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Ítem Is crop breeding the first step to fill the yield gap? Understanding the impact and constraints of developing new improved varieties(John Libbey Eurotext) Monneveux, P.; Ortíz, O.Ítem Evaluation of the environmental impact of pesticides for pest control in the main horticultural crops of the Chancay-Huaral valley, Lima(Universidad Nacional Agraria la Molina) Rodríguez, S.; Ortíz, O.; Castillo, J.Ítem The potato crop. Its agricultural, nutritional and social contribution to humankind(Springer) Campos, Hugo; Ortíz, O.