Efeito da exclusao dos insetos polinizadores na producao do café bourbon
The diploid species of Coffea so far investigated, are self sterile, while tetraploid C. arabica, besides being self-fertile, is an almost completely autogamous species. Natural crossing in this species is promoted either by wind or by insects while gravity probably only plays a limited role. The trial here discussed was established to study the effect of certain native and also of the European honey bee in the promotion of the pollination in C. arabica var. bourbon, and also to test their influence on the yield of coffee. As it was difficult to specifically determine the effects of only this group of insects, the data represent the total effect on coffee yield and seed characteristics, of the exclusion of all pollinating insects. A group of 135 coffee "hills", each with four seedlings, and planted in 15 rows of 9 "hills" each, was used for this purpose. A row consisted of two plots of three "hills" each, besides the borders. One "hill" in each plot was always covered with muslin cloth as shown in figure 1. The trial comprised 26 replications. About 20 meters away from the trial, 15 beehives were established, basically of the following species: Nannotrigona (Scaptotrigona) sp., Tetragona (Tetragonisca) jaty, Melipona quadrijasciata anthidioides, Plebeia sp. and Nannotrigona (Na.) testaceicornis. In the course of the experiment, the species Melipona scutellaris and Cephalotrigona capitata were added. There was an apiary of honey bees (A. mellifera) at about 700 meters from the experiment. The muslin protections to exclude insects were placed one day before the opening of the flowers and removed, some 10 to 15 days later, when all flowers had dried corollas. These treatments were repeated every year from 1951 to 1956, in order to collect information on the yield of each of the "hills" and also on the seed types produced and their size
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| Format: | biblioteca |
| Published: |
1959
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| Subjects: | COFFEA ARABICA, BOURBON, RENDIMIENTO, AUTOESTERILIDAD, AUTOFECUNDACION, ABEJA MELIFERA, APIS MELLIFERA, PLEBEIA, NANNOTRIGONA, TETRAGONA JATY, MELIPONA QUADRISFASCIATA, INSECTOS UTILES, POLINIZACION, |
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