Desempenho de sementes de arroz irrigado recobertas com zinco

Abstract

DESEMPENHO DE SEMENTES DE ARROZ IRRIGADO RECOBERTAS COM ZINCO 1resumo -a cultura do arroz constitui um dos principais cereais que apresenta alta resposta à aplicação de zinco, sendo a cultura mais sensível à deficiência deste elemento. O objetivo nesta pesquisa foi avaliar os efeitos do recobrimento Termos para indexação: Oryza sativa L., tratamento de sementes, componentes do rendimento. PerFormanCe oF zInC Coated IrrIgated rICe seedsABSTRACT -The rice cultivation is a major cereal that has a high response to the application of zinc, with culture more sensitive to deficiency of this element. The objective in this study was to evaluate the effects of coatings of different doses of zinc in seeds of rice, on the performance of seeds and the yield components. The work was conducted at the Federal University of Pelotas in the agricultural year of 2006/07. The treatments consisted of applying a mixture of zinc sulphate heptahydrate (22% Zn), with six levels: zero; 0,37; 0,47; 0,57; 0,67 and 0,77 g kg -1 seed. In addition to coating with zinc sulphate, was used for all treatments a mixture of fungicide (3 ml kg -1 ), polymer CF Clear® (200 mg kg -1 ) and dye (4 mL kg -1 ). The experimental design was completely randomized with four replications. Seed quality was evaluated by means of the germination test and tests of force (length of shoot and root, biomass of shoots and roots of seedlings). In a greenhouse were evaluated further the components of yield (number of panicles

Physiological performance of wheat seeds coated with micronutrients

“…The increase in dosage up to 4 mL.kg -1 of seeds caused a linear increase in seed yield for both products ( Figure 1B). These data confirmed those reported by Funguetto et al (2010), who obtained a linear increase in the number of grains per panicle and in the weight of grains per plant with increasing dosages of zinc: a 29% increase in the number of grains per panicle and a 21% increase in the weight of grains per plant at the maximum dosage of 0.77 g Zn.kg -1 of seeds, compared to a zero dosage of Zn.kg -1 of seeds. This result was also observed by , who observed an increase in grain yield after treating soybeans with Acaplus (8.5% Zn + 7% N) at a dosage of 200 mL per 100 kg of seeds and an increase in yield for corn treated with the rooting products, Awaken (16.0% N; 3.53% Zn; 0.15% Mn; 0.15% Fe; 0.15% Cu; 0.02% B and 0.0006% Mo), at a dosage of 160 mL per18 kg of seeds.…”

“…These results are similar to those of Ohse et al (1999), who found that the number of panicles per irrigated rice plant varied according to the dosage of zinc applied to the seeds, with an estimated maximum of 5.94 panicles per plant for the optimum dosage of 0.76 g Zn.Kg -1 of seeds, equivalent to 114.0 g.ha -1 of zinc. However, Funguetto et al (2010) and Orioli Junior et al (2008) did not observe any differences between dosages of Zn for this variable and did not detect any differences in the number of spikelets in wheat seeds treated with zinc.…”

“…These results agree with those of Ohse et al (2000), who concluded that coating seeds with zinc did not affect germination and vigor. Funguetto et al (2010) analyzed coating rice seeds with zinc, fungicide and a polymer and they also did not observe any changes in germination. However, Yagi et al (2006) noted a reduction in the percentage germination of sorghum seeds treated with zinc.…”

“…With the results from the foliar area and dry weight of the aerial parts, the following parameters were determined: crop growth rate -CGR (mg. day ). These calculations were based on the methodology described by Gardner et al (1985), in which: CGR = (DM 2 -DM 1 )/(T 2 -T 1 ); RGR = (ln DM 2 -ln DM 1 )/(T 2 -T 1 ); NAR = (DM 2 -DM 1 )/(T 2 -T 1 ) * (ln FA 2 -ln FA 1 )/(FA 2 -FA 1 ); with: DM: dry material, T: time, FA: foliar area.…”

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

“…Studies on seed coating with dolomitic limestone or aluminum silicate used together, aiming at evaluating initial growth and seed physiological quality, were not found in the literature. However, Funguetto et al (2010) working with rice seeds coated with zinc, concluded that seed germination is not affected; and vieira and Moreira (2005) In relation to the parameter LA, it was found that seed coating with dolomitic limestone and aluminum silicate did not affect the leaf area of cultivar IRGA 422 CL plants. However, the seed coating with aluminum silicate did cause leaf area increases on plants of cultivar IRGA 424.…”