The Effect of Soil Moisture and Sowing Depth on Reproduction of the Quarantine Weed Oxalis latifolia

Oxalis latifolia was a new-found quarantine invasive weed which caused serious damage to horticulture production. Information on the biological characteristics of its invasion and harm was lacking. Study was conducted to determine the effect of soil moisture and sowing depth on the number, weight, hundred bulb weight of O.latifolia child bulbs. Moreover, contractile roots of different treatments were either examined. O.latifolia was showed a little high drought resistance. There was not significant for bulb number treated by watering interval among 3, 4 and 5 days; while it was significant for bulb fresh weight treated by watering interval among 2, 3 and 4 days.Meanwhile, O.latifolia possessed a strong burial resistance. The number and weight of child bulbs sowing in 8 cm was significantly higher than that of sowing in surface. The weight of contractile roots showed very sensitive to sowing depth. Contractile roots were promptly reduced as sowing depth was increased and was disappeared when O.latifolia was sowed in 6 cm depth. The above results were indicated that O.latifolia is a weed with high ecological adaptation to drought and deep burying.