Abstract
Abstract The aim of this study was to evaluate the effect of arbuscular mycorrhizal fungi inoculation (AMF - Acaulospora scrobiculata, Acaulospora colombiana and the mixture of these inocula) and doses of organic compost obtained from cocoa shell (0, 5, 10, 20 and 30 g dm-3) on “Morada” soursop seedlings. The experimental design was a randomized block with 4 blocks in a 5 x 4 factorial scheme (AMF x organic compost). After 120 days of growth, it was observed that AMF inoculation increased height, stem diameter and shoot, root and total dry biomass. Organic compost stimulated mycorrhizal colonization and the number of spores with the addition up to 10 g dm-3. Mycorrhizal inoculation promoted increases of P content in soursop leaves. Control plants did not show adequate response to doses of the organic compost applied and it was concluded that AMF inoculation combined with organic compost increased the growth and nutrition of soursop plants.
Highlights
Soursop (Annona muricata L.) is considered the second anonaceous in production and cultivated area in Brazil
There was a significant interaction between applied mycorrhizal treatments and organic compost doses incorporated into the soil (p
The combined application of organic compost and Arbuscular mycorrhizal fungi (AMF) may result in a positive synergistic effect on plant growth (SILVA et al, 2008)
Summary
Soursop (Annona muricata L.) is considered the second anonaceous in production and cultivated area in Brazil. Its cultivation has grown considerably in the last years, especially in southern Bahia due to the favorable edaphoclimatic conditions and as profitable alternative to cacao crop (LEMOS, 2014). The growing demand for fruits for fresh consumption, and especially for the agribusiness sector, has driven the expansion of the cultivated area, making the culture one of the main investment alternatives of the fruit sector of northeastern Brazil (COSTA et al, 2005; SAMARÃO et al, 2011). Due to its large area planted with cacao, southern Bahia has great potential to generate residues, and the cacao fruit shell is the main organic residue accumulated in crops, which when not properly reused, may be a source of inoculum for pathogenic fungi of cocoa culture (MORORÓ, 2012). Composting stands out among biological waste treatment processes by reducing their pollutant potential and converting them into organic compost capable of recycling nutrients in the soil (DOMÍNGUEZ; GÓMEZBRANDÓN, 2010)
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