Manganese – is a necessary plant nutrient. It is often referred to as an important plant nutrient. Despite its insignificant content in plants, it performs a number of specific functions, without which its normal growth and full development is impossible. It belongs to classic micronutrients. One of the first who studied importance of manganese for plants was French researcher Bertrand, who discovered this element in soles of many plant oxidases in 1897. Manganese content in plants is about 0.001% of dry weight. Manganese is involved in various biochemical processes. Without it, the process of photosynthesis is impossible. It is part of the active centre of oxygen-secreting complex of photosystem. Due to manganese, water is decomposed and oxygen is released during photosynthesis: 2Mn+4+2H2O=2Mn+2+O2+4H+. Positive influence of this element on the productivity of photosynthesis (increase in the quantum yield) was noted. Manganese is involved in maintaining the structure of chloroplasts, in its absence chlorophyll is rapidly destroyed. It is a part of various enzymes or takes part in their work.
This element is involved in nitrogen metabolism (NO3-=NH4+ is part of hydroxylamine reductase), biosynthesis of ascorbic acid (vitamin C), activation of Krebs cycle processes, oxidation of ferrous iron forms and neutralization of their toxicity. It promotes accumulation of carbohydrates and proteins. Another important function of manganese is participation in utilization of phytohormones – auxins (IAA). Its main amount is preserved in leaves and chloroplasts. It is known about the effect of manganese on reutilization of phosphorus. It reduces transpiration and increases water retention ability of tissues. In the plant, this element is present in various oxidation states: Mn+2, Mn+3 и Mn+4.
• Prevention and treatment of microelementosis diseases caused by iron deficiency (chlorosis, etc.)
• High efficiency of iron fertilizing with a maximum degree of absorption
• Increased resistance to various abiotic stresses and effects (heat, drought, nitrogen nutrition imbalance, excess solar radiation, etc.)
• Activation of chlorophyll synthesis and accumulation processes
• Optimization of mineral (potassium) metabolism
• Improved yield quality (cereals, bean crops)
• Optimization of processes of respiration and photosynthesis under stressful conditions
• Reduced nitrate content in crops
• Increased disease resistance