Effects of different non-chemical weed control on the yield and quality of onion (Allium cepa L.).

Four weed control methods were tested in two densities of onion sown from seeds and one density of onion grown from bulbs. They were pre- and post-emergence flaming in combination with one or two times inter-row cultivation for seed-sown, inter-row cultivation for bulb-grown onion, weed free and control (no seeding). There was no significant difference of dry matter production between high and low crop density at final harvest. High yield loss was observed for seed-sown onion under pre- and post-emergence flaming plus 2 times inter-row cultivation. However, one or two times inter-row cultivation produced high yield in onion grown from bulbs.