Peruvian Journal of Agronomy <p><strong>Scope</strong></p> <p>Peruvian Journal of Agronomy (e-ISSN: 2616-4477) is an international journal <strong>edited </strong>by the Universidad Nacional Agraria La Molina (UNALM). This journal publishes innovative and original research in the following areas of agricultural science: Entomology, Phytopathology, Plant Breeding, Horticulture, and Soil science. This journal publishes in American English for university audience as well as the general scientific community. The objective of the journal is to disseminate the results of research by Peruvian and foreign investigators, through scientific articles, which represent a contribution to the development of science and technology in our area.</p> <p><strong>About the journal</strong></p> <p>Our journal<strong> </strong><strong>doesn’t have any charges</strong> and publishes <strong>every four months (four-month periodicity):</strong> January to April (1), May to August (2), September to December (3). Peruvian Journal of Agronomy, an open-access journal, publishes under <span style="color: #0000ff;"><strong>CC BY license</strong></span>, and is included in <span style="color: #0000ff;"><strong>DOAJ, DIALNET</strong>, <strong>INDICE DE ACTUALIDAD IBEROAMERICANA </strong></span><span style="color: #111111;"> and <strong>LATINDEX</strong><strong> </strong><strong> </strong></span><strong><span style="color: #0000ff;">CATALOGO 2.0</span></strong></p> <p>All manuscripts submitted to Peruvian Journal of Agronomy are subject to a double-blind peer review process.</p> <p>Do you want to publish in our journal? Please review the <a href="">author guidelines </a>and <a href="">the sample</a>. The following documents must be submitted to <strong></strong>: cover letter and manuscript</p> Universidad Nacional Agraria La Molina en-US Peruvian Journal of Agronomy 2616-4477 Effects of seedling thickness on the production and quality of onion (Allium cepa L.) ‘Santa Rita’ in Arequipa, Peru <p>Onion crop begins with seedling preparation and finishes with transplanting. In some Peruvian onion-productive areas, it is assumed that seedling thickness is important to have a better yield. Four different seedling thickness of red onion (Allium cepa L.) were evaluated between February and June 2017 in Santa Rita de Siguas, Arequipa, Peru. The seedling thicknesses evaluated were very thin (2.00 mm – 3.49 mm), thin (3.50 mm – 4.99 mm), standard (5.00 mm – 6.49 mm) and thick (6.50 mm – 7.99 mm). The plant density was 340 000 plants ha−1. The experimental design was a randomized complete block with four treatments and five replications. The variables evaluated were plant height (cm), leaf number, stemlike diameter (mm), bulb diameter (mm), total yield (t ha−1), and marketable yield categories (t ha−1). The leaf number, plant height, and stemlike diameter among treatments were significantly different, with higher values in the “standard” and “thick” treatments up to 60 days after transplanting. The harvest was earlier in the “standard” and “thick” treatments. The “very thin” and “thin” treatments needed more days to harvest than the others. The “thin” treatment showed the highest total yield. There were no significant differences between marketable yield categories in all treatments. It was concluded that seedling thickness upon transplanting influences the yield under the conditions in this study.</p> Diego Almeyda Carbajal Andrés Virgilio Casas Díaz Mirna Zuzunaga Bedón Copyright (c) 2021 Andrés Virgilio Casas Díaz, Almeyda Carbajal Diego, Mirna Zuzunaga Bedón 2021-12-30 2021-12-30 5 3 71 77 10.21704/pja.v5i3.1845 Control of avocado root rot caused by Phytophthora cinnamomi with different Trichoderma strains at Chavimochic Irrigation Project <p>Avocado root rot caused by Phytophthora cinnamomi is one of the main problems affecting avocado (Persea americana) cultivation in Peru, especially at the Chavimochic Irrigation Project. The objective of this study was to evaluate the effect of different Trichoderma strains on the control of Phytophthora cinnamomi in Zutano rootstock under greenhouse conditions. Five isolates of Trichoderma were tested: Trichoderma sp. (Chav01); Trichoderma harzianum (Chavo2); Trichoderma harzianum (UNALM01); Trichoderma viride (UNALM02); and a commercial strain of Trichoderma sp. Evaluations were performed at 30, 45, and 60 days. All isolates colonized the rhizosphere of the avocado. No relation was found between the formation of more Trichoderma colonies and Phytophthora improved control. All strains controlled the root rot, but Chav01 and Chav02 showed the greatest diameter of stem, dry matter in the root, and percentage of healthy root in comparison with UNALM01, UNALM02, and the commercial strain. Thus, the native isolates of Trichoderma from the Chavimochic area can be added to the list of potential new Trichoderma species to control Phytophthora cinnamomi.</p> Paul Gastañadui Rocío Moreno Patricia Elena Quiroz-Delgado Walter Eduardo Apaza-Tapia Copyright (c) 2021 Paul Gastañadui, Rocío Moreno, Patricia Elena Quiroz-Delgado, Walter Eduardo Apaza-Tapia 2021-12-30 2021-12-30 5 3 78 86 10.21704/pja.v5i3.1846