Study on No-tillage Silage Corn Production with Legume Hairy Vetch(Vicia villosa Roth) Cover 1. Changes of soil mineral nitrogen, yield and nitrogen uptake of corn by quantity of hairy vetch cover
1998
Seo Jong-Ho National Crop Experiment Station, RDA, Suwon (Korea Republic) Lee Ho-Jin College of Agric & Life Science, Seoul National University, suwon 441-744 (Korea Republic)
No-tillage silage corn with legume hairy vetch(Vicia villosa Roth, HV) has renewed interest in supply of mineral N, soil erosion control at sloping land and weed control by cover of HV killed. This study was conducted to monitor concentration of soil mineral N (NO3 ion-N+NH4 ion-N) and to find out variation of growth, yield and N uptake of silage corn according to quantity of HV cover; HV-removed, 1X-HV, 2X-HV at field of Crop Experiment Station in 1996. HV growth in early in early spring decreased the mineral N of soil depth 7.5~22cm before corn seeding. But, killed HV cover increased the concentration of soil mineral N at surface soil (0~7.5cm) up to 45.4mg/kg at early growth stage of corn. Dry matter(DM) of corn at harvest was lower in HV-removed than in 0kg FN/ha. But DM and N uptake of corn at harvest were increased by quantity of HV-cover increasing from HV-removed to 2X-HV. Hairy vetch could substitute N fertilizer for silage corn by N mineralized from HV killed, but reduced early growth and N uptake of corn before silk by reducing soil mineral N of plow layer.
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