Productivity and nutritional characteristics of ramie (Boehmeria nívea cv Myasaki) in four cutting frequencies fertilized with mineral or organic nitrogen

Abstract

This work was conducted in the Development Research Unit, in Itapetininga (23º35'30''S, 48º03'11''W and 670 m altitude), SP, Brazil, in a red darkness latosol, the Rami (Boehmeria nivea cv. Myasaki) was evaluated under two nitrogen sources (mineral: ammonium sulphate; organic: manure) and four cutting frequencies (28, 35, 42 and 49 days). Each N source, application in the basis of 100 kg/ha/year of N, was made after each cut. From May 2006 to May 2007, after the uniformity cut 13, 10, 8 and 7 cuts were made at 28; 35; 42 and 49 days interval. Fresh matter (FM), dry matter at 65ºC (DM at 65ºC), dry matter (DM), digestible dry matter, crude protein (CP) and crude fiber (CF) yields, as well quantities of calcium extracted (Ca) and phosphorus (P) were evaluated. There weren't statistical significantly between two N sources in the studied variables. Dry matter production increased in a positive linear way with increased cutting interval. Year production of FM, DM at 65ºC, DM and CP reached 132.37; 19.24; 17.71 and 3.4 t ha-1, respectively. Ramie CP and DM yield were higher than quoted by a good quality tree legume, and their nutritional characteristics slowed conditions to satisfactory attend small ruminant's requirements.

Keywords

• adubação orgânica
• adubação mineral
• nutrição vegetal
• sulfato de amônio