Combination of inoculation methods of Azospirilum brasilense with broadcasting of nitrogen fertilizer increases corn yield

Nitrogen (N) is the most limiting nutrient for corn production. Thereby, the goal of the paper was to evaluate inoculation methods of Azospirillum brasilense in order to partially supply N required by the crop. The experiment was carried out in Guarapuava, PR, Brasil, in 2011/2012 growing season. Randomized blocks with factorial 3 inoculation methods (seed treatment, planting furrow and non-inoculated control) x 5 doses of nitrogen (0, 75, 150, 225 and 300kg ha-1) x 8 replications was used as the experimental design. Leaf are index, foliar nitrogen content, total chlorophyll, grains per ear and yield were evaluated. There was significant interaction between inoculation methods and nitrogen fertilization to leaf area index, but not for yield. Inoculation with the diazotrophic bacteria provided yield increase of 702kg ha-1 for inoculation in seeding furrow and 432kg ha-1 for inoculation in seed treatment compared to the control, but both treatments did not differ between each other. Furthermore, total chlorophyll, grains per ear and yield were positively affected, with quadratic response, by the nitrogen fertilization in broadcastin

Exigência de treonina digestível para codornas de corte no período de 15 a 35 dias de idade

The digestible threonine (DThr) requirements for meat quails (Coturnix coturnix sp) during growing phase from 15 to 35 days of age were estimated, using 1,020 quails with 15 days of age, of both sexes, distributed in a completely randomized design, with six levels of digestible threonine-0.93; 1.00; 1.07; 1.14; 1.21 and 1.28% in diet, five replications and 34 quails per experimental unit. There was no effect on performance variables, carcass yield and chemical composition and nitrogen balance with the studied increase in digestible threonine levels. There was a linear increase in threonine intake and feed cost per kilogram of body weight gain with increasing levels of digestible threonine. It was concluded that the best level of threonine evaluated was sufficient to meet the requirements of meat quails, in the period from 15 to 35.Universidade Estadual de Maringá, Maringá, PRUNIOESTE, Marechal Cândido RondonUNESP, Jaboticabal, SPZootecnista autônomoUNESP, Jaboticabal, S

Qualidade de tubérculos de batata da cultivar 'Atlantic' afetada pela adubação fosfatada

To evaluate the influence of phosphorus (P) fertilization on the potato tuber quality of the cultivar ‘Atlantic’ experiments were conducted in soils with medium (36 mg dm-3) and high (70 mg dm-3) P availability. The treatments consisted of five P2 O5 rates (0, 125, 250, 500, and 1,000 kg ha-1). The experiments were conducted in a randomized block design, with four replications. Only in soil with medium P availability, the phosphorus fertilization decreases protein, but increases starch content of the tubers until rate of 595 kg ha-1 P2 O5 . Phosphorus fertilization increases the tuber size and marketable yield, but in a more expressive and until higher rates in soil with medium P concentration, in which the influence of tuber size on marketable yield is higher. In two conditions of P availability, the phosphorus fertilization has greater influence on the tuber size and the production of processed material (dry matter yield of tubers) than on the quality characteristics of tubers that influence in the quality frying.Para avaliar a influência da adubação fosfatada sobre a qualidade dos tubérculos de batata da cultivar ‘Atlantic’ foram conduzidos experimentos em solos com médio (36 mg dm-3) e alto (70 mg dm-3) teor de P disponível. Os tratamentos foram constituídos por cinco doses de P2 O5 (0, 125, 250, 500 e 1.000 kg ha-1). Os experimentos foram conduzidos no delineamento experimental de blocos casualizados, com quatro repetições. Apenas no solo com média disponibilidade de P a adubação fosfatada diminui os teores de proteína, mas aumenta o teor de amido dos tubérculos até a dose de 595 kg ha-1 de P2 O5 . A adubação fosfatada aumenta o tamanho dos tubérculos e a produtividade comercial, porém de forma mais expressiva e até maiores doses em solo com médio teor de P, em que a influência do tamanho do tubérculo sobre a produtividade comercial é maior. Nas duas condições de disponibilidade inicial de P, a adubação fosfatada tem maior influência sobre o tamanho dos tubérculos e a produção de material processado (produtividade de matéria seca de tubérculos), do que sobre as características de qualidade dos tubérculos, que podem influenciar na qualidade da fritura.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Universidade Estadual Paulista, Centro de Raízes e Amidos Tropicais, Faculdade de Ciências Agronômicas de BotucatuUniversidade Estadual Paulista, Departamento de Produção e Melhoramento Vegetal, Faculdade de Ciências Agronômicas de BotucatuUniversidade Estadual Paulista, Departamento de Horticultura, Faculdade de Ciências Agronômicas de BotucatuFAPESP: 2010/04987-