Resumo

SALAZAR-SOSA, Enrique et al. Residual effect of cow manure on silage corn yield and soil properties. Terra Latinoam [online]. 2010, vol.28, n.4, pp.381-390. ISSN 2395-8030.

The objective of the present study was to evaluate the residual effect of cow manure after 6 years of continuous application, in the silage corn yield and soil fertility characteristics. The research was carried out at the Experimental Center of the FAZ-UJED, Gomez Palacio, Durango, during 2004. The treatments established since 1998 were manure rates of 0, 40, 80, 120, and 160 Mg ha^-1, applied annually to the same plots, as well as a treatment with chemical fertilizer (150-150 kg ha^-1; N-P₂O₅).The results indicated that the best treatments were the rates 40 and 80 Mg ha^-1 of manure, yielding 86.28 and 85.09 Mg ha^-1 fresh weight and 34.83 and 34.81 Mg ha^-1 in dry matter, respectively. After six years of cow manure incorporation to the soil, the initial values indicated that every 100 Mg ha^-1 of manure increased organic matter in 2.11%, nitrate in 44.5 mg kg^-1, and electrical conductivity in 2.71 dS m^-1. After harvest, highe organic matter values, more than 3%, were registered at 0-15 cm depth. The treatment with 160 Mg ha^-1 also showed the highest soil nitrate concentration: 75.5 mg kg^-1. The electrical conductivity was highest in the treatment of 160 Mg ha^-1, with values over 4 dS m^-1. After six years of continuous incorporation of cow manure, residual nitrogen and other nutrients were enough for silage corn production without applying chemical fertilizer.

Palavras-chave : Zea mays; organic matter; electrical conductivity; nitrate.

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