Respostas fisiológicas de Elaeis guineenses Jack a doses de calcário em área de ocorrência de amarelecimento fatal.

Abstract

The expansion of the oil palm cultivated area in the already deforested areas of the Amazon is a fact. However, one of the main obstacles to the expansion of palm oil cultivation in the State of Pará is due to Fatal Yellowing (FA), which is a problem of unknown order. The symptomatology begins with the yellowing of the arrow leaf and with evolution its leaves dry up. This work was carried out under field conditions present at Marborges S.A., Moju – PA. Two clones (BRS 2501 and 2801) of oil palm, previously characterized as sensitive to fatal yellowing, were used. A comparative analysis was carried out in the six treatments T1 (control without harrow), T2 (control with harrow), T3, T4, T5 and T6 (2, 4, 6 and 8 tons of dolomitic limestone). The evaluations were carried out on oil palms at the beginning of production, during the period characterized with less rainfall over a year. To this end, analyzes of physiological parameters, gas exchange, water status, pigments, carbohydrates, enzymatic activity, plant height, collar diameter and monitoring of physical and chemical conditions in soils related to the FA problem were performed. It was verified, as a whole, that the results did not present a close relationship between the appearance of FA with the application of limestone, however the treatment with 8 ton/ha showed a better vegetative development.