Studies on relationship between total glomalin and soil aggregates in perennial fruit crop orchards
Publication Date : 23/07/2015
Glomalin is a glycoprotein produced by Arbuscular Mycorrrhizal (AM) fungi, which play an important role in soil aggregation. The presence of total glomalin was studied in different fruit crop orchards viz., Anona (Anona spuamosa), Guava (Psidium guajava), Mango (Mangifera indica) and Sapota (Manilkara achras (Mill) Forsberg) to understand the total glomalin in relation to soil aggregation in perennial fruit crop orchards. Soil samples were collected from inside and outside drip circle of plants and then graded into different aggregates by using various sieves viz., 2.0, 3.0 and 4.0 mm. All the samples were analysed for total glomalin content and AM fungal spores by adopting standard methods. The results indicated that the soils from outside drip circle had significantly higher total glomalin (6.20 - 9.42 mg g-1 soil) compared to the soils from inside drip circle (5.60 - 7.10 mg g-1 soil) in all the fruit crops orchards. This observation clearly indicated that the undisturbed fruit crop orchard soils contain 9.60% - 24.6 % higher total glomalin compared to inside drip circle of guava, mango and anona orchards. Among the different soil aggregates, the 3-4 mm size aggregates had significantly higher total glomalin compared to 2.0 mm soil aggregates, which clearly indicates the role of glomalin in soil aggregation process. The total AM fungal spores were observed to be significantly varies between different aggregates, but not much proportinate variation among different size of aggregates.
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