Services on Demand
Journal
Article
Indicators
Cited by SciELO
Access statistics
Related links
Cited by Google
Similars in SciELO
Similars in Google
Share
Revista Colombiana de Ciencias Hortícolas
Print version ISSN 2011-2173
Abstract
GOMEZ S., MANUEL IVÁN; MAGNITSKIY, STANISLAV and RODRIGUEZ, LUIS ERNESTO. Diagnostics of K + and NO 3 - in sap to determine nutritional status in potato ( Solanum tuberosum L. subsp. andigena ). rev.colomb.cienc.hortic. [online]. 2017, vol.11, n.1, pp.133-142. ISSN 2011-2173. https://doi.org/10.17584/rcch.2017v11i1.6132.
Sap analysis is a nutritional diagnostic tool to provide timely fertilization adjustments in crops. The objective of this study was to determine the reference levels of NO3 - and K+ in sap per phenological stage. The study evaluated the proper use of this nutritional diagnostic tool for N and K in Diacol Capiro and Pastusa Suprema potato on the Bogotá Plateau at 55, 75, 100, 125 and 150 days after sowing (das) in response to balanced fertilizer levels (0; 1,450; 1,900 and 2,375 kg ha-1) on the yield, dry matter and harvest index to determine levels for cultivation and phenology. The highest K+ concentration in sap in the stems occurred at the vegetative stage with 4,800-5,000 mg L-1, decreasing in tuberization with 2,725 mg L-1, without significant differences between cultivars; contrary to the behavior of N-NO3 - in the stems, where the maximum concentration at tuberization was 2,466 mg L-1 Capiro and 2,200 mg L-1 Supreme, with decreased values at physiological maturity. The reference levels were obtained at flowering stage for Capiro by quadratic adjustment of N-NO3 - and K+ in sap with 3,280 mg L-1 and 1,231 mg L-1, respectively, and related with the response to fertilization, yield, dry matter, and leaf area. In contrast for Supreme, the evaluated N, with levels higher than 1,250 mg N-NO3 - L-1 in sap, supposed luxury consumption. Using this diagnostic tool in the field, adjustments can be made to the management of nitrogen and potassium nutrition of these cultivars.
Keywords : sap analysis; nutrient indicators; efficient use of K and N.