Citas bibligráficas
Guerrero, J., (2004). Ensayo de extracción periódica de nutrientes con las tuberosas andinas mashua (Tropaeolum tuberosum R. et P.) y oca (Oxalis tuberosa Mol.) en un suelo del valle del Mantaro (Huayao 3,350 msnm) [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/6397
Guerrero, J., Ensayo de extracción periódica de nutrientes con las tuberosas andinas mashua (Tropaeolum tuberosum R. et P.) y oca (Oxalis tuberosa Mol.) en un suelo del valle del Mantaro (Huayao 3,350 msnm) []. PE: Universidad Nacional Agraria La Molina; 2004. https://hdl.handle.net/20.500.12996/6397
@misc{renati/1116579,
title = "Ensayo de extracción periódica de nutrientes con las tuberosas andinas mashua (Tropaeolum tuberosum R. et P.) y oca (Oxalis tuberosa Mol.) en un suelo del valle del Mantaro (Huayao 3,350 msnm)",
author = "Guerrero Lazaro, Juan Miguel",
publisher = "Universidad Nacional Agraria La Molina",
year = "2004"
}
With the purpose of evaluating the absorption of nutrients N, P, K, Ca, Mg, and thus developing absorption curves for these elements, two experiments were conducted with two Andean tuberous plants: mashua (Tropaeolum tuberosum R. et P.) clone "Jerguita," and oca (Oxalis tuberosa Molina) clone "Amarilla." The treatments studied were: 1) manure (5 tons/ha), 2) mineral fertilization 120N — 120 P205— 80K20 (kg/ha), and 3) control. The experiments were conducted in the locality of Huayao, Mantaro Valley, Junín (3,350 meters above sea level), during the 1994-1995 agricultural season. The treatments were statistically evaluated according to a randomized complete block design (RCBD) with three replications for each crop, with a probability value of 5%. Periodic samples of the entire plants were taken at 15-day intervals, totaling 12 for mashua and 11 for oca. The total dry matter accumulation for mashua was influenced by climatic conditions (180 days), which alters the average for that date. This is not the case for oca's dry matter accumulation, which shows sustained growth until the harvest date (195 days). The absorption of nutrients N, P, K, Mg in mashua is a direct reflection of the total dry matter accumulation, while the absorption of Ca shows a general decrease in all treatments toward the harvest date (213 days). The absorption of NPK nutrients in oca is directly influenced by the total dry matter accumulation, while Ca and Mg are not directly influenced by such accumulation from 124 days until harvest (195 days). The highest nutrient absorption occurred for the NPK treatments for both crops, followed by manure treatments and controls. All considered nutrients begin to be absorbed in increasing amounts from 110 days after crop establishment, explained by the initiation and subsequent tuberization development. While the NPK treatment shows higher yield for both crops, it is not statistically different from manure treatments and controls, suggesting their behaviors are similar. The nutrient absorption sequence observed in this study for both crops was: K>N>Ca>P>Mg, with phosphorus being the highest element extracted in low concentrations. Estimated tuber yields for mashua ranged from 40 tons/ha (manure treatment) to 30 tons/ha (control), while for oca, they ranged from 14 tons/ha (NPK treatment) to 9 tons/ha (control). The extraction of the elements considered in the study to produce one ton of tuber per hectare according to treatment (units of elements N, P, K, Ca, Mg in kg/ha) averaged: 1.66, 0.43, 2.11, 1.12, and 0.14 for mashua, and 1.95, 0.25, 2.58, 0.48, and 0.15 for oca, respectively.
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