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The mango tree (var. Maranhão) is a fruit of great relevance in regions with semiarid climate. However, knowledge about the effect of salinity on seedling growth is still incipient. The seedling formation phase is of great importance for the establishment of vigorous plants in the field. Therefore, the research was conducted with the objective of evaluating the mango (var. Maranhão) seedlings irrigated with different saline levels in substrate with and without bovine biofertilizer. The experiment was installed in the Instituto Federal de Educação, Ciência e Tecnologia da Paraíba, Campus Picuí, in a randomized block design with four replications, in a 6 x 2 factorial arrangement, corresponding to six levels of electrical conductivity of irrigation water (0,5; 2,0; 3,5; 5,0; 6,5 and 8,0 dS m), on substrates without and with bovine biofertilizer. The substrate was obtained from a mixture of soil and part of bovine manure in a 2: 1 ratio. The bovine biofertilizer was obtained, 30 days before sowing, from the aerobic fermentation of fresh manure. The dry mass of the leaf was affected as a consequence of the increase of the salinity in the soil solution and, consequently, the decrease of the availability and the absorption of water. However, in the treatments with bovine biofertilizer, the leaf dry mass was significantly higher in relation to the soil without the organic input. It was verified that the differences between the values of the plants cultivated in substrates with biofertilizer surpassed those of plants cultivated in substrates without biofertilizer. It is concluded that the increase in saline levels of water used for irrigation impairs the growth of mango trees (var. Maranhão), mainly after 3,5 dS m -1 of electrical conductivity and that the use of the bovine liquid biofertilizer promotes the formation of seedlings of better quality, with higher growth and accumulation of dry mass.

Qualidade de mudas de manga ‘Maranhão’ irrigadas com água salina e uso de biofertilizante bovino