Abstract
The study aimed to analyze the effect of seed treatment with micronutrients on the growth of rainfed rice plants. Treatments consisted in the absence of micronutrient application, single applications or a combination of five micronutrients applied to seeds: compound Zinc + Molybdenum (Mo 2.3, Zn 3.5 % w/v) in a dose of 2 mL kg -1 seed; Copper + Molybdenum + Zinc + Manganese (6.7 Cu, 3.2 Mo, 15 Zn; 9.4% Mn w/v) at a dose of 3 mL kg -1 seed; Zinc (100% Zn p/v) at a dose of 2 mL kg -1 seed, Manganese (50% Mn w/v) at a dose of 2ml kg -1 seed, Boron (3% B w/v) at a dose of 3 mL kg -1 . Plants were collected at, three, seven and eleven days after emergence with readings of leaf area and estimates for dry weight of shoots and roots. From these data calculations were derived for the total plant dry mass, shoot/root ratio, ratio of leaf area to leaf mass and the specific leaf area. The compound mixture of Cu + Mo + Zn + Mn provided the highest seedling dry matter accumulation and highest leaf area, while single zinc applications stimulated the accumulation of root dry mass. Seed treatment with micronutrients provides better performance for the initial growth in rainfed rice plants.
Highlights
Rice (Oryza sativa L.) is a major agricultural crop for the Brazilian agriculture scenario, due to its high productivity and cultivated area
Treatments consisted in the absence of micronutrient application, single applications or a combination of five micronutrients applied to seeds: compound Zinc + Molybdenum (Mo 2.3, Zn 3.5 % w/v) in a dose of 2 mL kg-1 seed; Copper + Molybdenum + Zinc + Manganese (6.7 Cu, 3.2 Mo, 15 Zn; 9.4% Mn w/v) at a dose of 3 mL kg-1 seed; Zinc (100% Zn p/v) at a dose of 2 mL kg-1 seed, Manganese (50% Mn w/v) at a dose of 2ml kg-1 seed, Boron (3% B w/v) at a dose of 3 mL kg-1
Seedlings from seeds treated to Zinc showed, on the seventh days after emergence (DAE), a lower shoot dry matter allocation compared to the product comprising Cu + Mo + Zn + Mn
Summary
Rice (Oryza sativa L.) is a major agricultural crop for the Brazilian agriculture scenario, due to its high productivity and cultivated area. In the 2012/2013 cropping season the national production of this crop reached 11.8 million tons, with an average yield of 2186 kg ha-1 (CONAB, 2013), officially considered as a lowperformance season, due to the species’ high yield potential. Micronutrients are essential elements for plant development, due to their role on metabolism functions, acting as catalysts of diverse physiological and hormonal processes. They act as cofactors and are constituent part of many enzymes acting during seed germination (DINIZ et al, 2007)
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