Ecofisiologia e alteração bioquímica do arroz vermelho sob níveis de água no solo e cultivo orgamineral

Abstract

Red rice is mainly grown by small farmers in the Northeast of Brazil, where the region is characterized by water scarcity region requires further studies aimed at saving water without harming the cultivation of the crop. In this context the present study sought to evaluate agronomic aspects such as growth and phenology, production and biochemical parameters of the culture of red rice var. 405 EmbrapaMeio Norte grown under water levels in the soil, application of silicon and fertilizer. The experiment was conducted in a protected environment at the Centro de CiênciasHumanas e Agrárias - CCHA, belonging to the UniversidadeEstadual da Paraíba - UEPB Campus - IV Catolé do rocha-PB. The experimental design was completely randomized (DIC) in factorial 4 x 2 x 2 design with four replications, with 16 treatments and 64 experimental plants, which were studied different levels of soil water (N 1 = 70; N 2 = 80; N = 100% of AD), application of silicon (S 1 = with and S 0 3 = 90 and N = without) and biofertilizers (B = with and B = without). Irrigation was done manually, with water supplied via a watering can, according to Monitoring Frequency Domain Reflectometry (FDR) once daily. Data were subjected to analysis of variance, comparing the means obtained with the qualitative factor (silicon and fertilizer), by Tukey test, and performing regression analysis of measurements obtained with the quantitative factors (levels of available soil water). Rice responded significantly to irrigation, for all variables studied, silicon and biofertilizer contributed to a better tolerance of rice to water stress. The orgamineral fertilization increased the concentrations of the osmolytesproline, glycine betaine and trehalose. Drought in red rice increases the concentration of osmo activating protection against cell damage.