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The critical nitrogen dilution curve CNDC can be used as a diagnostic tool to assess crop N nutritionduring the growing season. Potato cultivars have different biomass production and accumulationof N and consequently different growth patterns. These differences among cultivarsmay result in different CNDC. The aims were a to determine the CNDC for different potato cultivars;b to compare these curves with reference curves; and c to assess the possibility of usingthe CNDC to estimate the N nutritional status of the crop. The biomass production and N concentrationof shoots and tubers of potato cultivars Innovator, Gem Russet, Umatilla Russet, BannockRusset and Markies Russet were measured. The harvest index HI and N harvest index NHIwere determined. The coefficient a of the CNDC was similar among cultivars, while the coefficientsb for Innovator and Gem Russet -0.42 and -0.36, respectively were smaller than thosefor the other cultivars average -0.25. HI and NHI were greater in Innovator, smaller in MarkiesRusset, and intermediated in the other three cultivars. The coefficients b of the CNDC were correlatedwith HI and NHI HI, r = -0.62, p < 0.0001 and -0.53, p < 0.0001; NHI, r = -0.60, p <0.0001 and -0.61, p < 0.0001 for 2004-5 and 2005-6, respectively. The relationship betweenrelative tuber yield RY and N nutrition index NNI was fit by a quadratic-plateau function. Atsimilar situations of N deficiency, Innovator had lower yield and greater response to N rate thanthe other potato cultivars. The differences in HI and NHI among cultivars may explain the differencesin the coefficient b of the CNDC. The NNI identified the status of N adequately in potatocultivars.

KEYWORDS

Harvest Index, N Harvest Index, Coefficient of Dilution, Processing Potato

Cite this paper

Giletto, C. and Echeverría, H. 2015 Critical Nitrogen Dilution Curve in Processing Potato Cultivars. American Journal of Plant Sciences, 6, 3144-3156. doi: 10.4236-ajps.2015.619306.





Author: Claudia Marcela Giletto*, Hernán Eduardo Echeverría

Source: http://www.scirp.org/



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