Plant phosphorus uptake

C) Plant phosphorus uptake is dependent on [Pjoi]. Sorption and desorption of P in response to changes in [Psq]] are considered (Eq. (6). 

Jakobsen, I., Leggett, M.E. and Richardson, A.E. (2005) Rhizosphere microorganisms and plant phosphorus uptake. In Sims, J.T. and Sharpley, A.N. (eds) Phosphorus, Agriculture and the Environment. American Society of Agronomy/Soil Science Society of America, Madison, Wisconsin (in press). 

P. C. R. Fontes, S. A. Barber, and G. E. Wilcox, Prediction of phosphorus uptake by two tomato cultivars growing under sufficient and insufficient phosphorus soil conditions using a mechanistic mathematical model. Plant Soil. 94 81 (1986). 

R. F. Grant and J. A. Robert.son, Phosphorus uptake by root systems mathematical modelling in ecosys. Plant Soil 188 219 (1997). 

M. Silberbush and S. A. Barber. Sensitivity of simulated phosphorus uptake to parameters used by a mathematical model. Plant Soil 74 93 (1983). 

Gillespie AR, Pope PE (1989) Alfalfa N2-fixation enhances the phosphorus uptake of walnut in interplantings. Plant Soil 113 291-293... 

Schachtman DP, Reid RJ, Ayling SM (1998) Phosphorus uptake by plants from soil to cell. Plant Physiol 116 447-453. doi http //www.plantphysiol.org Schindler DW (1974) Eutrophication and recovery in experimental lakes implications for lake management. Science 184 897-899. doi http //www.sciencemag.org/cgi/content/abstract/184/4139/897 Schindler DW, Hecky RE, Findlay DL, Stainton MP, Parker BR, Paterson MJ, Beaty KG, Lyng M, Kasian SEM (2008) Eutrophication of lakes cannot be controlled by reducing nitrogen input results of a 37-year whole-ecosystem experiment. Proc Natl Acad Sci USA 105 11254-11258. doi http //www.pnas.org/content/105/32/l 1254.abstract Scott JT, Condron LM (2003) Dynamics and availability of phosphorus in the rhizosphere of a temperate silvopastoral system. Biol Fert Soils 39 65-73 Shane MW, Lambers H (2005) Cluster roots a curiosity in context. Plant Soil 274 101-125. doi http //dx.doi.org/10.1007/s 11104-004-2725-7... 

Buchan [92] has carried out a study using electron microscopy combined with energy dispersive X-ray analysis, to determine the location and nature of the stored phosphorus in activated sludge samples from seven different treatment plants in South Africa, which all show enhanced phosphorus removal. The results indicate that there is a biological mechanism of enhanced phosphorus uptake in activated sludge. 

Phosphorus in the form of phosphate is the principal source of P for plants. Phosphorus is commonly applied in fertilisers although its uptake by plants is much less than that of N and K and its availability is one of the most common nutritional limitations to crop yield (Bould etal., 1983). Some of the P in soils and soil solutions may be present in organic compounds. However, it is unlikely to be available to plants in its organic form and decomposition of organic matter releases P in its available... 

Hocking, P. J. (2001). Organic acids exuded from roots in phosphorus uptake and aluminum tolerance of plants in acid soils. Adv. Agron. 74, 63-97. 

Thus, the simulations here suggest that for tropical soils such as oxisols and ultisols which contain an appreciable pool of labile sorbed phosphorus, the transfer of phosphorus from this pool to the soil solution in response to increased rates of P uptake by plants serves to more or less maintain soil phosphorus concentrations. This allows the increased rates of phosphorus uptake by fiister growing vegetation to continue. 

Schachtman, D. R, Reid, R, J., and Ayling, S. M, (1998). Phosphorus uptake by plants from soils to cell. Plant Physiol. 116, 447-453. 

The productivity of many ecosystems is determined by the chemical stability of phosphate, its relative immobility in soil, and its low concentration in the soil solution (approximately 1 xM). Phosphorus uptake by plant roots occurs mainly as phosphate ions (H2P0 and HPO ) from the soil solution, which depends on the solubilization of mineral phosphates and the degradation or mineralization of organic phosphorus. During phosphate uptake, a phosphorus-depleted area is formed close to the root, since phosphate uptake is faster than its diffusion in soil (Bhat and Nye, 1973). Having... 

Plants therefore possess a number of adaptive features that enhance phosphorus acquisition from soil and these are postulated to be important mechanisms by which the efficiency of phosphorus uptake by plants may be improved. The ability of plants to obtain phosphate from soil organic phosphorus is of particular significance because, in most soils, organic phosphorus is a substantial component of the total soil phosphorus. 

Phosphorus uptake by plants and response to phosphorus deficiency... 

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