Abstract

ABSTRACT: The nutritional management of the coffee clonal garden influences the production and physiological quality and seedlings production of vegetative propagules. Thus, this study aimed to analyze the seedlings’ production from clonal cuttings taken from Coffea canephora mother plants grown with increasing nitrogen mineral doses. The cuttings were taken from C. canephora var. botany Robusta, from the Embrapa Genetic Improvement Program of Rondônia. The mother plants received nitrogen fertilizer at different doses: 0 (Control); 50; 100; 150; 200; 250 and 300 kg of N per hectare divided into 4 applications, during 150 days of orthotropic stems growth (shoots). The following parameters were evaluated: Dry mass of cuttings, nutritional content of cuttings, and seedlings production, with growth analysis at 0, 48, 61, 80, 101, 122, 143, and 164 days after staking (DAS) and analysis of vegetative characteristics at 122 DAS. The nitrogen fertilization in the mother plant resulted in the variation of macronutrient accumulation in cuttings, but the order K> N> Ca> P> Mg> S was maintained, regardless of N dose. In addition, a positive correlation between nitrogen doses and dry matter accumulation, as well as the physiological quality of seedlings was identified.

Highlights

  • Coffea canephora is a species which reproduces by obligatory allogamy due to its characteristics of gametophytic self-incompatibility (MORAES et al, 2018)

  • There is high genetic variability in crops formed with seminal seedlings, resulting in plants with different production potential, (RAMALHO et al, 2016, BERGO et al, 2020), architecture (DALCOMO et al, 2017), and resistance to diseases such as coffee leaf rust (TEIXEIRA et al, 2017), which makes crop management difficult and limits crop yield (ROCHA et al, 2015)

  • Despite the different forms of propagation, staking is the main asexual reproduction technique used in seedling production in C. canephora (FERRÃO et al, 2007; VERDIN FILHO et al, 2014) due to the ease of large scale propagation (OLIVEIRA et al, 2010)

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Summary

Introduction

Coffea canephora is a species which reproduces by obligatory allogamy due to its characteristics of gametophytic self-incompatibility (MORAES et al, 2018). There is high genetic variability in crops formed with seminal seedlings, resulting in plants with different production potential, (RAMALHO et al, 2016, BERGO et al, 2020), architecture (DALCOMO et al, 2017), and resistance to diseases such as coffee leaf rust (TEIXEIRA et al, 2017), which makes crop management difficult and limits crop yield (ROCHA et al, 2015). V.52, n.9, Editor: Leandro Souza da Silva the genetic characteristics of the parent plant, from which the propagules are taken, are maintained and passed on to its descendants, a process called cloning (ANDRADE JUNIOR et al, 2013; RAMALHO et al, 2016). Despite the different forms of propagation, staking is the main asexual reproduction technique used in seedling production in C. canephora (FERRÃO et al, 2007; VERDIN FILHO et al, 2014) due to the ease of large scale propagation (OLIVEIRA et al, 2010)

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