Effect of Nitrogen Application and Planting Density on Forage Yield and Quality in Maize(Zea mays L.)

作者 QU Sheng-juan; SHEN Yi-xin

期刊 Jiangsu Journal of Agricultural Sciences , 2009,3:25

摘要 The response of forage yield and quality to nitrogen application and planting density of maize (Zea mays L. ) hybrid CV. Yudan 8 was tested in a field experiment. Dry matter (DM) , Crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber ( ADF) and in vitro dry matter digestibility (IVDMD) of forage were determined at waxen maturity stage after harvested. The results showed that nitrogen application and planting density affected the DM yield of overground part significantly. Dry matter forage yield overground harvested at waxen maturity stage increased with increasing nitrogen application rate and planting density. However, the ear ratio in 200 kg/hm~2 and 300 kg/hm~2 plots were higher than that in 100 kg/hm~2 and 400 kg/hm~2 plots. CP content of forage increased by nitrogen application increasing but dropped with increasing density. CP yield per hectare reached a maximum when nitrogen application was 300 kg/hm~2 and planting density was 1 hm~2 90 000 plants. NDF content dropped a little by nitrogen application increasing, but the difference of NDF among the nitrogen application treatment was not significant ( P > 0. 05 ). Moreover, the content of ADF increased by density increasing. There was a significant difference in content of digestible CP in DM per hectare between different planting density ( P <0. 05). The content of digestible CP in DM per hectare increased by nitrogen application rate increasing firstly from 100 to 300 kg/hm~2 and then dropped when 400 kg/hm~2. Considering response of forage yield and quality of o-verground part to nitrogen application and planting density, we came to the conclusion that the optimal quantity of nitrogenapplication in Nanjing is 300 kg/hm~2 and the optimal planting density is 1 hm~2 90 000 plants.