Fertilización de masas semilleras de pinos en Cuba
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Abstract
An analysis was made of the fertilizer trial with Pinus caribaea var. caribaea established in October, 1967 on a Guane Clay Loam soil derived from shale and slate, located in Vinales, Pinar del Río Province. It presents an assessment of the effect of the various combinations of the N, P, K fertilizers, with or without organic fertilizer, on height growth, the number of trees with cones and the production of cones per treatment. The utilization of 50 kg of N in the form of urea, and 50 kg of in the form of triple superphosphate without organic fertilizer has given outstan- ding increases in height and cone production. Provisional recommen-- dations are made for the fertilization of seed stands in Cuba on the basis of this assessrnent. It recommends a thinning of the class A seed stands, leaving 400 trees per há and making annual applications per tree of 500 g of urea and 500 g of triple superphosphate on the Guane soils; and 1500 g of 15-20-10 on the Nipe and Savanna soils.
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