Mauro Cezar Barbosa

Qualidade de sementes de quatro cultivares de soja, colhidas em dois locais no estado do Mato Grosso do Sul

O trabalho foi realizado com objetivo de avaliar a qualidade das sementes de quatro cultivares de soja (BRS 133, BRS 206, BRS 239 e CD 202), colhidas em quatro epocas (Estadio R7 e 7, 14 e 21 dias apos a primeira epoca) e produzidas em dois locais do Estado do Mato Grosso do Sul (Sidrolândia e Dourados), nos anos agricolas de 2004/05 e 2005/06. O delineamento experimental utilizado foi em blocos casualizados com tres repeticoes e tratamentos arranjados no esquema de parcelas subdivididas. As parcelas foram constituidas pelas cultivares de soja e as subparcelas pelas epocas de colheita. A germinacao foi avaliada pelo teste de germinacao; teste de envelhecimento acelerado e o vigor pelo teste de frio sem solo, teste de emergencia das plântulas em substrato de areia e teste de sanidade. Os dados coletados nos diferentes locais foram submetidos a analise de variância conjunta de parcelas subdivididas e, na presenca de interacao significativa, foram realizados os desdobramentos necessarios para os dois anos agricolas, separadamente. No ano agricola 2004/05, as cultivares BRS 239 e CD 202 apresentaram-se com elevada porcentagem de germinacao para a producao de sementes na regiao de Dourados. No ano agricola 2005/06, a cultivar BRS 239 foi a que apresentou melhor germinacao e vigor. A cultivar BRS 239 apresenta menor indice de infeccao de microrganismos em relacao a cultivar BRS 206. Melhor qualidade de sementes e obtida das sementes colhidas aos sete dias apos o estadio R7. Em relacao a qualidade sanitaria das sementes, a medida que se retarda a epoca de colheita, a porcentagem total de microrganismos aumenta linearmente para todas as cultivares.

Teores de óleo, proteínas e produtividade de soja em função da antecipação da semeadura na região oeste do Paraná

Early soybean sowing, especially using early cultivars is a practice that is adopted by many growers from the State of Parana in order to anticipate harvest and to enhance growing corn crop during the fall. Experiments of soybean cultivars competition trials were carried out at COODETEC in the city of Palotina, Parana State, aiming to evaluate the influence of early sowing on the chemical composition of seeds, as well as yield. A randomized block design, comprised by two crop years (2003/2004 and 2004/2005), three early cultivars (CD 202, CD 215 and CD 216); and five sowing times (09/15, 09/30, 10/15, 10/30 and 11/15) was utilized. Also, oil and protein content were also determined. The productivity (kg ha-1) was calculated using the yield of grain in each parcel. All data were submitted to variance analysis of group experiments along with all interactions and necessary adjustments. Results allowed to conclude that early sowing can influence grain yield and seed chemical composition.

Seed quality of soybean produced with bioregulator management

The objective of this study was to evaluate the physiological and sanitary quality of soybean seeds treated with the growth regulator Stimulate®. Seeds of the cultivar BRS 246 RR were planted in October of crop years 2007/2008 and 2008/2009, in a randomized complete block design with four replications. The treatments were set out in a factorial, with a combination of seed treatment and the growth regulator (with and without 0.500 L.100 kg-1 bean) at five product dosages (0, 0.125, 0.250, 0.375 and 0.500 L ha-1) with foliar application at two developmental crop stages (V5 or R3). The application of Stimulate® positively altered seed quality, especially at the V5 stage.

Agronomic performance and yield components of soybean cultivars in two sowing dates in the region of Caiuá Sandstone.

This work was conducted with the aim of assessing the agronomic performance and yield components of soybean (Glycine max (L.) Merrill) cultivars in two sowing dates and three crop seasons in the Caiuá Sandstone region. The evaluated cultivars were BRS 255 RR, CD 202, CD 214 RR, BRS 232, BRS 246 RR, CD 208, BRS 262 and CD 218 in three crop seasons (2005/2006, 2006/2007 and 2007/2008) settled in two sowing dates (10/27 and 11/10). The trials were arranged in randomized block design, with four replications. The agronomic characteristics and yield components assessed were: number of days for maturation, insertion height of the first pod, number of pods per plant, 100 seed weight and grain yield. The first sowing date favored increasing the number of days for maturation of virtually all agricultural cultivars in three crop seasons, compared with the second sowing date. For all the evaluated cultivars 1 Pesquisador Dr. em Produção Vegetal pela Universidade Estadual de Maringá, UEM, Maringá, PR. E-mail: mcezarbarbosa@ yahoo.com.br 2 Profs. Drs. do Depto de Agronomia, UEM, Maringá, PR. E-mail: albraccini@uol.com.br; cascapim@uem.br 3 Prof. Dr. Universidade Federal do Paraná, UFPR, Campus Palotina, PR. E-mail: lpalbrecht@yahoo.com.br 4 Discente do curso de Pós-Graduação em Agronomia, UEM, Maringá, PR. E-mail: guillen.piccinin@hotmail.com 5 Prof. Dr. do Depto de Agronomia, Universidade Estadual de Londrina, UEL, Londrina, PR. E-mail: claudemircca@uel.br * Autor para correspondência ARTIGOS/ARTICLES