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Imbituba, Brazil

Barros M.M.,UFRR | Araujo W.F.,DSEA UFRR | Neves L.T.B.C.,DFT UFRR | de Campos A.J.,UEG UnUCET | Tosin J.M.,Brazilian National Council for Scientific and Technological Development
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

The aim of this study was to evaluate the effect of different rates of nitrogen on production and quality of watermelon 'Crimson Sweet'. This research was conducted in the experimental area of the Federal University of Roraima, Boa Vista, from January to April 2010. The experimental design was in randomized blocks with 4 replications. The treatments consisted of 5 levels of nitrogen (50, 100, 150, 200 and 250 kg ha-1 N) applied as urea in a conventional manner. The results showed that the maximum commercial production was 40,428 kg ha-1 with 144.76 kg ha-1 N. Regarding the fruit quality, the pH was not affected by treatments, showing mean value of 5.34. The length/diameter ratio and bark thickness also were not influenced by the treatments, while the firmness, content of soluble solids (SS), titratable acidity (TA), content of sugars (reducing, non reducing and total), the ascorbic acid content and the ratio SS/TA were not influenced by N levels. Source

Lima M.L.,UEG UnUCET | Lima M.L.,Federal University of Goais | Rodrigues Cardoso F.,UEG UnUCET | Rodrigues Cardoso F.,Federal University of Goais | And 4 more authors.
Revista Caatinga | Year: 2013

Elevated productivity of castor and common bean in intercropping is obtained with the use of quality seeds, where boron plays an important role in plant nutrition. The objective of the this study was to evaluate the physiological quality of seeds of the common bean and castor grown in intercropping systems, subject to different sources and levels of boron. A completely randomized design was used in a 2 x 5 + 2 factorial scheme with four replications. Treatments consisted of two sources of boron (borax = 11% B and boric acid = 17% B), combined with five boron doses (0.0, 0.5, 1.0, 2.0 and 4.0 kg ha-1 of B in the soil) in intercropping of the common bean with castor, plus additional treatments of common bean and castor in monoculture. It was concluded that boric acid permitted for acquisition of common bean seeds with the highest germination percentage when intercropped with castor. Use of the dose of 1.5 kg ha-1 of boron in the soil resulted in acquisition of seeds of the common bean with vigor of 79% when intercropped with castor, regardless of the boron source. Employing 2.3 kg ha-1 of boron, with the source being either boric acid or borax, influenced the vigor of castor seeds produced when intercropped with the common bean. The addition of boron by soil fertilization, independent of the source used, did not affect the physiological quality of common bean seeds or castor seeds produced in monoculture. Source

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