ISSN 0377-9424Versión digital ISSN 2215-2202

REVISTA DE CIENCIAS AGRÍCOLASUNIVERSIDAD DE COSTA RICA

COLEGIO DE INGENIEROS AGRÓNOMOSMINISTERIO DE AGRICULTURA Y GANADERÍA

www.cia.ucr.ac.cr www.mag.go.cr/rev_agr/index.html

AGRONOMÍACOSTARRICENSE

Enero - Junio 2016 Volumen 40 Número 1

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Contents

AGRONOMÍACOSTARRICENSEVOLUME 40 NUMBER 1 2016

Biannual journal of agricultural sciencesof the University of Costa Rica,

the Society of Ingenieros Agrónomosand the Ministry of Agriculture

Obituary .................................................................................................................................................................. 7-10

Scientific papers

Evaluation of african star grass (Cynodon nlemfluensis) silage quality when mixed with three different additives.Luis Pineda Cordero, Pablo Chacón Hernández and Carlos Boschini Figueroa ............................................... 11-27

Partial nitrogen balance in the cropping system of corn (Zea mays L.) with leguminous cover in Chiapas, Mexico.José David Álvarez-Solís, Ramón Muñoz-Arroyo, Esperanza Huerta-Lwanga and José Nahed-Toral ............. 29-39

Blood concentration of β-hydroxybutyrate in Jersey and Holstein herds under grazing and its association with productive, reproductive and health indicators.Alejandro Saborío-Montero y Jorge Ml. Sánchez† ............................................................................................... 41-50

Effect of charges in post-harvest handling on the quality and shelf-life of coyote coriander (Eryngium foedium L.) for export.María del Milagro Cerdas Araya and Marta Montero Calderón ........................................................................ 51-64

Effect of chopping on the nutritional and fermentative characteristics of kikuyu, perennial ryegrass and reed canary grass based silages.Luis Villalobos and Jose Arce ................................................................................................................................ 65-74

Technical notes

Notes on management of lychee trees (Litchi chinensis) and its relation to flower induction.Patricia Quesada and Carlos Luis Loría .............................................................................................................. 75-80

Application of GPS and GIS to study foraging behavior of dairy cattle.Jairo Mora-Delgado, Nicole Nelson, Anais Fauchille and Santiago Utsumi ...................................................... 81-88

Analysis and comment

Costa Rica’s prohibitions and restrictions on agricultural pesticides use and marketing.Edgar Rojas-Cabezas ............................................................................................................................................. 89-105