Initial development of two eucalyptus hybrid submitted to irrigation

Gabriel Q De Oliveira,Jean C L De Oliveira,Adriano S Lopes,Norton H Rego,Leandro H Jung

doi:10.1590/s0100-69162013000600003

Abstract

The eucalyptus offers several advantages compared to other forestry species and, by using the irrigation can increase productivity and decrease production time. The objective of the present study was to evaluate two hybrid eucalyptus (Grancam and Urograndis), no irrigation, dripping and micro sprinkler irrigated at 90, 120, 150 and 180 days after transplanting (DAT). The experiment was conducted at the experimental irrigation area in the State University of Mato Grosso do Sul, in the municipality of Aquidauna - State of MS, Brazil. The experimental design was randomized blocks, split plot with four blocks and two replications within each block, and the plots were composed by irrigation treatments (dripping, micro sprinkler irrigate and dry) and the subplots the hybrids (Grancam and Urograndis).The total area of the experiment had 3 hectares, where each plot consisted of 1 ha. It was evaluated plant height, stem diameter and canopy, stem basal area, the relationship between height and stem diameter, the relationship between height and canopy diameter and stem volume. Data were subjected to analysis of variance and compared by Tukey test at 5% probability. Irrigation systems and dripping sprinkle provide greater plant height, stem diameter, canopy diameter, stem basal area and stem volume.

Highlights

Since 1908 Brazil has been growing eucalyptus and today, 3.5 million hectares of Brazilian land have been covered by planted forests of eucalyptus
The total water sheet applied during the experiment were 518.13, 448.38 and 270.60 mm for managements with micro sprinklers irrigation, dripping irrigation and dryland systems, respectively, and the rainfall corresponded to 270.6 mm (Table 3)
The maximum Etc for the micro sprinklers (4.74 mm) and dripping (3.63 mm) system were detected at 137 days after transplanting (DAT)

Summary

Introduction

Since 1908 Brazil has been growing eucalyptus and today, 3.5 million hectares of Brazilian land have been covered by planted forests of eucalyptus. The production of a forest is determined by the amount of solar radiation intercepted by the canopy and the conversion efficiency of this radiation into biomass. This efficiency is primarily influenced by the availability of water and nutrients ((SANTANA et al, 2008). According to ALVES (2009), for several reasons, including its hardiness, high cost involved in the implementation of irrigation systems in the dimensions of planting areas, and for being a traditionally rained culture, there is little information on the crop water requirements of eucalyptus. According to ALVES (2009), for several reasons, including its hardiness, high cost involved in the implementation of irrigation systems in the dimensions of planting areas, and for being a traditionally rained culture, there is little information on the crop water requirements of eucalyptus. SILVA et al (2011) noted that, typically, the plantations are embedded in ecosystems sensitive to human disturbance due to the rugged topography, soils with low fertility and ancient degraded agricultural areas

Objectives

Methods

Results