are discussed from the diffusion point of view and in relation to the usually reported correlations from pot experiments. Potato yield response to K + fertilizer additions in field experiments are examined in relation to the supply of K + by diffusion in the soils. When K + uptake by 1 cm portion of onion root from the unfertilized soil exceeded l.2 μmoles/10 days, yield response to K + addition became erratic and occasionally negative." @default.
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- W2030904538 date "1969-08-01" @default.
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- W2030904538 title "An evaluation of the properties of soil potassium influencing its supply by diffusion to plant roots in soil" @default.
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- W2030904538 doi "https://doi.org/10.1017/s0021859600024072" @default.
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