African Mahogany Submitted to Drip Irrigation and Fertilization

Abstract

African mahogany (Khaya ivorensis A. Chev.) is a tree species that has been increasing in Brazilian commercial planting. However, the lack of water and nutrition are great obstacles for crop production. The aim of this study was to evaluate the growth of young mahogany plants submitted to drip irrigation and topdressing. The experimental design was of randomized blocks, with three repetitions in subdivided plots. Treatments consisted of drippers: 1, 2 and 3plt-1; flows: 2, 4 and 8L h-1, and a treatment without irrigation. For topdressing, subplots levels were, as follows: 1) 17.5 and 25.2; 2) 35.1 and 50.1; 3) 52.5 and 75.0; 4) 70.0 and 100.2; and 5) 87.5 and 125.1 g plant-1 N and K2O, respectively, divided into five bimonthly applications, which started in the 4th month after planting. Plant height, diameter at root collar and at breast height (DBH), and stem height were evaluated. Results showed statistically significant differences (P>0.05) between irrigated and non-irrigated plants. Mean plant height ranged (from 2 to 20 months in field) from 0.33 to 3.25 and 2.67m for irrigated and non-irrigated plants, respectively. Mean stem height ranged from 0.23m to 0.87 and 0.71m for irrigated and non-irrigated plants, respectively. Thus, irrigation with 1 dripper per tree and flow of 2L h-1 was able to supply mahogany water requirements in the first two years in field. Trees have not responded to N and K topdressing at the beginning of the cycle.

ESTIMATION OF BIOMASS, CARBON AND CO2 OF Khaya senegalensis (Desr.) A. JUSS

“…A. Juss., is a species of mahogany, which originated in countries on the west coast of the African continent, a region with edaphoclimatic characteristics similar to some regions of Brazil (Júnior et al, 2017).…”

Necessidade de se irrigar a fase inicial de floresta de Mogno-Africado no cerrado

“…O estresse hídrico, quando no início do ciclo de culturas perenes, pode ser mais prejudicial visto que as raízes são rasas, o que dificulta a absorção da água disponível em camadas mais profundas do solo (ALVES JUNIOR et al, 2016). Plantas de mogno-africano irrigada até os dois anos de idade apresentam melhor desempenho que plantas não irrigadas (ALVES JÚNIOR et al, 2017).…”

“…Médias seguidas pela mesma letra minúscula na coluna não diferem estatisticamente pelo teste de Tukey a 5% de probabilidade. Dados da avaliação de 2013(Alves Júnior et al, 2017).…”

Hypsipyla grandella (Lepidoptera: Pyralidae) Boring Khaya ivorensis (Meliaceae) Fruits and Seeds in Brazil: First Report

“…(Meliaceae) plantations began in the mid-1970s in the northern region of Brazil and spread during the late 80s, with seedlings originating from seeds (Ribeiro et al 2016). Restrictions in the market of native Meliaceae (usually endangered species), the high wood quality, and the high resistance of K. ivorensis to H. grandella encouraged expansion of mahogany plantations using this tree in Brazil (Alves-Júnior et al 2017;Ribeiro et al 2017Ribeiro et al , 2018. However, H. grandella has started damaging K. ivorensis shoots in Brazil (Zanetti et al 2017).…”