Avaliação de plantas e da silagem do sorgo forrageiro (Sorghum bicolor (L.) Moench) em função de adubações orgânica e mineral

The objective of the research was to evaluate the growth, productivity and silage sorghum forage BRS Ponta Negra according to organic or mineral fertilizers. The research was conducted in Fanzenda Mata Limpa, Areia-PB. The 166 days trial period after planting on 06 of Junho, 2013. To evaluate the characteristics mofometricas, morphological and morphogenesis, the desing experimental blocks were randomized, on scheme factorial 3x4, three fertilization sources (two organic and mineral), with four replicates: unfertilized, urea ( 50,100,150 kg N/ha), chiken litter (5,10 and 15 Mg/ha) and cattle manure (5,10 and 15 Mg/ha). For evaluations of silage characteristics, the design was completely randomized, with the above-described treatments and three replicates per treatment. Data were subjected to analysis of variance and regression to evaluate the effect of levels of organic and mineral fertilizers. The characteristics evaluated were: plant height (AP), stem diameter (DC), number of plants per hectare (NP), number of leaves (NF), average leaf length (CMF), number of lodged plants (NplaAca), production of green matter (PMV) and dry matter production (PMS), and leaf appearance rate (TApF), rate leaf elongation (TAlF) and stem elongation rate (TAlC). According to the results, there was no effect (P> 0.05) the sources of fertilizer for variables mofometricas, NplaAca and NPLA. The effect of nitrogen source for AP and DC was more pronounced with poultry litter, with values of 233.5 and 297.2 cm for the level 0 and 15 Mg ha-1. For TAlC, there was no effect (P> 0.05). The PMV showed response linear increase in effect (P0,05) das fontes de adubos para as variáveis mofometricas, Npla e NplaAca. O efeito da fonte de nitrogênio para AP e DC foi mais pronunciado com a cama de frango, com valores de 233,5 e 297,2 cm para o nível 0 e 15 Mg.ha-1. Respectivamente para TAlC, não houve efeito. A PMN apresentou resposta linear crescente com efeito (P<0,05) nas adubações orgânicas, com variações de 39.089,4 Kg/ha a 55.831,7 Kg/ha. A PMS foi maior na adubação com cama de frango variando de 9.098,5 a 13.700,2 Kg/ha. Para os teores de MS houve efeito significativo (P<0,05) nas adubações tendo ajuste linear crescente para a adubação com esterco bovino variando de 21,55 a 23,08 % nas aplicações de 0 a 15 Mg.ha-1. Houve efeito significante (P