WEED MANAGEMENT ON THE CORN CROP FERTILIZED WITH POULTRY LITTER

ABSTRACT - In this work, the application of poultry litter for corn crop, its influence on the weed community and the interrelation with mechanical and chemical control methods were investigated. Before management, weed phytosociological analysis were done, adopting six treatments and six replications. A randomized blocks design in a factorial 2x5+2 was adopted to evaluate the control methods. The first factor was the form of control, application of herbicide nicosulfuron in post emergence and mechanical control (hand weeding). The second factor was the doses of poultry litter that corresponded to 0, 50, 100, 200 and 300% of corn N recommendation. The checks consisted of the two methods of weed control associated with recommended N using mineral fertilizer. The corn plant height was evaluated at 14 and 28 days after management. The results showed that the incorporation of poultry litter promoted changes in the relative importance of weed species, until the time of control. The weed control method did not affect corn yield; however, the plant height 47 days after sowing with mechanical control was higher. With the poultry litter dose corresponding to 200% of the recommended nitrogen, corn grain yield was similar to that obtained with mineral fertilizers. Key words: Systems fertilization, anticipation of fertilization, organic fertilization, Zea mays. Key words: Systems fertilization, anticipation of fertilization, organic fertilization, Zea mays. MANEJO DE PLANTAS DANINHAS NA CULTURA DO MILHO SUBMETIDO A ADUBACAO COM CAMA DE FRANGO RESUMO - Na pesquisa, investigaram-se a incorporacao de cama de frango na cultura do milho, sua influencia na comunidade de plantas daninhas e inter-relacao com os controles mecânico e quimico. Antes do controle, realizou-se a analise fitossociologica de plantas daninhas, adotando-se seis tratamentos e seis repeticoes. Para avaliacao dos metodos de controle, foi adotado o delineamento de blocos ao acaso, em um esquema fatorial 2x5+2. O primeiro fator foi a forma de manejo, herbicida nicosulfuron em pos-emergencia e controle mecânico (capina manual). O segundo fator foram doses de cama de frango correspondendo a 0, 50, 100, 200 e 300% do N recomendado para o milho. As testemunhas consistiram dos dois metodos de manejo com aplicacao do N mineral. A altura das plantas de milho foi avaliada aos 14 e aos 28 dias apos o manejo. A cama de frango promove mudancas na importância relativa de especies de plantas daninhas ate o momento do controle. Os controles mecânico e quimico nao afetam a produtividade, embora com maior altura de plantas aos 47 dias apos a semeadura com controle mecânico. Com dose de cama de frango correspondente a 200% do nitrogenio recomendado, a produtividade de milho e similar a obtida com fertilizante mineral. Palavras-chave: Adubacao de sistemas, antecipacao de adubacao, adubacao orgânica, Zea mays.