TITLE:
Critical Nitrogen Dilution Curve in Processing Potato Cultivars
AUTHORS:
Claudia Marcela Giletto, Hernán Eduardo Echeverría
KEYWORDS:
Harvest Index, N Harvest Index, Coefficient of Dilution, Processing Potato
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.6 No.19,
December
11,
2015
ABSTRACT: The critical nitrogen dilution curve (CNDC) can be used as a diagnostic tool to assess crop N nutrition
during the growing season. Potato cultivars have different biomass production and accumulation
of N and consequently different growth patterns. These differences among cultivars
may 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 using
the CNDC to estimate the N nutritional status of the crop. The biomass production and N concentration
of shoots and tubers of potato cultivars Innovator, Gem Russet, Umatilla Russet, Bannock
Russet and Markies Russet were measured. The harvest index (HI) and N harvest index (NHI)
were determined. The coefficient a of the CNDC was similar among cultivars, while the coefficients
b for Innovator and Gem Russet (-0.42 and -0.36, respectively) were smaller than those
for the other cultivars (average -0.25). HI and NHI were greater in Innovator, smaller in Markies
Russet, and intermediated in the other three cultivars. The coefficients b of the CNDC were correlated
with HI and NHI (HI, r = -0.62, p