Effect of nitrogen, organic manures and bio-fertilizers on growth and bulb yield of onion (Allium cepa L.) varieties.

摘要

A field experiment was conducted on a loamy sand soil in Anand, Gujarat, India, during the rabi seasons of 2003-04 and 2004-05. There were 24 treatments combinations involving 2 onion cultivars (Local White and Agrifound Light Red) and 12 integrated N levels (inorganic N at 35, 60, 75 or 100 t/ha, farmyard manure (FYM) at 10 or 20 t/ha, poultry manure (PM) at 2 or 4 t/ha and biofertilizers (BF) at 2.5 kg/ha). Local White had significantly the highest values of growth parameters, i.e. plant height, number of leaves per plant and leaf girth, at 60, 75 and 90 days after transplanting as well as yield of onion, i. e. 58.03, 55.25 and 56.64 t/ha during 2003-04, 2004-05 and on pooled basis, respectively, compared to Agrifound Light Red, i. e. 52.43, 49.77 and 51.10 t/ha, respectively. An application of 100 kg N/ha along with 20 t FYM/ha recorded significantly the highest plant height, number of leaves per plant and leaf girth at 60, 75 and 90 days after transplanting during both years and in pooled analysis but, it remained at par with 100 kg N/ha+4 t PM/ha, 100 kg N+10 t FYM+2.5 kg BF/ha and 100 kg N+2 t PM+2.5 kg BF/ha. The bulb yield was found significantly higher in 100 kg N+20 t FYM/ha, i.e. 66.71, 65.23 and 65.97 t/ha during 2003-04, 2004-05 and on pooled basis, respectively, compared to the rest of the integrated levels of N, except for treatments 100 kg N+4 t PM/ha, 100 kg N+10 t FYM+2.5 kg BF/ha and 100 kg N+2 t PM+2.5 kg BF/ha.