A B S T R A C TThe major potential of wind power generation in the world and a possibility of electric energy production make it an alternative source to increase the diversity in the world energy matrix. The objective was to characterize a predominant velocity and direction of the wind for generation of wind power in the Submédio São ) of the São Francisco Submiddle. The highest values of wind power are highlighted for the municipalities of Dormentes, Lagoa Grande, Curaçá, Petrolina, Afrânio, Pedro Alexandre, part of the municipality of Santa Filomena, Santa Maria da Boa Vista, Chorrochó, Macururé, Paulo Afonso, and Juazeiro. The municipality of Curaçá, in the State of Bahia, show the most favorable installation of wind generators, instead of larger values and constant wind transmission. Consequently, it has the highest values of wind energy and a dominant frequency in the southeast direction of the winds throughout the day, being able to fix the towers in this geographical orientation. A large part of the Submédio São Francisco is suitable for the installation of wind energy generation centers.
ABSTRACT:Because vegetables have a fast production cycle, they require fertilization in quantities and at ideal times to obtain maximum productivity, and green manure is an alternative practice to the use of mineral fertilizers. This study was conducted to evaluate the effects of different amounts of roostertree [Calotropis procera (Ait.) R. Br.] biomass and its incorporation times in two growing seasons, in the agronomic performance of carrots. The experiment was conducted on an experimental farm at the Universidade Federal Rural de Pernambuco (UFRPE) in the autumn-winter period (March-July 2012) and the spring-summer period (September-December 2012). The experimental design was a randomized block design with three replications. The treatments were arranged in a factorial 4 x 4 design; the first factor consists of four amounts of roostertree biomass (5.4, 8.8, 12.2 and 15.6 t ha -1 on a dry basis), and the second factor consists of four times of incorporation of this manure into the soil (0, 10, 20 and 30 days before sowing the carrots). The carrot cultivar used was Brasília. The following traits were evaluated: plant height, number of leaves per plant, root dry mass, total and commercial yield of roots. The best agronomic performance of carrot cultivar Brasília was found with the amount of roostertree biomass of 15.6 t ha -1 , in the time of incorporation into the soil of 10 days before seeding. The cultivation in the autumn-winter showed higher total and commercial productivities of carrot roots fertilized with roostertree.
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