Effect of No-Tillage and Hairy Vetch Mulch on Soil Properties and Tomato Yield in Plastic Greenhouse

摘要

Effectiveness of the no-till and plant residue mulch of hairy vetch (HV) on soil properties and tomato (Lycopersicon esculentum Mill.) yield was examined in plastic greenhouse, andosol soil, in Muramatsu Station, Niigata University. HV was sown at theseeding density of 5kg/10a on October 5，1998 and mowed on May13，1999. Tomato plants *Momotaro T93，， grafted with 'Kagemusha, were planted in 4 types of field, conventionally tilled soil (Till), no-tilled soil (NT), tilled soil with HV mulch (NT-HV)and no-tilled soil with HV mulch (NT-HV) in a plastic greenhouse on May 14 and grown to September 30. Soil hardness in no-tilled soil was higher than that in tilled soils, however HV mulch decreased high soil hardness shown in NT and lightened the ratio-change in three-phases of soil during tomato production inthe soil environment Tomato yield in Till-HV was highest, following NT-HV, and that in NT was smallest. HV contributed high nitrate concentration in tomato plants in early growth period, and led to vigorous growth and fruit enlargement in tomato productivity.