Effects of Nitrogen Fertilization Levels and Some Additives on the Chemical Composition and Silage Quality of Forage Rape (Brassica napus Subsp. oleifera) II. Effects of N fertilization levels and formaldehyde treatment on the chemical composition of forage rape silage

질소시비수준과 첨가제가 사초용 유채의 사료가치 및 사일리지의 품질에 미치는 영향 II. 질소시비수준과 포름알데히드 처리가 유채 사일리지의 품질에 미치는 영향

This study was carried out to determine the effects of nitrogen (N) fertilization levels (0, 100 and 200kg/ha) and formaldehyde (0.4,0.8 and 1.2%: w/w CM) on the chemical composition, dry matter (DM) yield and in-vitro dry matter digestibility (IVDMD) of forage rape (Brassica napus Subsp. oleifera) silage. The results obtained are summarized as follows : 1. Forage rape was a catch crop which was highly digestible and low concentration in NDF, ADF, cellulose and lignin. 2. The concentration of the water soluble carbohydrate (WSC) and buffering capacity (PK) was 17.9% and 6.77g/100g, respectively, provided the WSC to PK ratio was 2.65. 3. DM content of silage decreased as the rate of N fertilization increased, but concentration of ammonia-N decreased. IVDMD was not affected by the rate of N fertilization. 4. By the addition of formaldehyde, the pH and IVDMD were increased, but the DM, lactic acid, total organic acid and ammonia-N content of rape silage were decreased, that was effective as a silage additive for forage rape.