2. Materials and methods 2.1. Experimental siteA field experiment was done on a farm located southwest inthe province of Tucuman, Argentina (27◦45S, 65◦39W) in 2009
2. Materials and methods2.1. Experimental siteA field experiment was done on a farm located southwest inthe province of Tucuman, Argentina (27◦45S, 65◦39W) in 2009