Abstract:

It is an important measure of intercropping and mixture modes of oat and common vetch to increase forage yield and quality. The experiment was carried out to study the effects of different intercropping and mixture modes on forage yield and quality of oat and common vetch under low soil nitrogen environment in Yanqing County of Beijing. The results indicated the forage yield and quality of oat and common vetch were the highest during the oat dough stage and common vetch scorch stage by comparing and analyzing 12 different modes. Compared with oat monoculture, the best planting mode was intercropping of oat and common vetch at 3:1 by which the land utilization ratio (LER） increased by 76%. Dry forage yield was increased by 47% in milking stage and 40% in dough stage. Forage nitrogen yield was also enhanced by 52.6% than oat monoculture and 2.6% than common vetch in milking stage and 97.2% and 103.2% in dough stage, which have been notably differentiated in monoculture（P<0.05）.The dry forage yield in mixture was higher than in monoculture (P<0.05), but have no notably difference in these treatments. Forage nitrogen yield was highest in the mixture of oat and common vetch at 1:2 in two harvest time and LER was increased by 51%. Intercropping and mixture of oat and common vetch can increase 0.3%–22.7% RFV than monoculture. Combined with forage yield, quality, and LER, the best intercropping mode is oat and common vetch at 3:1. The increased forage yield might be related with reasonable row proportion and strap distance in the intercropping.

Key words: Oat, Common vetch, Intercropping, Mixture, Forage yield, Forage quality