Influência da salinidade e adubação na germinação e crescimento inicial do sorgo (sorghum bicolor L. Moench CV. BRS 610).

Abstract

This study aimed to evaluate this research the influente of salinity leveis of irrigation water on the twinning and initial development of sorghum plants (Sorghum bicolor L. Moench cv. Br 610), and the effect of chemical and organic fertilizers in mitigating the possible consequentes resulting from the excess salts in the water, on these stages. The experiment was conducted at the Science Center and Agrifood Technology Federal University of Campina Grande, Campus de Pombal (CCTA / UFCG) in the Forage Sectíon. Irrigation was performed by drainage lysimeter method. plastic pots were used for capacity 20 liters, perforated and connected to the collector hoses for conducting the leached water fraction, in order to control irrigation. The experimental design was arranged in randomized blocks in a 5x4 factorial scheme, considering salino water with tive electrical conductivity values (CEA): 0.3; 2.3; 4.3; 6.3 and 8.3 dS m-' and tour forms offertílizer: 1 - no fertilization (contro1); 2 = organic fertilizer (manure); 3 - 4 - mineral fertilizer and organic-fertilizer, totaling twenty treatments with three replications. They were evaluated germination percentage (% GERM), first count (PC%), emergency velocity index (EVI). At 5 1 days after the start of application of the salt solutions were made Plana height measurements (AP), stem diameter (DC), number of leaves (NF) length (L) and width (L) of the sheet for determining the área leaf. fresh weight of aerial part (DMAP), pre-dry mass (MPS%), dry manter forage (MSF%) and humidity. The plants had a satisCactory development to the levei of salinity 3 (4.3 dS m-l). The organic and organic fertílization were higher in relation to plana height (AP) and fresh weight of shoot (MFPA). Salt stress caused by NaCI adversely affects the sorghum seed germination 6eed BRS 610, reducing the development ofthe plants.