References

Ahmed, M., A. Idris and S.R.S. Omar, 2007. Physicochemical characterization of compost of the industrial tannery sludge. J. Eng. Sci. Technol., 2: 81-94.
Direct Link  |  

Ahmed, O.H., M.H. Husni, A.R. Anuar and M.M. Hanafi, 2005. Effects of extraction and fractionation time on the yield of compost humic acids. New Zealand J. Crop Hortic. Sci., 33: 107-110.
CrossRef  |  

Ahmed, O.H., M.H.A. Husni, A.R. Anuar and M.M. Hanafi, 2005. Determination of minimal duration necessary for the isolation of humic acid contained in composted pineapple leaves. Fruits, 60: 115-120.
CrossRef  |  

Ahmed, O.H., M.H.A. Husni, A.R. Anuar, M.M. Hanafi and E.D.S. Angela, 2004. A modified way of producing humic acid from composted pineapple leaves. J. Sustainable Agric., 25: 129-139.
CrossRef  |  

Aiken, G.G., D.M. McKnight, R.L. Wershaw and P. MacCarty, 1985. An Introduction to Humic Substances in Soil, Sediment and Water. In: Humic Substances in Soil, Sediment and Water, Aiken, G.R. and D.M. Mcknight (Eds.). John Wiley and Sons, New York, pp: 1-8.

Al-Bataina, B.B., T.M. Young and E. Ranieri, 2016. Effects of compost age on the release of nutrients. Intl. Soil Water Conserv. Res., 4: 230-236.
CrossRef  |  Direct Link  |  

Ameen, A., J. Ahmad and S. Raza, 2016. Determination of total organic matter of mature compost prepared by using municipal solid waste. Intl. J. Sci. Res. Publ., 6: 293-295.
Direct Link  |  

Anonymous, 2017. Compost analysis report. Agricultural Analytical Services Laboratory, Pennsylvania State University, Pennsylvania, USA. http://www.earthcarefarm.com/uploads/4/7/2/2/47226843/c09652.pdf

Bernal, M.P., J.A. Albuquerque and R. Moral, 2008. Composting of animal manures and chemical criteria for compost maturity assessment: A review. Bioresour. Technol., 100: 5444-5453.
CrossRef  |  

Ch'ng, H.Y., O.H. Ahmed and N.M.A. Majid, 2015. Improving phosphorus availability, nutrient uptake and dry matter production of Zea mays L. on a tropical acid soil using poultry manure biochar and pineapple leaves compost. Exp. Agric., 52: 447-465.
CrossRef  |  Direct Link  |  

Ch'ng, H.Y., O.H. Ahmed, S. Kassim and N.M. Ab Majid, 2013. Co-composting of pineapple leaves and chicken manure slurry. Int. J. Recycl. Org. Waste Agric., 2: 1-8.
CrossRef  |  Direct Link  |  

Chen, Y., N. Senesi and M. Schnitzer, 1977. Information provided on humic substances by E4/E6 ratios. Soil Sci. Soc. Am. J., 41: 352-358.
Direct Link  |  

Demir, Z. and C. Gulser, 2015. Effects of rice husk compost application on soil quality parameters in greenhouse conditions. Eurasian J. Soil Sci., 4: 185-190.
Direct Link  |  

DiDonato, N., H. Chen, D. Waggoner and P.G. Hatcher, 2016. Potential origin and formation for molecular components of humic acids in soils. Geochim. et Cosmochim. Acta, 178: 210-222.
Direct Link  |  

Dong, L., A.L. Cordova-Kreylos, J. Yang, H. Yuana and K.M. Scow, 2012. Humic acids buffer the effects of urea on soil ammonia oxidizers and potential nitrification. Soil Boil. Biochem., 41: 1612-1621.
CrossRef  |  PubMed  |  Direct Link  |  

Dong, L.H., J.S. Yang, H.L. Yuan, E.T. Wang and W.X. Chen, 2008. Chemical characteristics and influences of two fractions of Chinese lignite humic acids on urease. Eur. J. Soil Biol., 44: 166-171.
CrossRef  |  Direct Link  |  

Forjan, R., A. Rodriguez-Vila, B. Cerqueira and E.F. Covelo, 2017. Comparison of the effects of compost versus compost and biochar on the recovery of a mine soil by improving the nutrient content. J. Geochem. Explor., 183: 46-57.
Direct Link  |  

Gracia, D., J. Cegarra, M.P. Bernal, A. Navarro, 1993. Comparative evaluation of methods employing alkali and sodium pyrophosphate to extract humic substances from peat. Commun. Soil Sci. Plant Anal., 24: 1481-1494.
CrossRef  |  

Hanisah, M.R.N., O.H. Ahmed, K. Susilawati, N.M.A. Majid and M.B. Jalloh, 2008. Determination of minimal duration essential for isolation of humic acids from soils in forest restoration programmes. Am. J. Agric. Biol. Sci., 3: 597-601.
CrossRef  |  Direct Link  |  

Inbar, Y., Y. Chen and Y. Hadar, 1990. Humic substances formed during the composting of organic matter. Soil Sci. Am. J., 54: 1316-1323.
Direct Link  |  

Khater, E.S.G., 2015. Some physical and chemical properties of compost. Int. J. Waste Resour., 5: 1-5.
CrossRef  |  Direct Link  |  

Klavins, M. and O. Purmalis, 2013. Properties and structure of raised bog peat humic acids. J. Mol. Struct., 1050: 103-113.
CrossRef  |  Direct Link  |  

Murphy, J. and J.P. Riley, 1962. A modified single solution method for the determination of phosphate in natural waters. Anal. Chim. Acta, 27: 31-36.
CrossRef  |  Direct Link  |  

Palanivell, P., K. Susilawati, O.H. Ahmed and A.N. Muhamad, 2012. Effects of extraction period on yield of rice straw compost humic acids. Afr. J. Biotechnol., 11: 4530-4536.
Direct Link  |  

Palanivell, P., K. Susilawati, O.H. Ahmed and N.M. Majid, 2013. Compost and crude humic substances produced from selected wastes and their effects on Zea mays L. nutrient uptake and growth. Sci. World J., 2013: 1-15.
PubMed  |  Direct Link  |  

Peech, M., 1965. Hydrogen-Ion Activity. In: Methods of Soil Analysis Chemical and Microbiological Properties, Black, C.A., D.D. Evans, L.E. Ensminger, J.L. White, F.E. Clark and R.D. Dinauer (Eds.). American Society of Agronomy, Madison, WI., USA., ISBN-10: 0891180729, pp: 914-925.

Pena-Mendez, E.M., J. Havel and J. Patocka, 2005. Humic substances-compounds of still unknown structure: Applications in agriculture, industry, environment and biomedicine. J. Appl. Biomed, 3: 13-24.

Prabhas, C.T., P. Apurva and K.S. Shailendra, 2011. Comparative study of characteristics of biocompost produced by millipedes and earthworms. Adv. Appl. Sci. Res., 2: 94-98.
Direct Link  |  

Raposo, J.C., U. Villanueva, M. Olivares and J.M. Madariaga, 2016. Determination of humic substances in sediments by focused ultrasound extraction and ultraviolet visible spectroscopy. Microchem. J., 128: 26-33.
Direct Link  |  

Robert, E.P., 2014. Organic matter, humus, humate, humic acid, fulvic acid and humin: Their importance in soil fertility and plant health. Intl. Geosci Remote Sens. Soc., 1: 1-5.

Rosliza, S., O.H. Ahmed, K. Susilawati, N.M.A. Majid and M.B. Jalloh, 2009. Simple and rapid method of isolating humic acids from tropical peat soils (saprists). Am. J. Applied Sci., 6: 820-823.
CrossRef  |  Direct Link  |  

Senesi, N., T.M. Miano and G. Brunetti, 1996. Humic-Like Substances in Organic Amendments and Effects on Native Soil Humic Substances. In: Humic Substances in Terrestrial Ecosystems, Piccolo, A. (Ed.). Elsevier, UK., pp: 531-593.

Stevenson, F.J., 1994. Humus Chemistry, Genesis, Composition, Reactions. John Wiley and Sons, New York.

Stoffella, P.J. and B.A. Kahn, 2001. Compost Utilization in Horticultural Cropping Systems. 1st Edn., CRC Press, Boca Raton, Florida, USA., ISBN:9781420026221, Pages: 432.

Tan, K.H., 2000. Environmental Soil Science. 2nd Edn., CRC Press, Boca Raton, FL., Pages: 452.

Tan, K.H., 2003. Humic Matter in Soil and the Environment: Principles and Controversies. CRC Press, New York, USA., ISBN: 9780203912546, Pages: 408.

Tan, K.H., 2003. Soil Sampling, Preparation and Analysis. Taylor and Francis, New York, USA.

Tan, K.H., 2011. Principles of Soil Chemistry. 4th Edn., CRC Press, Boca Raton, Florida, USA., ISBN:9781439813959, Pages: 390.

Yusop, K., N.M.A. Majid, O.H. Ahmed and S. Kasim, 2007. Effects of extraction and fractionation period on the yield of a tropical peat soil (Hemists) humic acids. Am. J. Agric. Biol. Sci., 2: 202-205.
CrossRef  |  Direct Link  |