An on-farm trial was conducted over two seasons on Vertisols in the Ethiopian
highlands to evaluate a sequential forage/food crop system as an alternative to the
traditional fallow/food crop system. The efficiency of residual nitrogen from
sequential cropping and fallow systems as a supplement to applied nitrogen in a
wheat crop was also tested. Chickpea grown on residual moisture preceded by either
oats/vetch mixture or a fallow had similar yields. In the second year, both wheat
grain and straw yields were significantly increased at the 60 kg nitrogen level
treatment while the straw yield was also significantly increased at the 30 kg nitrogen
level compared to 0 nitrogen level.