Organic fertilizer in the line sowing in maize growth and yield Aduba o organica na linha de semeadura no desenvolvimento e produtividade do milho

The combined use of chemical fertilizers and organic materials have been recommended as alternative management, enabling the maintenance of high yields and stability. This study aimed to evaluate the influence of levels of manure applied in the row, with and without nitrogen application, in maize development and yield. The experiment was installed in Gurupi - TO, on March 6, 2009. The experimental design was randomized blocks in factorial scheme 8x2, where were used seven levels of manure (0.0; 10.0; 20.0; 30.0; 40.0; 50.0 and 60.0 t ha-1) and one treatment with chemical fertilizer and the second factor were two levels of nitrogen after planting. Were evaluating plants height weekly, from 15 to 57 days after emergency. Was evaluated final plant height, green matter and grain yield. Highest levels of manure led to significant increases in the evaluated characteristics. Nitrogen fertilization after planting promoted increase in grown rate, green mass and final plant height, even with the addition of organic manure. The manure application of 50 t ha-1 without of nitrogen after planting showed equivalent productivity to chemical fertilizer, however, with application of nitrogen after planting in the equivalent manure level was 45.4 t ha-1. When not applied nitrogen after planting, the chemical fertilizer produced grains and green mass equivalent to the highest manure levels, but application of nitrogen after planting in highest manure levels provided yield higher than chemical fertilizer. O uso combinado de fertilizantes químicos e materiais organicos têm sido recomendados como manejo alternativo, possibilitando a manuten o de altas produtividades com estabilidade de produ o. Este trabalho teve como objetivo avaliar a influência de diferentes doses de esterco bovino aplicados na linha de semeadura, com e sem aplica o de nitrogênio em cobertura, no desenvolvimento e produtividade do milho. O experimento foi instalado no Campus experimental da UFT em Gurupi - TO, no dia seis de mar o de 2009. O delineamento experimental foi em blocos ao acaso em esquema fatorial 8x2, utilizando-se sete doses de esterco (0,0; 10,0; 20,0; 30,0; 40,0; 50,0 e 60,0 t ha-1) e um tratamento químico testemunha e, como segundo fator duas doses de nitrogênio em cobertura. Foram realizadas avalia es semanais de altura de plantas dos 15 aos 57 dias após a emergência. Foram avaliadas altura de plantas final, massa verde e produtividade de gr os. As maiores doses de esterco promovem aumentos significativos nas características avaliadas. O nitrogênio em cobertura promoveu aumentos nas t