Arbuscular Mycorrhizas in Sugarcane Under Planting Systems and Sources of Nitrogen

Abstract

This study aimed to evaluate the density of spores and mycorrhizal colonization in roots of sugarcane varieties (RB86-7515, CTC-4 and CTC-15), under planting systems, being the planting of stem portions and pre-sprouted seedlings (PSS) along with 3 sources of nitrogen: granular fertilizer, leaf application and inoculation with diazotrophic bacteria (Azospirillum brasilense). The experiment was deployed on the experimental campus of the Evangelical School of Goianésia, and was collected soil samples for spore count after the first cut. The experimental design was arranged in factorial 3x2x3 in randomized blocks with subdivided plots using 4 repetitions per treatment, where factor 1 was represented by varieties, factor 2 by planting systems and factor 3 by nitrogen sources. The planting of PSS associated with foliar fertilization and A. brasiliense presented better colonization that in PSS with granular fertilizer and stem portions with leaf fertilizer and via inoculant. The granular fertilizer showed increased amounts of spores over the foliar fertilization and inoculation of Azospirillum brasilense, the planting system of stem portions presented greater quantity of spores over the planting of PSS, it is worth mentioning that approximate results of spore density, mycorrhizal colonization and productivity without adding granular fertilizer are satisfactory for reducing the use of fertilizers.

Seasonal Variation in Mycorrhizal Community of Different Cerrado Phytophysiomies

“…Studies developed by de Miranda (2008) found these genera in agroecosystems of Cerrado. Moura et al (2017) verified the presence of these genera in sugarcane under Cerrado soil, and other studies also verified the presence of these genera, indicating low specificity to plant species, and may colonize most of the vegetables of this biome (Casagrande, 1985;Vieira, 2001;Lacerda et al, 2011;Angelini et al, 2012;Ferreira et al, 2012). Glomalin is a glycoprotein produced by AMF and released into the soil acting on soil aggregation and structuring (Hammer and Rillig, 2011).…”

“…The Cerrado biome is an environment that naturally offers adverse abiotic conditions for plant growth and development. With low phosphate levels and limited water regime, plants depend directly on the performance of mycorrhizal fungi to resist such conditions, attributing to the association between fungi and plants, which is an important resilience factor to stressful situations (Thomazini, 1974;Porcel and Ruiz-Lozano, 2004;Hunke et al, 2015;Moura et al, 2017). According to Pirozynski (1981), the mycorrhizal association with vascular vegetables would have begun its evolution in the tropics, and there are species that are even found only in these regions.…”

“…According to Pirozynski (1981), the mycorrhizal association with vascular vegetables would have begun its evolution in the tropics, and there are species that are even found only in these regions. Today, its presence is currently reported in different regions of the planet, regardless of the region's climate (Khan, 1993;Vestberg, 1995;Aliasgharzadeh et al, 2001;Muthukumar et al, 2004;Gehring and Connell, 2006;Moura et al, 2017).…”

Arbuscular mycorrhizal fungi in the soil using cover crops with and without nitrogen addition

“…Cover plants are responsible for soil protection in these systems and can influence the diversity and richness of the rhizospheric microorganism community in the soil (Alguacil, 2015). Arbuscular mycorrhizal fungi (AMF) are one of the most important groups of edaphic organisms, and their activity is closely linked to plant health and can be used as a bioindicator of environmental quality in different soil management systems (Borie et al, 2006;Alguacil et al, 2008;Alguacil, 2015;Moura et al, 2017;Moura and Cabral, 2019).…”