Abstract

PENTON, Gertrudis; MARTIN, G. J  and  RIVERA, R. Effect of the combination of AMF and chemical fertilization on the extractions of N and K made by Morus alba. Pastos y Forrajes [online]. 2014, vol.37, n.1, pp.38-46. ISSN 0864-0394.

The objective of this study was to characterize the extractions of N and K made by mulberry (Morus alba) and their impact on the Ferralitic Red soil, due to the integrated management of mycorhizal inoculants and chemical fertilization. Morus alba L. var. Tigriada was used as main crop, and Canavalia ensiformis, as a multiplication medium of infective arbuscular mycorhizal fungi (AMF) structures. The commercial product used to inoculate the AMF was EcoMic®, strain Glomus cubense. The studied factors were the fertilization rate and the inoculation form of the AMF. The design was completely randomized, with factorial arrangement. The highest nutrient extractions (250 y 350 kg ha^-1 of N and K₂O) were found in the rainy season of the two studied years and in the combination of AMF and fertilization. The highest availability of exchangeable K followed the same trend of the fertilization rate. The need to apply fertilizers at the beginning as well as the end of the rainy season was proven. The integrated management of the AMF inoculation reduced in 50 % the dose of chemical fertilization. The high extractions of N and K₂O in the treatment of 200-100-100 kg of N, P and K ha^-1 per season did not imply deterioration in the soil chemical quality.

Keywords : fertilizer application; soil fertility; organic matter.

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