Nitrogen Accumulation and Initial Growth Response in Lettuce Planted at Different Periods After Hairy Vetch Incorporation
One-month-old lettuce seedlings were planted in the field with and without prior hairy vetch (Vicia villosa L.) incorporation (HV and Fallow, respectively).The periods between hairy vetch incorporation and lettuce planting were 1 day, 8 days and 15 days.The inorganic nitrogen concentration in the soil was higher after hairy vetch incorporation, as