Nitrogenous fertilization of Coffea canephora Pierre var. Robusta related to yield, and some chemical and microbiological indicators of Cambisols in Cuba
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Abstract
2002 in Coffea canephora Pierre var. Robusta plantations on
Cambisols in two regions: La Alcarraza and Tercer Frente,
with the objective of determining N requirements as well as
some soil chemical (% organic matter, pH) and microbiological
(biological breathing) indicators. Growing doses of N
fertilization were evaluated depending on crop stage that anged
between 0 and 200 kg.ha-1 . A randomized complete block design with four replicates was used. For the first year of plantation (1997), a dose of 60 kg N.ha-1 guaranteed appropriate canopy diameter growths, whereas during the second year (1998), N requirements increased and were necessary 72 and 90 kg.ha-1 to reach the top stable canopy diameter of coffee trees in La Alcarraza and Tercer Frente, respectively. A dose of 90 kg.ha-1 guaranteed stable yields since the second harvest, with values of 1.25 to 1.30 t coffee berries.ha-1. From the third harvest, N requirements increased and were necessary 100 kg.ha-1 to achieve yields of 1.30 to 1.36 t coffee berries.ha-1 in Tercer Frente and 1.48 to 2.00 t in La Alcarraza. The recommended N doses for C. canephora for the establishment and production stage did not have any negative effect on the biological breathing, organic matter and soil pH.
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