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A unifying concept for the dependence of whole-crop N:P ratio on biomass : theory and experiment

By Duncan J. Greenwood, Tatiana V. Karpinets, Kefeng Zhang, Angela Bosh-Serra, Arianna Boldrini and Lyudmila Karawulova

Abstract

Background and Aims: Numerous estimates have been made of the concentrations of N and P required for good growth of crop species but they have not been defined by any unifying model. The aim of the present study was to develop such a model for the dependence of the N : P ratio on crop mass, to test its validity and to use it to identify elements of similarity between different crop species and wild plants. \ud \ud Methods: A model was derived between plant N : P ratio (Rw) and its dry biomass per unit area (W) during growth with near optimum nutrition by considering that plants consist of growth-related tissue and storage-related tissue with N : P ratios Rg and Rs, respectively. Testing and calibration against experimental data on different crop species led to a simple equation between Rw and W which was tested against independent experimental data. \ud \ud Key Results: The validity of the model and equation was supported by 365 measurements of Rw in 38 field experiments on crops. Rg and Rs remained approximately constant throughout growth, with average values of 11·8 and 5·8 by mass. The model also approximately predicted the relationships between leaf N and P concentrations in 124 advisory estimates on immature tissues and in 385 wild species from published global surveys. \ud \ud Conclusions: The N : P ratio of the biomass of very different crops, during growth with near optimum levels of nutrients, is defined entirely in terms of crop biomass, an average N : P ratio of the storage/structure-related tissue of the crop and an average N : P ratio of the growth-related tissue. The latter is similar to that found in leaves of many wild plant species, and even micro-organisms and terrestrial and freshwater autotrophs

Topics: SB
Publisher: Oxford University Press
Year: 2008
OAI identifier: oai:wrap.warwick.ac.uk:275

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  1. (1978). (in Russian) 28Церлинг В.В. Агрохимические основы диагностики минерального питания сельскохозяйственных культур. М.: Наука,
  2. (2007). A dynamic model for the combined effects of N, P and K fertilizers on yield and mineral composition: description and experimental test. doi
  3. (1978). Agrochemical fundamentals of diagnostics of crop mineral nutrition.
  4. and 32 co-authors 2004. The worldwide leaf economics spectrum.
  5. (1982). Bases ecofisiológicas de la producción de cebolla (Allium cepa, L): Aportaciones para la mejora de las técnicas de cultivo en el Pla d’Urgell(Lleida). Available at: http://www.tesisenxarxa.net 21 Caloin
  6. (1964). Biology data book. Washington D.C.; Federation of American Societies of Experimental Biology doi
  7. (1993). Canopy nutrient allocation in relation to incident light in the tropical fruit tree Borojoa patinoi (Cuatr.).
  8. (1980). Comparisons of the effects of phosphate fertilizer on the yield and phosphate content and quality of 22 different vegetable and agricultural crops. doi
  9. (1997). Diagnosis of the nitrogen status in crops. doi
  10. (2002). Ecological Stoichiometry; the biology of elements from molecules to the biosphere. doi
  11. (1999). Ecophysiological basis for onion production (Allium cepa, L): A contribution to the improvement of agricultural practices in the Pla d’Urgell (Lleida). Doctoral Thesis. Universitat de Lleida,
  12. (2006). Ecosystem allometry: the scaling of nutrient stocks and primary productivity across plant communities. doi
  13. (1989). Experimental validation of an N-response model for widely different crops. doi
  14. (2007). Global analysis of nitrogen and phosphorus limitation of primary producers in freshwater, marine and terrestrial ecosystems. doi
  15. (1991). Growth rate and %N of field grown crops: theory and experiments.
  16. (2005). High nitrogen: phosphorus ratios reduce nutrient retention and second year growth of wetland sedges. doi
  17. (1975). Influence of mineral nutrition on photosynthesis and the use of assimilates.
  18. (2003). Interaction of nitrogen and phosphorus in determining growth. doi
  19. (1987). Maximizing daily canopy photosynthesis with respect to the leaf nitrogen allocation pattern in the canopy. doi
  20. (1997). N-uptake and distribution in plant canopies. In: doi
  21. (2004). N:P ratios in terrestrial plants: variation and functional significance. doi
  22. (1979). Nitrogen stress in birch seedlings.1.Growth technique and growth. doi
  23. (2005). Nitrogen/phosphorus leaf stoichiometry and the scaling of plant growth. doi
  24. (2000). Nutritional constraints in terrestrial and freshwater food webs. doi
  25. (1992). Nutritional disorders of plants. Development Visual and analytical diagnosis.
  26. (1996). Organism size, life history, and N:P stoichiometry. doi
  27. (2006). Phylogenetic and growth form variation in the scaling of nitrogen and phosphorus in the seed plants. doi
  28. (1992). Plant allocation and the multiple limitation hypothesis. doi
  29. (2006). Plant allometry, leaf nitrogen and phosphorus stoichiometry and interspecific trends in annual growth rates. doi
  30. (2005). Plant allometry, stoichiometry and the temperature-dependence of primary productivity. doi
  31. (1977). Relationship between plant weight and growing period for vegetable crops in the United Kingdom.
  32. (1980). Relationships between the critical concentrations of nitrogen, phosphorus and potassium in 17 different vegetable crops and duration of growth. doi
  33. (1985). Resource limitation in plants –an economic analogy. doi
  34. (1985). Response of potatoes to N fertilizer: quantitative relations for components of growth. doi
  35. (2006). RNA: protein ratio of the unicellular organism characteristic of phosphorus and nitrogen stoichiometry and of the cellular requirement of ribosomes for protein synthesis.
  36. (2004). Software for reduced major axis regression. http://www.biosdsu.edu/pub/ansy/ram.html. 12 Bollons HM, Barraclough PB.
  37. (1975). Soil Taxonomy. A basic system for making and interpreting soil surveys. doi
  38. (2004). Terrestrial plants require nutrients in similar proportions. doi
  39. (2004). The C:N:P stoichiometry of autotrophs – theory and observations doi
  40. (1990). The effect of level of nutrition upon mineral content and removal in grasses and wheat. doi
  41. (2006). The N:P stoichiometry of cereal, grain legume and oilseed crops. doi
  42. (1987). The nitrogen content of plants and the self-thinning rule of plant ecology: a test of the core skin hypothesis.

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