Lourenco K.S.,Santa Catarina State University |
Correa J.C.,Aves BR 153 |
Ernani P.R.,Brazilian National Council for Scientific and Technological Development |
Lopes L.S.,Aves BR 153 |
Nicoloso R.S.,Santa Catarina State University
Revista Brasileira de Ciencia do Solo | Year: 2013
Common bean is traditionally grown on small farms in Brazil, where animal wastes are often used as soil fertilizer. Since this is a short-cycle species, nutrients must be available soon after seed germination, which is not always the case when supplied in the form of organic fertilizers. This study was carried out to evaluate the efficiency of different poultry litters in comparison with mineral fertilizers to increase dry matter yield and nutrient release to beans. The experiment was conducted in 2010, in a greenhouse, with Oxisol samples containing16 g kg-1 of organic matter, 1.9 and 84 mg dm-3 of P and K, respectively, and with a pH of 6.0. A randomized complete block design was used with 10 treatments and five replications. The experimental units consisted of 14 dm3 of soil (dry base) in plastic pots, where five seedlings (cultivar BRS Requinte) were grown for 60 days. Treatments consisted of five poultry litters on the materials maize straw, sugar cane bagasse, native grass straw, sand and pine needles, respectively, and four mineral nutrient combinations (NPK, NP, PK, and NK), plus one control without any fertilizer. Mineral fertilizers containing P induced higher dry matter yield of shoot and roots of bean than the poultry litters, due to the release of higher amounts of available N and P. Of the animal wastes, the poultry litter with sand substrate was the most efficient to promote bean yield. Plants fertilized with poultry litters accumulated, on average 58.6 and 59.0 %, respectively, of the N and P accumulated in plants treated with mineral fertilizers containing N and P. The N and K recovery rate by plants was always higher for nutrients applied in mineral than organic forms. Poultry litters may be used as soil fertilizer of common beans provided they are supplemented with mineral fertilizers containing N and P.
Henn J.D.,University Comunitaria Regional Of Chapeco Unochapeco |
Bertol T.M.,Aves. BR 153 |
de Moura N.F.,University Comunitaria Regional Of Chapeco Unochapeco |
Coldebella A.,Aves. BR 153 |
And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2010
This study aimed to investigate the effect of dietary supplementation of oregano essential oil on the performance and on the occurrence of diarrhea in weanling pigs, as well as its antioxidant and antimicrobial activity evaluated in vitro. It was compared four treatments (diets): negative control; positive control, 0.5% ZnO (preventive diarrhea) + 0.05% zinc acitracin (growth promoter); or 0.003% of essential oil of oregano, combined or not with preventive of diarrhea. Weight gain, feed intake and feed conversion were evaluated from 27 (weaning) to 62 days of age of the animals, and the occurrence of diarrhea was evaluated on the first 14 days of the experiment. The positive control diet and the oregano oil + zinc oxide diet were the ones that provided the best zootechnical performance. The number of piglets with diarrhea, as well as the duration of diarrhea, were lower in animals fed positive control and oregano oil + zinc oxide diets. Oregano oil had in vitro bacteriostatic action on all the tested microorganisms and bactericidal action against four bacteria. The in vitro antioxidant activity of oregano oil was 98.88% through linoleic acid/β-carotene system methodology, and 174.17 mg/mL by the DPPH method, expressed as CE50. Oregano oil shows potent antioxidant effect and a strong antimicrobial activity, however, it does not improve the zootechnical performance neither it is efficient in preventing diarrhea in weanling pigs. © 2010 Sociedade Brasileira de Zootecnia.