Comparing Manganese Sources for Spring Wheat Grown on Alkaline Soils

Abstract

The effectiveness of manganese (Mn) sulfate (28% Mn) and manganese oxide (77.5% Mn) as Mn fertilizers for spring wheat (Triticum aestivum L. cv. Brookton) was compared in a glasshouse experiment using two alkaline soils from south-western Australia. Yield of 56-day-old shoots and Mn content (Mn concentration multiplied by yield) of the shoots was used to compare effectiveness of the sources. Both sources were applied as fine powders at equivalent amounts of Mn and were mixed throughout both soils. For both soils, relative to the Mn sulfate (MnSO 4 ), the Mn oxide (MnO) was about 40% as effective for producing shoot dry matter ORDER REPRINTS and about half as effective at increasing the Mn content of shoot dry matter. Critical concentration (mg/kg) for producing 90% of maximum yield was about 11 for youngest emerged blades and 17 for whole shoots.

Manganese and Oxidative Damage in Cucumber

“…Lack of manganese available to plants is a major factor limiting crop production since it plays an important role in maintaining yield quantity and quality (Brennan and Bolland, 2004;Kochian, 2000). Manganese is essential for its oxidation-reduction function in splitting the water molecule on the oxidant side of photosystem II (Marschner, 1995), and its deficiency results in reduced plant growth and metabolism.…”

Cycling of Micronutrients in Terrestrial Ecosystems

“…rice (Dhaliwal and Chahal 1996;Purakayastha and Chhonkar 2001;Savithri et al 1999a;Swarup 1983), wheat (Triticum aestivum) (Dhaliwal and Chahal 1996;Gupta 1986), a range of pasture species (Gupta 1986), etc. Manganese sulphate (28% Mn) is at least 2-fold more effective than Mn oxide (78% Mn) in supplying Mn to wheat grown on alkaline soils (Brennan and Bolland 2004c).…”

“…In contrast to other inorganic micronutrient fertilisers such as Zn (Lawrence et al 2001;Loss et al 2003), Cu (Brennan and Bolland 2004a) and Mn (Brennan and Bolland 2004c), soil application of inorganic Fe fertilisers (e.g. Fe-sulphate) to Fe-deficient soils is usually ineffective because of quick conversion of Fe into the plant-unavailable Fe 3+ form.…”