English

Souza Machado Lindomar,Dezan Cogo Adan,Antonio Tomaz Marcelo,S Ferreira Daniel,Deleon Martins Lima,Francisco Teixeira Do Amaral Jose,Nunes Rodrigues Wagner

doi:10.5897/ajb2016.15558

Abstract

The objective of the study was to differentiate genotypes with higher efficiency and responsiveness to nitrogen supply, to understand how the nitrogen supply can impact the dry matter allocation and the accumulation of this nutrient in the different plant compartments of genotypes of conilon coffee, cultivated under contrasting conditions of nitrogen availability in the soil. The plants were cultivated during 150 days in pots containing 10 kg of soil, in greenhouse. The experiment was set up in a 13×2 factorial scheme, following a completely randomized design (CRD) with three replications. The factors were: 13 genotypes and two levels of nitrogen fertilization (0 and 100% of the N recommended level). The N supply increased between 70 and 210% of the total dry matter and between 360 and 680% of the concentration of N content in leaves of the genotypes of conilon coffee. It was possible to observe that the expression of the genotypes was modulated by the availability of N in the soil, since they presented different behaviors in the studied environments (with 0 or 100% of N supply in the soil). The genotypes CV-03, CV-07 and CV-08 were classified as non-efficient and non-responsive, while the genotypes CV- 01, CV-04 and CV-09 of conilon coffee were classified as efficient and responsive. Keywords: Alpha parameter, Coffea canephora (Pierre ex A. Froehner), mineral nutrition

Highlights

Among the species of the genus Coffea, the species Coffea arabica, Coffea canephora and Coffea liberica have been widely cultivated for beverage production (Ramalho et al, 2013)
This diverse behavior suggests the possibility of selection of genotypes of C. canephora to contrasting soil conditions, especially for areas with low natural fertility, which would be passive of exploration using genotypes of rapid growth and low nutritional demand
The analysis of variance presented significant effect of the interaction between genotypes of conilon coffee and the different scenarios of N supply in the soil (Table 2). This fact indicates that the dry matter accumulation (Table 3) and the N content (Table 4) of coffee plants were mutually influenced by the genetic constitution and nitrogen supply

Summary

Introduction

Among the species of the genus Coffea, the species Coffea arabica, Coffea canephora and Coffea liberica have been widely cultivated for beverage production (Ramalho et al, 2013). Scientific results indicate that N and P supply in the soil can cause alterations in the biomass allocation patterns, making it possible to discriminate genotypes by their tolerance to the deficit of these nutrients in the soil (Colodetti et al, 2014; Martins et al, 2013b, 2015b). This diverse behavior suggests the possibility of selection of genotypes of C. canephora to contrasting soil conditions, especially for areas with low natural fertility, which would be passive of exploration using genotypes of rapid growth and low nutritional demand

Objectives

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Results