Resumen

RUIZ, César; RUSSIAN, Tania  y  TUA, Domingo. Effect of the organic fertilization in the cultivation of the onion. Agronomía Trop. [online]. 2007, vol.57, n.1, pp.7-14. ISSN 0002-192X.

In clay loam soils classified as Haplocambids, located in the municipality of Federacion, Falcon State, five (cane trash (bc), coffee pulp (pc), caprine manure (ec), bovine manure (eb), hen dung (g) alternative sources of organic fertilizers applied to an onion crop, cv. Texas Grain 438, at a rate of 30 T ha^-1 were evaluated. Chemical fertilization was also applied at 160 kg ha^-1 of ammonium nitrate, 120 kg ha^-1 of fosfopoder and 230 kg ha^-1 of K(NO₃)₂. A random block experimental design was used with six (6) treatments and three repetitions. Each treatment consisted of six furrows of 1,5 m of length, separated 0,60 cm. At 86 days the following variables were measured: plant height (ap), number of leaves, (nh), number and average weight of bulbs (pb) and bulb diameter (db); and at 116 days, the productivity, through the number of plants, production, weight average of the bulb and yield (r). The ec promoted greater ap, db, and nh, showing significant differences (P£0,05); the greatest r was reached with the bc application (30,08 t ha^-1), followed by eb and pc, with 29,26 and 28,38 kg ha^-1, respectively. With respect to productivity variables no statistical differences were found. Since in all cases the smallest average corresponded to the control, it is recommended to continue the investigations including the analysis of the chemical properties of the soils.

Palabras clave : Onion; Allium cepa L; trash; manure; fertilization; yields.