Abstract
Looking for ecologically alternative methods in onion production, this experiment was dome at the Universidad Autónoma Chapingo during the spring-summer cycle in 1992. The main purpose was to evaluated biological, technical and economic response of this crop to the biofertilezer LEDA (Liquid Effluent from an Anaerobic Digestor). Applied soil treatments were done by linear meter to the crop 500, 750 and 1,000 ml of LEDA alone; another with 250, 500 and 750 ml of LEDA treatments combined with chemical fertilizer 60-40-00 kg of NPK, a chemical treatment with 120-80-00 kg of NPK was also included; another LEDA treatment of 1,000 ml was applied in gour parts to the foliage. Results showed that mixed LEDA and chemical fertilizer gave the best results in leaf number, meridional and equatorial bulb diameter. The highest value for fresh bulb weight (22.26 t/ha) was obtained when 750 ml of LEDA combined with 60-40-00 kg of NPK, having better results than chemical fertilizer (16.81 t/ha) and biological fertilizer (17.36 t/ha). Foliar application of LEDA avoided the attack of the pests and diseases at a low level.
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