Fitomassa e ac迆mulo de nitrog那nio, em esp谷cies vegetais de cobertura do solo para um Latossolo Vermelho distrof谷rrico de Cerrado = Biomass and nitrogen accumulation in cover crops species used in Brazilian Cerrado

作者：Edicarlos Damacena de Souza; Marco Aurelio Carbone Carneiro; Vera Lucia Banys

来源：Acta Scientiarum - Agronomy, 2008.

• conserva o do solo
• manejo do solo
• plantio direto
• leguminosa
• gramineas
• soil conservation
• soil management
• no-tillage
• legume
• grass species

Esp谷cies vegetais com alta produ o de fitomassa s o de fundamentalimportancia para o desenvolvimento sustent芍vel do plantio direto no cerrado. Objetivou-se avaliar a produ o de fitomassa e o ac迆mulo de nitrog那nio em 17 esp谷cies vegetais em um Latossolo Vermelho distrof谷rrico da regi o do Cerrado. O trabalho foi realizado no campoexperimental da Universidade Federal de Goi芍s, localizado no Centro de Ci那ncias Agr芍rias e Biol車gicas no Campus de Jata赤 每 Estado de Goi芍s. O delineamento experimental adotado foi o de blocos ao acaso, com cinco repeti es. Foram utilizadas as esp谷cies: Aveia pretacomum, Aveia preta IAPAR61, Braquiaria brizantha, Braquiaria decumbens, Capim-p谷-degalinha, Milheto BN2, Milheto BRS 1501, Milheto MT, Crotalaria spectabilis, Crotalaria juncea, Guandu normal, Guandu super N, Girassol selvagem, Kenaf 1, Kenaf 2, Nabo forrageiro e Niger. O milheto BRS 1501 obteve a maior fitomassa entre as gram赤neas, a C. spectabilis, entre as leguminosas e o nabo forrageiro, entre as outras fam赤lias. O milheto BRS1501, C. spectabilis e nabo forrageiro tamb谷m obtiveram o maior ac迆mulo de N na parte a谷rea. As esp谷cies nabo forrageiro, kenaf 1 e milheto BRS 1501 s o as mais recomendadas como cobertura do solo para a regi o do cerrado goiano. Plant species that have high biomass production are of fundamentalimportance to the sustainable development of no-tillage systems in the cerrado region. This experiment had the objective of evaluating the biomass production and nitrogen accumulation in 17 plant species in a Oxisol of the cerrado region. This experiment was conducted in an experimental field of the Federal University of Goi芍s, located in the Agricultural and Biological Cientific Center of Jata赤 - State of Goi芍s. The experimental layout was a randomized block with 5 replicates. The following species were used: two species of Avena strigosa, Brachiaria brizantha, Brachiaria decumbens, Eleusine indica, three species of Pennicetum americanum, Crotalaria spectabilis, Crotalaria juncea, two species of Cajanus cajan,Helianthus sp (savage), two species of Hibiscus cannabinus, Raphanus sativus and Guizotia abyssinica. Among the grasses, BRS 1501 millet presented the highest biomass production; among the legumes C. spectablis showed the same behavior; and Raphanus sativus for theother families. These three species also presented higher values for N accumulation in the shoots. The species Raphanus sativus, Hibiscus cannabinus 1 and BRS 1501 millet are the ones recommended for cover crops in cerrado soils in the Goi芍s cerrado region.