Abstract

Conventional onion production in Nueva Ecija, Philippines requires excessive application of inorganic fertilizer and pesticides for maximum yield and protection from pests. In an effort to develop an alternative farming practices that is environment friendly, the research aimed to determine the response of onion on the combined use of organic fertilizer and Trichoderma in split application. The following were the treatments carried out in an organic area in a completely randomized block design: Treatment 1= Organic fertilizer alone (8t/ha) applied at planting; Treatment 2= Organic fertilizer (8t/ha) applied twice (basal and at 30 DAT); Treatment 3= Organic fertilizer (8t/ha) applied twice (basal and at 30 DAT) plus Trichoderma applied once at planting; Treatment 4= Organic fertilizer (8t/ha) applied basal and at 30DAT + Trichoderma applied twice at planting and at 30 DAT ; and Treatment 5= Organic fertilizer (8t/ha) applied twice at planting and at 30 DAT + Trichoderma applied thrice at planting, 30 DAT and during bulb formation Results indicate that the combined application of organic fertilizer (8t/ha) applied twice (basal and at 30 DAT) + Trichoderma applied thrice at planting, 30 DAT and during bulb formation consistently recorded the highest yield of 15.33 t/ha and 14.50 t/ha, during the first and second year trials, respectively.