http://lattes.cnpq.br/4070582933073155; SILVA, Paulo Cesar Moura.
Résumé:
The objective of the present work was to study the effect of irrigation and water salinity
leveis on the development, production, fruit quality of Anão Verde coconut and on the
soil salinity. The study was conducted at the EMPARN Experimental Station located in
Parnamirim - RN during the period of June 2002 to October 2003. The treatments
studied were four irrigation leveis based on the evaporation of water measured by a
Class A evapotranspiration pan (30, 60, 90, 120 % of the evaporation pan) and four
water salinity leveis interms of electrical conductivity (0.1, 5.0, 10.0, and 15.0 dS.m"').
The study was conducted in a completely randomized experimental design in split-plots.
Analyses of variance, regression analyses and response surfaces were performed when
necessary. The plant variables measured were: number of flowers, number of fruits,
fiowers/fruit realationship, phytomass and quality of the production (volume of coconut
water, fruit weight, °Brix, electrical condutivity and pH of the water, pulp weight,
length and diameter of the fruit). Leaf samples were collected at the initial and final
stages of the experiment to determine the N, P, K, Ca, Mg, Cl and Na content in the
leaf. Soil samples were collected only at the end of the experiment to determine the
electrical conductivity of the saturation extract. The increase of the irrigation levei
increased the coconut production, the brix and the phytomass. It did not influence the
weight of the fruit, the pulp weight and the volume or water. The increase of water
salinity leveis increased the number of féminine flowers, the flower/fruit relationships,
and the brix; decreased the production, the weight of the fruit and the volume of water.
It did not influence the pulp weight. It was also observed that the fruit become less
rounded with the increase of water salinity and that the salinity effects decreased with
the irrigation leveis. The nutrient leveis in the leaf were always above the criticai leveis,
with the exception of the K which remained below at the end of the experiment. The
electrical conductivity of the soil at the end of the experiment, at the different soil
depths, were very low.