Efeito da remoção de sombra e da aplicação de fertilizantes sobre a produção do cacaueiro na Bahia: proceeding
In an experiment started in 1964 and replicated in twenty-one farms of the cacao region of Bahia, the following treatments were used in a 2 x 2 factorial design: control (shade, no fetilizer), deshading with fertilizer, deshading without fertilizer and fertilizer under shade. The experimental units comprised 50 plants of about 30 years old. Shade removal combined with fertilizer application increased yield by an average of 39 percent in 1965, 80 percent in 1966 and 146 percent in 1967. Fertilizer application on shaded plots caused only a slight increase in yield, 5.9 per cent, 13.8 percent and 12.0 percent, in 1965, 1966 and 1967 respectively whereas deshading without fertilizer application showed an average increase of 20 percent, 40 percent and 30 percent during the corresponding years. The actual yield of the control plots during this period was 1,224 kg/ha in 1965, 1,049 kg/ha in 1966 and 822 kg/ha in 1967. This is considered very high in relation to the regional average (about 450 kg/ha), a fact that is attributed to improved cultural practices (mainly, pest and disease control). In 1968, there was an overal decline in yield due to excessive rainfall which tended to mask the results obtained during this period. Even so, the cacao production of the no-shade with fertilizer treatment reached 1,400 kg/ha, or an increase of more than 100 percent over the control (620 kg/ha). The incidence of black pod caused by Phytophthora palmivora, Butl. was greater in the shaded plot than in the unshaded ones, and the number of diseased pods was greater in the fertilized areas. Considerations about responses to fertilization in each soil unit and residual effects from fertilizer application are also made
| Main Authors: | , , , , |
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| Format: | biblioteca |
| Language: | por |
| Published: |
Tafo (Ghana),
1971
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| Subjects: | THEOBROMA CACAO, SOMBRA, PHYTOPHTHORA PALMIVORA, RENDIMIENTO, ABONOS, BAHIA, BRASIL, |
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| Summary: | In an experiment started in 1964 and replicated in twenty-one farms of the cacao region of Bahia, the following treatments were used in a 2 x 2 factorial design: control (shade, no fetilizer), deshading with fertilizer, deshading without fertilizer and fertilizer under shade. The experimental units comprised 50 plants of about 30 years old. Shade removal combined with fertilizer application increased yield by an average of 39 percent in 1965, 80 percent in 1966 and 146 percent in 1967. Fertilizer application on shaded plots caused only a slight increase in yield, 5.9 per cent, 13.8 percent and 12.0 percent, in 1965, 1966 and 1967 respectively whereas deshading without fertilizer application showed an average increase of 20 percent, 40 percent and 30 percent during the corresponding years. The actual yield of the control plots during this period was 1,224 kg/ha in 1965, 1,049 kg/ha in 1966 and 822 kg/ha in 1967. This is considered very high in relation to the regional average (about 450 kg/ha), a fact that is attributed to improved cultural practices (mainly, pest and disease control). In 1968, there was an overal decline in yield due to excessive rainfall which tended to mask the results obtained during this period. Even so, the cacao production of the no-shade with fertilizer treatment reached 1,400 kg/ha, or an increase of more than 100 percent over the control (620 kg/ha). The incidence of black pod caused by Phytophthora palmivora, Butl. was greater in the shaded plot than in the unshaded ones, and the number of diseased pods was greater in the fertilized areas. Considerations about responses to fertilization in each soil unit and residual effects from fertilizer application are also made |
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