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The trial was developed in FZEA/USP/Pirassununga, to evaluate levels of NaCl and N, in two cutting ages, coast-cross (Cynodon dactylon), to observe the response in bromatologico composition and “in vitro” digestibility. As design, was used casualizated blocks applied in fatorial 4x2x2 (levels NaCl x level N x cutting ages), in seedbeds of 3x3 m, with 4 repetitions. The cutting were conducted, in 5 cm, in 30 and 60 days during the times of the spring, summer and autumn, and in 45 and 90 days for winter. Analyses from DM, NDF, ADF, CP, IVDDM, P, K, Ca, Mg and Na were conducted. Analyze from the soil fertility in the beginning and final of the project (0-20 cm and 20-40 cm), to evaluate if had accumulative effect of the salt. Without the interaction, the salt didn’t show significant statistical for variables as DM, NDF, ADF and CP. But was observed a better situation in the jan-may/2002. A little reduction in the levels of Ca and Mg , with the increase from the levels of the NaCl, was observed in Sep-Dec/2001. In the case of Mg (jan-may/2002), P (jul/2002) and IVDDM (winter/2001) showed variation in the different cutting ages correlated with the levels of NaCl. Different levels of N related some variations for IVDDM in winter 2002. The cutting time influenced almost every variable in all times. The levels of N were significated for levels of CP (set-dec/2001). For the variables DM, ADF and IVDDM, during nov/2001-may/2002 these were observed a triple interaction. Data collected the following conclusions: level of Na and N didn’t influence the production and chemical composition, but influenced IVDDM. The plant didn’t show evidence that was affected by Na treatment.

Efeitos de doses de sódio e nitrogênio na composição bromatológica, química e digestibilidade in vitro do capim coastcross (Cynodon dactylon ( L ) Pers.), em duas idades de corte.