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O experimento foi conduzido em casa de vegetacao do Departamento de Fitotecnia, na Universidade Federal de Santa Maria, com o objetivo de avaliar a eficiencia da aplicacao de zinco nas sementes da cultivar de arroz irrigado BRIRGA 410 e em sete amostras de solo, sobre altura de planta, numero de afilhos e de paniculas, massa fresca e seca da parte aerea e teor de zinco na massa seca da parte aerea das plantas de arroz. O delineamento experimental utilizado foi um bifatorial 4 x 7 em blocos ao acaso, com tres repeticoes. Utilizou-se vaso de latao pintado, revestido com saco plastico, com 3,0 kg de cada solo. Os tratamentos com zinco constaram da aplicacao na semente (100 g ha-1 Zn) tendo como fonte ZnSO4.7H2O (22,73% de Zn), no solo (5,0 kg ha-1 Zn) sendo a fonte Zincodur® (28% de Zn), as duas formas de aplicacao combinadas e a testemunha sem zinco. Os resultados evidenciaram que nao houve diferenca estatistica significativa nos tratamentos com zinco aplicado em tres classes de solo e no tratamento de semente, sobre o crescimento das plantas, com excecao da variavel teor de zinco na massa seca da parte aerea que foi superior para os tratamentos com zinco no solo e na semente + solo. O solo Vacacai (PLANOSOLO HIDROMORFICO Eutrofico arenico), originario de Sao Gabriel (RS), destacou-se dentre os demais nas variaveis de numeros de afilhos, massa fresca e seca da parte aerea e teor de zinco na massa seca da parte aerea, pelo fato de apresentar originariamente teor mais elevado de zinco. Abstract This experiment was conducted in the greenhouse of the Department of Plant Science, at the Federal University of Santa Maria, to evaluate the efficiency of application of zinc on the seeds of irrigated rice cultivar BR- IRGA 410 and on seven soil samples. Plant height, number of tillers, and panicle, fresh and dry shoot and zinc content in dry mass of shoots were evaluated. The experimental design used was a factorial 4 x 7 in randomized blocks with three replications. It was used brass pot which was lined with plastic bag, and filled with 3.0 kg of soil. Zinc treatments were applied in the seed (100 g ha-1 Zn) with the source ZnSO4.7H2O (22.73% Zn), soils (5.0 kg ha-1 Zn) being the source Zincodur® (28% Zn), the two forms of combined application and control without zinc. The results showed no statistically significant difference in treatment with zinc for different soil types, except for the variable zinc content in shoot dry mass was higher for treatments with zinc in soil and seed plus soil. The soil Vacacai (Hapludult Eutrophic Hydromorphic Planosol), originally from Sao Gabriel (RS), stood out among the other variables in tiller number, fresh and dry shoot and zinc content in shoot dry mass, due to the fact that it originally presents higher content of zinc.

Aplicação de zinco em sementes de arroz irrigado e no solo / Application of zinc on rice seeds and on the soil