Abstract
To produce seedlings with quality is one of the factors that mostly contribute to increase the production chain of a fruit crop. The use of organic substrates in the production of seedlings becomes a way to reduce costs by using raw material available regionally. Then, the aim of this study was to evaluate the influence of rooting inducers and the contribution of organic substrates to improve the rooting of herbaceous cuttings of 'Paluma' guava. The experiment was completely randomized arranged in a 5×2 factorial design with 4 replications and 10 cuttings per plot. The factors comprised five substrates (S1-100% OC; S2-25% CRH + 75% OC; S3-50% CRH + 50% OC; S4-75% CRH + 25% OC; S5-100% CRH), where CRH: carbonized rice husk and OC: organic compost, and 2 rooting inducers (Radimaxi 20® and Indolbutyric Acid - IBA), with the concentration of 2000 mg L-1. With regard to the analyzed variables, rooting, mortality, length of roots, and dry weight of shoots and roots did not fit with any regression model. However, the live rootless cuttings, callus, sprouting, leaf retention, and number of roots showed interaction between the inducers and the used substrates. The maximum rooting percentage obtained was 20%, independently of the type of inducer or used substrate; the use of Radimaxi 20® provides greater percentage of cuttings with callus and live rootless cuttings; the carbonized rice husk in composition S2 (25% CRH + 75% OC) is indicated to compose the rooting substrate of 'Paluma' guava cuttings; despite the satisfactory results obtained in this work, more studies are needed to clarify the rhizogenic process of guava in diversified conditions. Key words: Indolbutyric acid, vegetative propagation. Radimaxi 20®.
Highlights
The cultivation of guava (Psidium guajava L.) has great economic importance in the area of fruit processing industry, with the 'Paluma' cultivar as the most widely used, with 70% of production for the industrial processingAfr
Showed that in the first stage of induction and formation of roots, the nutrients calcium, iron, copper, boron, zinc, and manganese are important to trigger the process, since they take part of the cell wall formation, lignification, and cell elongation, being these processes essential for root growth. Considering these evidences and the importance of cuttings propagation in the commercial production of guava, this work aimed to verify the influence of rooting inducers and the contribution of organic substrates to improve the rooting of herbaceous cuttings of 'Paluma' guava
The experimental design was completely randomized in a 5×2 factorial design, with five substrate compositions (S1-100% OC; S225% CRH + 75% OC; S3-50% CRH + 50% OC; S4-75% CRH + 25% OC; S5-100% CRH), where CRH: carbonized rice husk and OC: organic compost, and 2 rooting inducers (Radimaxi 20® and Indolbutyric Acid - IBA) used in the concentration of 2000 mg L-1, with four replications and 10 cuttings per plot
Summary
The cultivation of guava (Psidium guajava L.) has great economic importance in the area of fruit processing industry, with the 'Paluma' cultivar as the most widely used, with 70% of production for the industrial processingAfr. The cultivation of guava (Psidium guajava L.) has great economic importance in the area of fruit processing industry, with the 'Paluma' cultivar as the most widely used, with 70% of production for the industrial processing. One aspect that affects the process of commercial propagation by cuttings in guava, aiming to produce fruit with quality, is the cutting type. For this crop, herbaceous cutting has been widely used, since the plantlets grows more quickly, provides a homogeneous orchard, demands less time of work, and provides high-quality plantlets at lower cost (Zietemann and Robert, 2007; Zem et al, 2015)
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