Elvis Márcio de Castro Lima

Crescimento e produtividade do girassol cultivado na entressafra com diferentes lâminas de água

In this study the experimental data obtained in the period from March to July of 2004 in the Federal University of Lavras (UFLA) were used, with the objective of evaluating the productivity of grains and of oil and other agronomic characteristics of two sunflower genotypes (Helianthus annuus L.) (H250 and H251), irrigated in the late summer growth period. The experiment was carried out with four treatments of drip irrigation water depths of 0 (L0), 75 (L1), 100 (L2) and 130% (L3) of the evapotranspiration estimated for the crop, corresponding, respectively, to the water depths of 117.20, 350.84, 428.70 and 522.14 mm. The productivity of grains and of oil, the height of sunflower plants and the capitulum diameter increased with water depth. The used cultivars presented differences of oil productivity, weight of 1000 achenes and plants height. There was an technical efficiency in production, even without irrigation, with average productivity of 1924.27 kg ha-1 and, in irrigated condition, there was increase of this productivity reaching the 2863.12 kg ha-1 for water depth of 522.14 mm (130% ETc) applied in the crop cycle. The analyzed genotypes can be used during the summer cycle, in Lavras, as an option in the crop rotation.

Rendimento da pimenta cayenne em função de diferentes tensões de água no solo

This study aimed to evaluate the effect of different soil water tensions at different phenological stages (vegetative and reproductive) on Cayenne pepper cultivated in greenhouse and with drip irrigation. A completely randomized design was used, using four soil water tensions (20, 40, 60 e 120 kPa) as treatments with four replications, in two experiments (1 e 2), related to the phenological stages (vegetative and reproductive), respectively. The higher values of fruits mean weight per plant were obtained with 20 kPa soil water tension, being 1,936.83 and 2,091.59 g plant-1 and the yield coefficients obtained were 0.81 and 1.01, for vegetative and reproductive stages, respectively. It was concluded that the crop yield presented inversely proportional behavior to the soil water tension, and the 20 kPa tension showed most appropriate to promote the irrigation on the studied stages. The yield coefficients identified the reproductive stage as the most sensitive to the water stress.