title: Crop demand of manganese.
abstract: 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 of Mn(2+) deficiency during early stages of growth. The minimum Mn(2+) concentration required in soil nutrient contents was 42.5 mg kg(-1) for sunflower, 24.3 mg kg(-1) for tobacco and 10.2 mg kg(-1) for triticale. Sunflower, tobacco and triticale achieved optimum growth at 48.0-65.0 mg Mn(2+) kg(-1), 24.9-32.1 mg Mn( n+) kg(-1) and 28.7 to 29.6 mg Mn(2+) kg(-1), respectively. Critical shoot Mn(2+) concentration at early stages of growth was 53.6 mg kg(-1) in sunflower, 458.0 mg kg(-1) in tobacco and 193.8 mg kg(-1) in triticale. Our results demonstrate that the tolerance to low external Mn(2+) (triticale: <30.2 mg kg(-1); sunflower: <56.2 mg kg(-1); tobacco: <69.3 mg kg(-1)) and the critical tissue Mn(2+) levels for deficiency varied significantly between crop species tested.
authors.affiliation: Agrochemistry Division, Research Institute for Soil Science and Agricultural Chemistry of the Hungarian Academy of Sciences, PO Box 35, 1525 Budapest, Hungary. marton@rissac.hu
authors.forename: Laszlo
authors.initials: L
authors.lastname: Marton
mesh_terms: D018556:Crops, Agricultural / Q000254:growth & development / Q000378:metabolism; D002523:Edible Grain / Q000254:growth & development / Q000378:metabolism*; D005308:Fertilizers / Q000032:analysis; D006368:Helianthus / Q000254:growth & development / Q000378:metabolism*; D006814:Hungary; D008345:Manganese / Q000172:deficiency / Q000378:metabolism*; D012987:Soil / Q000737:chemistry*; D013054:Spectrophotometry, Atomic; D014026:Nicotiana / Q000254:growth & development / Q000378:metabolism*
chemical_list: D005308:Fertilizers; D012987:Soil; D008345:Manganese