Vol. 4, Issue 3 (2019)
Sulfur-aided acidification of compost ameliorates its negative effects and maximize phosphorous availability in calcareous soils
Author(s): Ayesha Irum, Saleem Akhtar, Muhammad Zafar Iqbal, Shahid Nazir
Abstract: Nutrient solubility, mobility and availability in the soil is mainly controlled by pH which effects the crop growth and yield. High buffering capacity (pH) of the compost limits its use as amendment for calcareous soils. The objective of the current study was to ameliorate the negative effects of high pH compost using elemental sulphur for maximizing its suitability for calcareous soils. Preliminary, in lab experiment, an intended rate of elemental sulphur from four rates i.e. 0, 0.4, 0.45, 0.50 % w/w of compost was selected to manipulate the pH of compost. Acidity of compost was regularly monitored and recorded on three weeks interval using 1:10 compost: water ratio. In a pot experiment suitability of acidified compost was evaluated on mung bean plants. Acidified amendment was applied @ 2% w/w. Results indicated that soil amended with acidified compost significantly improved the growth, yield and quality of mung bean compared to un-amended soil (control). Application of sulphur effected compost significantly increased the acidity in rhizosphere as well as bulk soil compared to un-amended control. Moreover, soil amended with acidified compost significantly improved the Olsen P i.e. 9 mg kg-1 compared to un-amended control. Therefore, it may be concluded that bio augmentation of alkaline compost with powdered sulphur may enhance its effectiveness for high pH calcareous soils.