Arroz de terras altas inoculado com bactérias diazotróficas associativas e submetido à disponibilidades hídricas

Abstract

With the population increase, the need for greater production in the same agricultural areas, has a direct influence in the search for new technologies that reduce costs and help in the maintenance of the environment. In this way, the present work aimed to evaluate the effects of water availability on upland rice inoculated with associative diazotrophic bacteria. The work was developed in a greenhouse, where cultivar used in the study was BRS Esmeralda indicated for upland regions. The statistical design was completely randomized in a 4x2 factorial scheme, with four water availability (40%, 60%, 80%, 100% of pot capacity), and two nitrogen sources (urea and commercial inoculant) with 5 rehearsal. The number of grains and tillers, grain weight, shoot dry weight, plant height, Falker chlorophyll index, root volume and root dry weight were evaluated. The results were submitted to analysis of variance and regression test, adopting up to 5% of probability. There was no interaction between the factors for the analyzed variables. However, it presented a significant difference between the nitrogen sources for the root volume and shoot dry matter variables, with a significance of 5% for the Tukey test. In the variables tiller number, Falker chlorophyll index, grain weight, plant height, root dry weight and number of grains, an isolated effect was observed for water availability. The water availability that provided the best development for the BRS-Esmeralda cultivar was 90% of the wetness retention capacity of the pot.