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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

CASTILLO, Claudia; HUENCHULEO, María José; MICHAUD, Andrés  y  SOLANO, Jaime. Mycorrhizae in a potato crop added Twin-N biofertilizer in an Andisol of the Araucanía Region. Idesia [online]. 2016, vol.34, n.1, pp.39-45. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292016000100005.

Environmental concerns about negative effects caused by chemicalfertilizers stimulated research on ecological crop management methods, in recent years, such as the use of biofertilizers,for examplefree living nitrogen-fixing microorganism. During the 20132014 seasons, afield trial was established at the Estación Experimental Pillanlelbún that aimed to assess the effect ofthe biofertilizer Twin N on potato variety Desireé. Twin-N contains bacterias ofAzospirillum genera in a concentration of 1x1011 UFC g-1 pc. An experimental block design with completely randomized, three treatments and four repetitions was used. The treatments were: T0 = control with chemical fertilization at planting (CFS), T1 = CFS + 50 kg N ha-1 (at ridging) and T2 = CFS + 1 L Twin-N ha-1 (at flowering). At harvest, number of tubers per plant, yield per hectare and health of tubers were recorded. Root colonization with arbuscular mycorrhizal fungi (AMF) was determined, and the number of spores ofAMF was quantified. Regarding mycorrhizal fungal parameters Twin-N treatment had the lowest root colonization and a low number ofspores in the rhizosphere; accompanied by a significant increase in tuber yield. Twin-N apparently improved the effectiveness of native fungi. Differences were found in disease incidence of dry rot and craters. It is concluded that the addition of the biofertilizer Twin-N to a potato crop can partly replace chemical nitrogen fertilization.

Palabras clave : arbuscular mycorrhizal fungi; tuber size; biofertilizers; potato scab.

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