Desempenho produtivo e eficiência do uso da água na cultura do coqueiro anão verde irrigado e fertirrigado na Amazônia oriental.

Abstract

In Brazil, the cultivation of coconut trees is widespread and valued. Within the North region, the state of Pará stands out as the largest producer. Even though it is highlighted, it is necessary to use technologies capable of solving the main obstacles to good production and development of the crop, which are water and nutritional factors. This manuscript, composed of two chapters, aimed to evaluate the productive response and the efficiency of water use in the cultivation of green dwarf coconut palms from Brazil submitted to different irrigation depths and potassium fertilization via fertirrigation in the Eastern Amazon. The experiment was carried out at the Reunidas Sococo farm, located in the municipality of Santa Izabel, Pará, Brazil. The design adopted was in randomized blocks, in a 3x4 factorial scheme with 12 treatments and 3 blocks, consisting of 3 irrigation depths and 4 potassium doses. The collected data were: Fruit weight (PF), Coconut water volume (VAC) and the number of fruits per plant (FP). Coconut water volume (VAC) and the number of fruits per plant (FP). The samples were submitted to analysis of variance and the means compared by Tukey's test at 5% probability in the R software (R Core Team, 2016) and in the events in which there was significance, regression analysis was performed. It was observed from the results a significant interaction between slides and doses. For the FP, the maximum point occurred at the 100% depth and at the 100% dose, with an average value of 1,950 kg fruit-1. For VAC, the interaction happened at the 150% slide and 300% dose, with 298.2 mL fruit-1. As for FP, it was the depth 0% and dose 200% that presented the highest value of 201.3 fruits plant-1. The US variable for fruit yield m3 and volume of coconut water mL m3, both showed maximum results at 100% depth and 300% dose, with values of 15.77 and 29.90, respectively. In general, the tests with irrigation depths and fertilization via fertigation obtained significant results, showing that the ETc 100% depth achieves better performance, whereas the fertilization dose of 300% demonstrates that it manages to enhance the productive performance of the green dwarf coconut tree, proven by EUApac and EUApf. However, it is suggested that new researches be carried out in this bias, to verify the behavior of the variables.