Different Nitrogen Fertilisation and Its Results on the Development of Plinia cauliflora Seedlings

Abstract

Aims: The objective of this research was to evaluate the seedling development of Jabuticaba when submitted to different nitrogen fertilisations in two periods of development at a greenhouse. Study Design:  The experimental design was of random blocks. Place and Duration of Study: The work was conducted in a greenhouse of the Pontifical Catholic University of Paraná, located in the city of Toledo - PR. Methodology: The seedlings were planted in pots filled with 25 litres of soil at 14 days before the treatments were implanted, they had the stem diameter and height measured to the initial development data which was used to following comparison with the final development. Were tested five treatments, using the mineral fertilizer Super N (45% of nitrogen): without nitrogen fertilization; 30 kg/ha of N (40mg/dm³); 60 kg/ha of N (70 mg/dm³); 120 kg/ha of N (140 mg/dm³), each treatment had four repetitions, totalizing 20 pots. Results: Elevated doses of nitrogen acted in a variated way stimulating the development with specific characteristics of the evaluated plant. The nitrogen contents (Fig. 3) showed a linear growth at 30 days, reaching its apex in the sample submitted to 90 kg of nitrogen and then decreasing from this point and it stabilises after 60 days, obtaining comparable results in all treatments. The protein production is directly linked to the presence of nitrogen in the vegetal organism, so, high doses provide higher availability of prime matter to the cell, being that, the final stage of maturation is when the fruits accumulate the maximum of protein. Conclusion: The nitrogen fertilisation influence on the development of Jabuticaba seedlings. Higher concentrations decrease the availability of other nutrients, leading to a foliar yellowing, causing losses in the growth and productivity of the seedling. Doses of 60 kg/ha are adequate for the full development of Jabuticaba seedlings.