Quinoa biomass production capacity and soil nutrient deficiencies in pastures, tree plantations and native forests in the Andean Highlands of Southern Ecuador

dc.creatorChacón, Gustavo
dc.creatorGagnon, Daniel
dc.creatorParé, David
dc.date2016-07-01
dc.date.accessioned2023-08-08T19:45:38Z
dc.date.available2023-08-08T19:45:38Z
dc.identifierhttps://revistas.ups.edu.ec/index.php/granja/article/view/24.2016.02
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8057775
dc.descriptionIn the high Andes of Ecuador, although expanding agricultural practices and overgrazing have had negative impacts on soil fertility, few investigations have been conducted to identify which practices are most likely to reduce fertility. Quinoa (Chenopodium quinoa Willd.) was grown in soils from native forests, Nf; pastures, Pa; Eucalyptus globulus Labill. plantations, Eg; and Pinus patula Schlecht. plantations, Pp. A bioassay study was conducted using a randomized block design with control (C), ammonium nitrate (N), triple superphosphate (P), and combined N and P (N+P) fertilizer treatments. On soils from Pp, quinoa mortality was 100% in N, 88% in C, 63% in N+P and 0% in P; P enhanced growth the most; quinoa biomass attained only 0.1 g/pot and had a P content of 0.7 mg/pot. N+P enhanced quinoa growth the most on soils from Nf, Pa and Eg. Here, quinoa biomass (g/pot) averaged 0.1 in C, 0.4 in N, 1.6 in P and 7.2 in N+P; P content (mg/pot) averaged 0.9 in C, 0.6 in N, 12 in P and 38 in N+P. In all soils, PO4- was the principal limiting factor. K deficiencies and Al toxicity probably occurred only in Pp soils. This study suggests that the studied soils cannot support production of quinoa crops without additions of combined fertilizers containing P and K as the principal elements. Pp have the least fertile soils, presumably resulting from a longer history of use after pasturing in addition to the pine effect itself.en-US
dc.formatapplication/pdf
dc.formattext/html
dc.formatapplication/octet-stream
dc.languageeng
dc.publisherUniversidad Politécnica Salesianaes-ES
dc.relationhttps://revistas.ups.edu.ec/index.php/granja/article/view/24.2016.02/1136
dc.relationhttps://revistas.ups.edu.ec/index.php/granja/article/view/24.2016.02/1872
dc.relationhttps://revistas.ups.edu.ec/index.php/granja/article/view/24.2016.02/1873
dc.rightsDerechos de autor 2016 Universidad Politénica Salesianaes-ES
dc.sourceLa Granja; Vol. 24 Núm. 2: (julio-diciembre 2016); 16-28es-ES
dc.sourceLa Granja; Vol. 24 No. 2: (July-December 2016); 16-28en-US
dc.sourceLa Granja; v. 24 n. 2: (julio-diciembre 2016); 16-28pt-BR
dc.source1390-8596
dc.source1390-3799
dc.source10.17163/lgr.n24
dc.subjectagricultural potentialen-US
dc.subjectnutrient deficiencyen-US
dc.subjectvolcanic soilsen-US
dc.titleQuinoa biomass production capacity and soil nutrient deficiencies in pastures, tree plantations and native forests in the Andean Highlands of Southern Ecuadoren-US
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion


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