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| Methods | Dosage | Results | References |
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| Randomly sampling on peat soil (soil analysis) | @700 g mixed with the liquid waste of palm oil | There was a change in composition for the pH value and mineral content of the peat soil after the application of POME with a pH value of 6.20, C-organic 2.38%, N-total 0.28%, phosphorus 63.34 ppm, Calcium 2.40 cmol/kg, magnesium 1.37 cmol kg−1, potassium 1.06 cmol kg−1, and CEC 9.47 cmol kg−1. | [67] |
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| Biopore (palm oil mill effluent from an aerobic pool) | 5; 7.5; and 10 liters of liquid waste of palm oil are provided in 1, 2, 3, and 4 biopore/plant holes, respectively | The application of POME dose of 7.5 liters in four biopores/plant holes increased the number of midribs and leaves, leaf width and length compared to the control and the highest form of other treatments. | [98] |
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| Mulching with the size of 1.2 × 1.4 m with plant spacing 60,70 cm. | 100, 200, and 300 ml per plan Mixed crops with palm ash | The interaction of POME and ash significantly affected plant height and weight of fruit/plant with the best dose of giving POME 300 ml with a fruit weight of 670 g per plant. | [99] |
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| Mulching plot size 4 × 4 m with a spacing of 20 × 40 cm) | 25000, 50000, 75000, 100000, and 150000 L/ha | Applying 150000 L ha−1 POME can replace dolomite lime, manure, urea fertilizer, and KCl in improving the chemical properties of ultisol soil for soybean production. | [97] |
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