Nutrient deficiency in soil and plant system can be stressed the optimum growth of plants. Manganese is a potential environmental stressor in case of 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 Mn 2+ 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 to 0.0700 g kg-1; of tobacco (Nicotiana tabacum L.) 0.0237 to 0.0337 g kg-1; and of triticale (x Triticosecale W.) 0.0103 to 0.0327 g NH4- acetate+EDTA extractable soil Mn2+ kg -1; and were grown for 73 d.; 50 d.; and 191 d. The minimum Mn 2+ concentration required in soil nutrient contents was 0.0425 g kg-1 for sunflower; 0.0243 g kg-1 for tobacco; and 0.0103 g kg-1 for triticale. Sunflower, tobacco and triticale achieved optimum growth 0.048 to 0.065 g Mn2+ kg-1; 0.0249 to 0.0321 g Mn2+ kg-1 and 0.0287 to 0.0296 g Mn2+ kg-1. Critical shoot Mn2+ concentration at early stages of growth was 0.0536 g kg-1 in sunflower; 0.458 g kg-1 in tobacco, and 0.1938 g kg-1 in triticale. Our results demonstrate that the tolerance to low external Mn2+ (triticale <0.0302 g kg -1; sunflower: <0.0562 g kg-1; tobacco: <0.0693 g kg-1) and the critical tissue Mn2+ levels for deficiency varied significantly among crop species tested.
ASJC Scopus subject areas
- Agronomy and Crop Science