Abstract
The objective of this research was to evaluate the vegetative growth of papaya seedlings, propagated by seeds, regarding the use and application rates of two biostimulants in two types of soil. The experiment was carried out at the State University of Piauí (UESPI)/Campus de Corrente, with papaya (Carica papaya L.) as a research culture, on a screen at 50% brightness. The completely randomized design consisted of four treatments arranged according to the following application doses (0, 4, 8, 12, and 16 ml) using the biostimulant Solofull® and Stimulate® via soil, with six replicates per treatment, totaling 24 experimental units. The soil used came from two situations, soil 1 (area in process of degradation, Gilbués—PI) and soil 2 (pasture area, Corrente, PI). At 65 days after sowing, height, stem diameter, number of true leaves, leaf area, height ratio of plants, and stem diameter and root length were evaluated. The data were submitted to analysis of variance. The degraded area soil provided the best growth of the aerial part. The types of biostimulants and application doses used in this study did not provide significant differences between treatments.
Highlights
Papaya (Carica papaya L.) is one of the main fruits grown in tropical and subtropical regions
The analysis of variance in the present study showed that the soil type had a significant effect on the evaluated characteristics, except for root length
Corroborating with the data found in this study (Table 4), it appears that the leaf area was the only variable evaluated that showed significance regarding the interaction of factors, soil, biostimulant, and applied dose
Summary
Papaya (Carica papaya L.) is one of the main fruits grown in tropical and subtropical regions. Brazil is the world’s second largest producer of fruit with 1,517 t/year (FAO, 2017). Since the Northeast region is responsible for 59.45% of the quantity produced, followed by the Southeast (34.85%), North (4.72%), Midwest (0.70%) and South (0.28%), respectively (IBGE, 2018). This is due to the techniques applied in the management of the culture, among them, the production of seedlings. The papaya seedling production process is one of the most important stages of the production system. Papaya can be propagated through seeds or vegetatively (cutting and grafting) (Nguyen & Yen, 2018)
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