Resumo

RAMIREZ, J. F et al. Influence of fertilization on the physical and chemical properties of a soil dedicated to the production of Megathyrsus maximus seed. Pastos y Forrajes [online]. 2015, vol.38, n.4, pp. 393-402. ISSN 2078-8452.

The influence exerted by different fertilizer doses on the physical and chemical properties of a ferruginous Gley Nodular soil, dedicated to the production of Megathyrsus maximus (Guinea grass) cv. Likoni seed, was studied. The design was randomized blocks, with four replications, and the following treatments were evaluated: control (without fertilizer); 3, 6 and 9 t of earthworm humus per hectare; 20, 40 and 60 t of cattle manure per hectare; and 180-50-75 kg of NPK per hectare. The values of the real and apparent density fluctuated among the treatments; but, in general, they were at the end higher (p = 0,05) in the control and in NPK, for the depths 0-10 and 10-20 cm, respectively. The natural humidity was higher (p = 0,05) when applying 9 t of humus and 60 t of manure; while porosity did not differ among the treatments. The organic matter increased, and the best result (p = 0,05) was obtained in the treatment of 9 t of humus. The seed yield with 9 t of humus was similar to that of NPK (between 41,0 and 91,3 kg of PGS/ha); however, the profit for the sale of seeds and the profit per hectare were higher in the treatment with 9 t of humus, which propitiated a lower production cost (10,30 vs. 16,50 pesos/kg of seed for humus and NPK, respectively). It is concluded that the use of organic fertilizers in the systems of Guinea grass seed production is feasible, from the productive and economic point of view.

Palavras-chave : cattle manure; earthworm humus; seed production.

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