AGROCHEMICALS AND STEM CUTTING TYPES FOR PLANTLET PRODUCTION OF Spondias sp

Abstract

Umbu-caja (Spondias sp.) is a fruit tree native to the Northeast region of Brazil, which is grown because of its highly valuable fruits for fruit processing industries. The objective of this work was to evaluate the effect of agrochemical applications and cutting types on the rooting and development of Spondias sp. plantlets. The experiment was conducted at the experimental field of the Embrapa Tropical Agroindustry, in Pacajus, CE, Brazil. A randomize block experimental design was used, with five treatments - control (T1); cuttings with two lesions at the base (CL) + rooting gel (RG) (Sela Gel®) (T2); CL + rooting fertilizer (RF) (Radimax®) (T3); cuttings with two transversal cross sections at the base (CS) + RG (T4); and CS + RF (T5). The environments (blocks) used were: full sun; 100% shade ceiling; 50% shade walls and ceiling; and 50% shade ceiling. The plots consisted of eight cuttings, totaling 160 cuttings. Propagules were taken from Spondias sp. plants to make woody cuttings with length of 25 cm, diameter of 29.7 mm, and mean bud per cutting of 8.7. All cuttings were immediately treated with a 0.05% sodium hypochlorite solution for four minutes before making the lesions and transversal cross sections and applying the treatments. The RG was applied by brushstroke, and the RF was applied by immersion in an aqueous solution of 10 mL L-1 for 10 minutes. The cuttings were planted into 6-liter black plastic pots filled with a pasteurized mixture of vermiculite, coconut husk powder, ground leaf fibers of Copernicia prunifera, and carbonized rice husk (2:1:1:1; v v-1). The treatments and blocks significantly affected the rooting and development of cuttings. The treatment with CS and application of the RG (T4) promoted root callus formation, rooting, and vigorous development of plantlets, whereas the RF (T3 and T5) failed to promote root formation.

Efficiency of Vegetative Propagation of Cajá-De-Jabuti Under Concentrations of Indolebutyric Acid and Grafting Methods

“…In addition to the hormonal balance, other internal and external factors influence the rooting and survival of cuttings, such as the harvest time (RIOS et al, 2012), genotype, temperature and humidity conditions during the period when the cuttings are kept in the greenhouse (DENAXA et al, 2012, ZANG et al, 2013, and conditioning agents applied to the cuttings (MENDES et al, 2019). The IBA concentrations did not influence (p>0.05) the sprouting percentage, which was low, varying from 0 to 7.5%, with sprout emission occurring in only six of the 240 cuttings evaluated (Table 5).…”

Técnicas para formação de mudas de umbu-cajazeira por estaquia

“…Estacas tratadas com Sela Gel ® formaram mudas vigorosas e aptas ao plantio (30,00%) no campo e diferiram das estacas tratadas com Radimax ® (7,50%) e das que não foram tratadas (8,75%), aos 80 dias depois do plantio nos vasos. Mendes et al (2019), avaliando agroquímicos e lesões em estacas de caule na formação de mudas de umbu-cajazeira, observaram que a aplicação de Sela Gel ® em conjunto com ferimento (56,25%) ou incisão (84,38%) na base das estacas, proporcionou médias superiores na formação de mudas aptas ao plantio. Notadamente, o uso do indutor de enraizamento Sela Gel ® influenciou no desenvolvimento das mudas formadas por estaca de ramo lenhoso de umbu-cajazeira, o que pode ter sido proporcionado pela quantidade de AIB presente no produto, bem como pela proteção (formação de película) contra a formação da embolia após o corte e preparo das estacas.…”

Leaf Contents and Biochemical Cycing of Nutrients in Accessions of Umbu and Umbu-Caja

“…In this context, despite the advances of research in the field of fruit characterization (BASTOS;MARTINEZ;SOUZA, 2016;CAMPOS et al, 2018), definition of suitable rootstocks SANTOS, 2009), seedling production by cuttings (MENDES et al, 2019) and physiological characterization (ANTUNES et al, 2016), umbu and umbu-caja currently have no recommended accessions for use on a productive scale or for a specific destination market, either for fresh consumption or for agroindustry, so studies need to be conducted (FREITAS et al, 2015).…”