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Manganese requirement of sunflower (Helianthus annuus L.), tobacco (Nicotiana tabacum L.) and triticale (x Triticosecale W.) at early stage of growth

László, Márton
European journal of agronomy 2008 v.28 no.4 pp. 586-596
manganese, interspecific variation, Triticosecale, Helianthus annuus, plant nutrition, fertilizer rates, developmental stages, nutrient uptake, Nicotiana tabacum, nutrient requirements, soil fertility, triticale, tobacco, Hungary
Manganese deficiency symptoms are more often observed in crops at early stages of growth since Mn²⁺ can be easily mobilized from the surface soil. The objectives of this study were to evaluate some of the popular rotation crops grown in Hungary for tolerance to low external Mn²⁺ levels and to determine the critical tissue concentration for Mn²⁺ deficiency during early stages of growth. Indicator plants of sunflower (Helianthus annuus L.) were grown with NPKCaMg-fertilization induced of 0.0425-0.0700gkg⁻¹; of tobacco (Nicotiana tabacum L.) 0.0237-0.0337gkg⁻¹; of triticale (x Triticosecale W.) 0.0103-0.0327g NH₄-acetate+EDTA extractable soil Mn²⁺ kg⁻¹; and were grown for 73, 50, and 191 days. The minimum Mn²⁺ concentration required in soil nutrient contents was 0.0425gkg⁻¹ for sunflower, 0.0243gkg⁻¹ for tobacco, and 0.0103gkg⁻¹ for triticale. Sunflower, tobacco and triticale achieved optimum growth from 0.048 to 0.065gMn²⁺ kg⁻¹, from 0.0249 to 0.0321gMn²⁺ kg⁻¹, and from 0.0287 to 0.0296gMn²⁺ kg⁻¹, respectively. Critical ABP's dry weight Mn²⁺ concentration at early stages of growth was 0.0536gkg⁻¹ in sunflower, 0.458gkg⁻¹ in tobacco, and 0.1938gkg⁻¹ in triticale. Our results demonstrate that the tolerance to low external Mn²⁺ (triticale <0.0302gkg⁻¹; sunflower <0.0562gkg⁻¹; tobacco <0.0693gkg⁻¹) and the critical tissue Mn²⁺ levels for deficiency varied significantly among crop species tested.