Crescimento e acúmulo de fitomassa de cultivares de sorgo sob turnos de rega.

Abstract

Water scarcity is one of the main problems faced by global agriculture, causing major losses in production and, in more extreme cases, making it impossible to establish cultivated areas. In this sense, the use of management practices is extremely important to face this problem, with the use of cultivars resistant or tolerant to water deficit being a strategy of great importance and already used in agricultural areas. The objective was to evaluate the growth and accumulation of phytomass of sorghum cultivars irrigated with different irrigation shifts, in semi-arid conditions in Paraíba. The experiment was carried out in vessels adapted for lysimeters, in open air conditions, at the Center for Agro-food Sciences and Technology (CCTA/UFCG), Pombal/PB campus. A randomized block design (DBC) was used in a 2 x 5 factorial scheme, with the first factor consisting of two varieties of Sorghum bibolor (CV1 = 'BRS Ponta Negra' and CV 2 = 'AGRI 002E Bolivian giant') and 5 watering shifts (TUR 1 = daily honesty, TUR 2 = honesty every two days, TUR 3 = honesty every three days, TUR 4 = honesty every four days and TUR 5 = honesty every five days) with 4 repetitions. Growth variables were evaluated at 30, 60 and 100 days after the semester (DAS). Phytomass accumulation was determined at the end of the experiment, at 100 DAS. The cultivar ‘BRS Ponta Negra’ showed greater resistance to water deficit compared to the cultivar ‘AGRI 002 Gigante Boliviano’, being the best alternative when the producer has limited water availability on his property. The ‘AGRI 002 Gigante Boliviano’ cultivar, cut 100 days after sowing, irrigated with a two-day irrigation cycle, is the most suitable when the specific purpose is the production of fresh and dry pasta.