Resumo

AGUIRRE YATO, Guillermo  e  ALEGRE ORIHUELA, Julio. Use of non-conventional sources of nitrogen in corn (Zea mays L.) fertilization in Cañete (Perú). I: yield and N, P and K uptake. Ecol. apl. [online]. 2015, vol.14, n.2, pp.157-162. ISSN 1726-2216.

Meat and fish industry produce residues that can be used in agriculture. With this purpose, an experiment was developed at Cañete Valley (Perú), in a maize crop field, in order to compare the use of hooves and horn meal (HHM), hydrolyzed residues (HR) from the fish industry and chemical fertilization. Total biomass production, grain yield and harvesting index were quantified. There were significant differences among treatments. The highest biomass production and grain yields were found in the NPK, HHM + PK and HR + NPK treatments. Treatments with HR, 0PK, 000 presented the lowest production. Harvesting indexes ranged between 0.48 - 0.52. On average, nutrient extraction in (kg t^-1) of grain yield reached the following results: 23.8 N, 12.3 P2O5 , 23.6 K2O. Nitrogen concentration in parts of the plant had the following order: grain > corn tassel > leaves > cob > stalk > cob husk, for nitrogen. For phosphorus it was as follows: grain > corn tassel > leaves > stalk > cob husk and cob. For potassium: stalk > leaves > cob husk and corn tassel > cob > grain. In conclusion, the HHF can be used as a source of nitrogen in the same way as chemical fertilizers for cropping systems but more studies are needed in relation to the use of HR.

Palavras-chave : hooves and horn meal; hydrolyzed residues; nutrient uptake; nutrient concentration.

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