Advisor(s)
Abstract(s)
A set of fertilizer experiments were conducted during three growing seasons with
the aim of establishing sufficiency ranges and crop nutrient removals for Melissa
officinalis L. Critical nutrient concentrations were determined by the Cate–Nelson
method or by removing 10% of extreme high and low values, respectively if a
positive response to a given nutrient was recorded or not. Sufficiency ranges for
macro, micronutrients, and SPAD-readings were set as: 27.0–40.0 g N kg¡1; 0.8–
2.7 g P kg¡1 (May–August); 1.5–3.8 g P kg¡1 (September–November); 10.0–25.0 g
K kg¡1 (May–August); 18.0–32.0 g K kg¡1 (September–November); 5.0–25.0 g Ca
kg¡1; 3.5–8.5 g Mg kg¡1; 18–125 mg B kg¡1; 5–25 mg Cu kg¡1; 75–500 mg Fe
kg¡1; 20–300 mg Zn kg¡1; 30–250 gMn kg¡1; 30–45 SPAD-units. These results will
allow laboratories to use plant analysis as an important tool in improving the
fertilizer recommendations for this species.
Description
Keywords
Critical concentrations Melissa officinalis Plant analysis SPAD readings Threshold values
Pedagogical Context
Citation
Rodrigues, M. Ângelo; Ferreira, Isabel Q.; Afonso, Sandra; Arrobas, Margarida (2018). Sufficiency ranges for lemon balm and nutrient removals in aboveground phytomass. Journal of Plant Nutrition. ISSN 0190-4167. 41, p. 996-1008