Vol 23, No 4 (2021)

Table of Contents

Original articles

Presence of steroid hormones in Lake Titicaca and drinking water, Puno (Peru)
Walter Zamalloa-Cuba, Sirleith Siomara Condori Canaza, Olivia Magaly Luque Vilca, Luiz Tornisielo Valdemar , Franz Zirena Vilca
DOI: https://doi.org/10.18271/ria.2021.307
Characterization of horticultural farms in Cerro Punta, Chiriqui, Panama
Rito Herrera, Rubén Collantes, Martín Caballero, Javier Pittí
DOI: https://doi.org/10.18271/ria.2021.329
Response of with yam to different planting densities and trellis height
Ricardo Enrique Tamara Morelos, Lily Lorena Luna Castellanos, Amaury Aroldo Espitia Montes, Rafael Segundo Novoa Yanez , Sol Mara Regino Hernández, Víctor Alfonso De la Ossa Albis
DOI: https://doi.org/10.18271/ria.2021.271
Estimation of forage consumption for two dairy cattle biotypes in the high Andean tropics of Nariño, Colombia: Consumo materia seca bovinos
Juan Leonardo Cardona Iglesias, Yesid Avellaneda Avellaneda, Edwin Castro Rincón
DOI: https://doi.org/10.18271/ria.2021.301
Copulation length on ovulatory and pregnancy rate in alpacas
Jesús Martín Urviola Sánchez, Madeley Gladys Hilasaca Mamani, Francisco Halley Rodríguez Huanca, Víctor Raúl Leyva Vallejos
DOI: https://doi.org/10.18271/ria.2021.296
Impact economic of climate change on crop of organic quinua in the Altiplano Region: a Richardian approach
Eusebio Benique Olivera
DOI: https://doi.org/10.18271/ria.2021.239

Review article

Census of aquatic birds and conservation of wetlands in the high Andean slopes of Peru
Victor Pulido Capurro, Ernesto Málaga Arenas, David Velarde Falconí, Dominga Micaela Cano Coa, Edith Olivera Carhuaz, Jessica Acevedo Flores
DOI: https://doi.org/10.18271/ria.2021.310
Rhizobia induction mechanisms to reduce drought stress in legumes
Nery Santillana
DOI: https://doi.org/10.18271/ria.2021.263

Short article

Antioxidants and total polyphenols of a black chocolate whit incorporation of unroasted cocoa (Theobroma cacao L.)
Clorinda Yordana Chacón Ortiz, Pati Llanina Mori Culqui, Segundo Grimaldo Chavez Quintana
DOI: https://doi.org/10.18271/ria.2021.331
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