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Distribution and management of total and available sulfur under durian orchard soils in the Eastern Thailand
Author(s)
Date Issued
September 1, 2021
Type
Article
Abstract
Sulfur is necessary plant nutrient but is rarely determined on a routine basis because of interpretive and analytical problems resulted in the lack of consistent identification of S sufficiency or deficiency in soils. Sulfur status of durian orchard soils in the Eastern Thailand was evaluated for plant availability. The result indicated that total S ranged from 315 to 1340 mg/kg (average 813 mg/kg) which 93-99% was in organic form and relatively the same comparison between topsoil and subsoil. Total S was significantly correlated with C (r = 0.41**), N (r = 0.36**), pH (r = -0.52**) and SOM (r = 0.51**). The C:S and N:S ratios varied from 7.8-54.8 and 0.74-4.67 respectively, indicating the dominance of the mineralization process toward sulfur nutrition. C:N:S was 20:2:1 due to heavy S fertilizer application. Extractable S (available S) was varied from high to very high ranged depending on soil standard, of which about 75% of soil samples were classified to be no response to S application. Out of the average available S of 24.2 mg/kg the topsoil (28.2 mg/kg) was higher than subsoil (25.6 mg/kg). Available S showed very closely correlation to total S (r = 0.72**), C (r = 0.61**), N (r = 0.57**), pH (r = -0.29**) and SOM (r = 0.61**). Stepwise multiple regression showed that approximately 73.0% variation in the extractable or available S could be explained in terms of several soil parameters.
Citation
International Journal of Agricultural Technology, 17(5), 1767-1778, 2021