0123-42260123-4226S0123-4226201800010002310.31910/rudca.v21.n1.2018.659ColombiaColombiaColombia3006201830062018211233120055952AGRONET201620146322382-91994253819981032009223-452015362200530250-820103233709-172015922197-2081980142-8619954639-491967387200638820044433819-2620112001994744479-50420144022134-402012611110-620161117171569-75198824248804880922-5201591169-74R development Core team.2014201741159159213-20200352199-20320133833236-42201057782000262247-54