Performance of lowland rice seeds coated with dolomitic limestone and aluminum silicate

Abstract

-The objective of this study was to evaluate the performance of seeds of two cultivars of lowland rice (Oryza sativa L.), coated with dolomitic limestone and aluminum silicate. It was used a completely randomized experimental design, with the treatments arranged in a 4 X 2 factorial scheme [4 treatments: dolomitic limestone; dolomitic limestone + aluminum silicate; aluminum silicate, at the dosages of 50 g/100 kg of seeds; and control (without the products) X 2 cultivars: IRGA424 and IRGA 422 CL], totaling eight treatments with four replications each. The variables analyzed were: fresh and dry weights of aerial biomass; plant height; leaf area at 10, 20, and 30 days after emergence (DAE). The physiological quality of seeds was also assessed using tests of: seed emergence; first count of germination; emergence speed index; and field emergence. It was concluded that the coating of rice seeds with dolomitic limestone and aluminum silicate does not affect seed germination and field seedling emergence. Aluminum silicate used via seed coating on cultivar IRGA 424 promoted greater leaf area, after 20 DAE. The dolomitic limestone and the aluminum silicate used via seed coating generated plants with larger dry biomass, after 20 DAE, for the cultivar IRGA 422 CL.

The Influence of Seed Coating on the Vigor and Early Seedling Growth of Barley

“…At 10 days after emergence, the effects on the seedling leaf area of treatments T2, T4, T7, T8, T10, T11, T13 and T14 do not differ; however, all of these effects on leaf area were higher than the value found for the control treatment. Tavares et al (2012) found that treatments of the rice cultivar IRGA 422 CL with dolomitic limestone and aluminum silicate, either alone or in combination, showed significantly greater values of leaf area than the control treatment. In the current study, only treatments T5 and T13 showed significantly greater values of leaf area than the other treatments at 20 days after emergence.…”

“…According to Tavares et al (2012), the coating of lowland rice seed with dolomitic limestone and aluminum silicate did not negatively affect the physiological quality of the seed. In contrast, the treatments produced increments in the initial growth of seedlings relative to the control treatment.…”

“…For this reason, the treatment of seed with fungicide is important because it can guarantee adequate populations of plants if the weather and soil conditions are unfavorable. In addition, silicon is an important amendment because it positively influences plant growth and development (Tavares et al, 2012). Tavares et al (2012) observed that a coating containing a silicon source did not affect either the germination of the coated rice seed or the emergence of seedlings from the coated seed in the field; these same authors also observed that a coating of aluminum silicate applied to rice seed promoted a greater leaf area on the plants at 20 days after emergence.…”

“…In addition, silicon is an important amendment because it positively influences plant growth and development (Tavares et al, 2012). Tavares et al (2012) observed that a coating containing a silicon source did not affect either the germination of the coated rice seed or the emergence of seedlings from the coated seed in the field; these same authors also observed that a coating of aluminum silicate applied to rice seed promoted a greater leaf area on the plants at 20 days after emergence. In addition, their study showed that dolomitic limestone and aluminum silicate, applied in a seed coating either alone or in combination, produced plants with a higher dry biomass as early as 20 days after emergence.…”

“…To guarantee that all seeds are coated with an adequate quantity of the chemical product and thereby maximize the potential benefit from the seed treatment, efficient application is essential (Levien et al, 2008). Several previous studies have reported satisfactory effects of seed coating on seed germination, seedling growth, root and shoot growth, leaf area, dry biomass and increase in yield (Zelonka et al, 2005;Gevrek et al, 2012;Tavares et al, 2012;Tavares et al, 2013). In addition, seed coating improves plantability, reduces the percentage of skips and doubles, reduces the formation of dust from seed and minimizes the leaching of insecticide from treated seed (Avelar et al, 2012).…”