O adequado fornecimento de nitrogênio é um dos principais fatores de manejo que afetam o rendimento e a qualidade da produção de hortaliças. Este trabalho teve como objetivo avaliar os efeitos da aplicação de doses e fontes de nitrogênio no desenvolvimento e produtividade de alface, repolho e salsa. Os experimentos foram desenvolvidos na Universidade Estadual de Goiás, Campus Ipameri no período de agosto a novembro de 2014. O delineamento experimental utilizado para cada espécie, foi o de blocos ao acaso, em esquema fatorial 2 x 5, sendo duas fontes de N (ureia convencional e ureia revestida com polímero) e cinco doses de nitrogênio (de acordo exigência de cada espécie), com quatro repetições. As espécies utilizadas foram alface crespa Itapuã Super, repolho chato de quintal e salsa graúda portuguesa. As doses de N foram parceladas em três aplicações iguais, em cobertura, sendo que para a cultura da alface foram aplicados 0, 60, 120, 180 e 240 kg ha-1 de N; para o repolho 0, 75, 150, 225 e 300 kg ha-1 de N e para a salsa 0, 40, 80, 120 e 160 kg ha-1 de N. As fontes e doses de nitrogênio não influenciaram nas características produtivas da cultura da alface, repolho e salva.

The high global food demand has led to crop management practices such as the use of micronutrients to increase soybean productivity. The aim of the present study was to evaluate the effect of boron fertilisation applied to two varieties of soybeans at different doses and different phenological stages on yield components, productivity and physiological quality of seeds. Two different soybean varieties were tested, one conventional (variety BRS 7980) and one transgenic (variety M 7739 IPRO), in two field experiments performed in parallel during the 2014/2015. A randomised block experimental design was used in both experiments, with a 3 x 5 factorial scheme, with four replicates per treatment. The tested factors were three phenological stages (V6, V9 and R1) and five boron doses (0, 1, 2, 3 and 4 B kg ha -1 ). The following parameters were analysed: leaf boron concentration, chlorophyll concentration, yield components and productivity. Boron fertilisation at different phenological stages had no effect on most agronomic traits, but it did increase productivity in both varieties, independent of the phenological stage of application. The boron dose indicated for maximum production for both varieties is 3.51 kg B ha -1 .

Vegetable development and productivity are influenced by several factors, including the nutrient amounts available. Providing adequate nitrogen favours vegetative growth and promotes increased productivity, in addition to providing greater succulence and improving leaf quality. This work evaluated the effect of nitrogen doses and sources on arugula culture development and productivity. The experiment was conducted on the experimental farm at the State University of Goiás, Ipameri campus, in the municipality of Ipameri, Goiás state (GO). The experiment used a 2 × 5 factorial randomized complete block design, with two sources (normal urea and coated urea), five nitrogen doses (0, 60, 120, 180 and 240 kg ha-1 of N) and four replicates. Plant height, stem diameter, leaf number, fresh shoot matter, dry shoot matter and productivity were evaluated. The results obtained here suggest that nitrogen sources do not influence arugula culture development, but nitrogen doses influence the arugula culture’s productive characteristics.

Objetivou-se avaliar os efeitos de fontes e doses de fertilizantes fosfatados sobre o desenvolvimento e a produtividade de hortaliças produtoras de raízes tuberosas. Foram realizados três experimentos distintos, na Universidade Estadual de Goiás - UEG, Câmpus Ipameri-GO, sendo estudado apenas uma espécie em cada um deles. O delineamento utilizado, para cada experimento, foi o de blocos ao acaso, em esquema fatorial 2 x 5, sendo utilizado cinco doses de fósforo (P) e duas fontes de P com quatro repetições. As espécies estudadas foram: cenoura, beterraba e rabanete, as fontes de P utilizadas foram o Superfosfato simples e o Superfosfato triplo. Foram avaliados a altura de planta; diâmetro e comprimento de raiz; número de folhas; teor de P foliar e de raízes; massa fresca e seca de parte aérea; massa fresca e seca de raiz; produtividade comercial, não comercial e total. A aplicação de fontes e doses de fósforo não influenciaram nos atributos morfológicos e na produtividade da cultura da cenoura e rabanete. Para a cultura da beterraba as fontes de fósforo não influenciaram em nenhuma variável e as doses de fósforo incrementou os atributos morfológicos e produtividade.

High physiological quality soybean seeds are essential for a successful production, because they promote optimal plant density in the field. The objective of this work was to evaluate the effect of boron doses applied at different phenological stages of two soybean varieties on the physiological quality of the seeds. Two field experiments were carried out, one with each variety of soybean, conventional and transgenic. Five doses for boron were applied to the soil as boric acid (17%): 0, 1.0, 2.0, 3.0 and 4.0 kg ha-1, at three phenological stages (V6, V9 e R1). In R8 stage the seeds are harvested and then tested for physiological quality, through the tests of Germination, germination first count, germination speed index, accelerated aging and electrical conductivity. For the conventional variety, the boron doses promoted a quadratic effect on variables when the boron was applied near the reproductive stages. For the transgenic variety, the first-degree polynomial model presented the best fit, meaning that the higher the boron dose the better the physiological quality. The optimal boron application stage for producing high vigor seeds was R1 for both varieties. Four (4.0) kg ha-1 of boric acid is recommended for both varieties to produce high quality seeds.