Fertilization during the establishment of a Eucalyptus camaldulensis plantation in the northern Brazilian Amazon.

Abstract

-Forestry plantations should be regarded as an alternative sustainable land-use system in degraded savannah areas. They contribute to the maintenance of productive processes in degraded soils that are of economic importance for local inhabitants; in addition, in the ecological sense, timber and non-timber products from planted forests reduce the exploitation pressure on native forests. Eucalyptus plantations on degraded savannahs in the northern Brazilian Amazon may help to reduce exploitation pressure on native forests. However, there is no information regarding the nutrients rates that would allow faster eucalyptus growth in that region. A trial was installed in an Yellow Latosol (Oxisol) soil type adopting a one-half-type fractional factorial design with four rates of N, P, and K. Functions were adjusted for the dependent variables height, diameter at breast height (DBH), leaf tissue nutrient content, and soil-chemical attributes. Interaction N versus K was observed on tree height with a maximum of 7.8 m recorded at 200 kg ha -1 of N and 50 kg ha -1 of K. Phosphorus fertilization promoted greater DBH growth with maximum value at 120 kg ha -1 of P; however, the highest gain was obtained at 30 kg ha -1 of P. The NPK rates that maximized Eucalyptus camaldulensis growth were 200, 30, and 50 kg ha -1 , respectively.

Effect of NPK Fertilization on Tachigali vulgaris L. G. Silva & H. C. Lima Plants

“…The treatments followed average doses of fertilizers found in the literature for forest stands such as eucalyptus and black acacia (Costa et al, 2012;Schumacher et al, 2013), which consisted in the use of commercial products, urea, triple super phosphate and potassium chloride as nitrogen-N, phosphorous-P 2 O 5 and potassium-K 2 O respectively, forming the treatments (Table 3). Those were combined according to the fractional factorial arrangement 23 at random, represented by 8 treatments with plots of 4 plants and 4 replications, randomly installed at the planting, totaling 128 plants studied.…”

Nutrição e fertilização de plantações clonais de eucalipto sob diferentes condições edafoclimáticas

“…Estes resultados indicam maior representatividade dos compartimentos tronco, casca e raízes, e consequentemente, maior demanda pelos nutrientes armazenados nas folhas. Os teores de N aos 24 e 36 meses pós-plantio variaram entre 12,2 e 16,4 g kg -1 , abaixo dos valores encontrados em trabalhos realizados com E. grandis (LEITE et al, 2011;FERRAZ, 2013; ROCHA, 2014) e próximos aos valores encontrados em trabalhos realizados com E. urophylla x grandis (COSTA et al, 2012;FREITAG, 2013) e E. globulus ATTIWILL, 1997;MERINO et al, 2003).…”