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Nutrient concentration relationships between the fourth petiole and upper-stem of potato plants

Westermann, D.T. and Bosma, S.M. and Kay, M.A. (1995) Nutrient concentration relationships between the fourth petiole and upper-stem of potato plants. American Potato Journal. 71:817-828.

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Successfully evaluating the nutritional status of a crop during growth
and development is dependent upon sampling an identifiable plant part.
Consistently sampling a petiole of the same maturity in potatoes (Solanum
tuberosum L.) is difficult. We evaluated the nutrient relationships between
the upper-stem and the fourth petiole from Russet Burbank plants in field
studies having N, P, K, Zn or Mn variables. The upper-stem was obtained by
excising the stem below the sixth leaf and removing all leaves and the terminal
meristem. Petole NO3-N, P, K, Zn and Mn concentrations were from
deficient to sufficient. The NO 3-N, P and K concentrations were similar in
the fourth petiole and upper-stem, while the Zn concentration was 40%
higher in the upper-stem. Calcium, Mg and Mn concentrations were lower
in the upper-stem than in the fourth petiole. Copper and S relationships
were not adequately defined. The fourth petiole's NO 3-N, P and K diagnostic
concentrations now used to monitor plant nutrient status can also be
used for upper-stem samples. Zinc diagnostic concentrations should be increased,
while Ca, Mg and Mn concentrations should be adjusted downward
in the upper-tem. Additional data are needed to refine the Ca and Mg
relationships, and to establish relationships for Cu, S and other essential
nutrients. A significant advantage of using the upper-stem is the elimination
of the petiole selection problem when sampling.

Item Type: Article
NWISRL Publication Number: 0863
Subjects: Irrigated crops > Potato
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:54
Last Modified: 23 Nov 2016 18:45
Item ID: 640