Adani, F., Genevini, P. Zaccheo, P. and Zocchi G. (1998). The effect of commercial humic acid on tomato plant growth and mineral nutrition, J. Plant Nut. 21(31): 561-575.
Anonymous. (2014). Compost characteristics. http://composts
Arancon, N.Q., Edwards, C.A. Lee, S. and Byrne, R. (2006). Effects of humic acids from vermicomposts on plant growth. Eur. J. Soil Biol. 42, 65-69.
Arya, S., Toky, O.P. Tomar, R. Singh, L. and Hrris, P.J.C. (1993). Seasonal variation in auxin-induced rooting of Prosopis cineraria stem cuttings. The International Tree Crops J 7, 249.
Asing, J., Wong, N.C. and Lau, S. (2004). Preliminary method development of humic acid extraction. Proceedings SOILS 2004, Innovation in soil science for sustainable agriculture, 13–14 April. 2004, (Zin, Z.Z. et al., eds.) p. 72–75. Serdang: UPM.
Azam, F. and Malik, K.A. (1983). Effect of humic acid soaking of seeds on seedling growth of wheat (Triticum aestivum) under different conditions. Pakistan J. Bot. 15, 31-38.
Binner, E., Smidt, E. Tintner, J. Bohm, K. and Lechner, P. (2011). How to enhance humification during composting of separately collected biowaste: impact of feedstock and processing. Waste Manage. Res. 29, 1153-1163.
Bonner, F.T., McLemore, B.F. and Barnett, J.P. (1974). Presowing treatment of seed to speed germination, pp. 126-35 in ‘Seeds of Woody Plants in the United States’. Agric. Handbook No. 450 Forest Service, Washington, D.C.
Burt, R. (2004). Soil survey laboratory methods manual. United States Department of Agriculture, Natural Resources Conservation Service, Soil survey investigations report no 42, Version 4.0, Washington DC.
Carter, M.R. (2002) Soil Quality for Sustainable Land Management. Agron. J. 94, 38-47.
Cavanagh., A.K. (1980). A review of some aspects of the germination of acacias. Proceeding Royal Society of Victoria. 91(1–2), 161–80.
Chen, Y., De Nobili, M. and Aviad, T. (2004). Stimulatory effects of humic substances on plant growth. In Soil organic matter in sustainable agriculture. Magdoff F., Weil R. eds. (CRC Press, Boca Raton, FL, pp 131–165.
Crecchio, C., Curci, M. Mininni, R. Ricciuti, P. and Ruggiero, P. (2001). Short-term effects of municipal solid waste compost amendments on soil carbon and nitrogen content, some enzyme activities and genetic diversity. Biol. Fertil. Soils. 34:311-318.
Daldoum, D.M.A. and Ameeri, H.A. (2013). Growth performance of four acacia tree seedlings raised in silt soil amended with compost. JONARES 1, 23-28.
Debosz, K., Petersen, S.O. Kure, L.K. and Ambus, P. (2002). Evaluating effects of sewage sludge and house hold compost on soil physical, chemical and microbiological properties. Appl. Soil Ecol. 19:237-248.
EAD. (2009a). Soil survey of Abu Dhabi Emirate, vol I, Extensive survey. Environment Agency, Abu Dhabi, p xx+506.
EAD. (2009b). Soil survey of Abu Dhabi Emirate, vol III, Intensive survey. Environment Agency, Abu Dhabi, p xviii+435
Edwards, C.A., Lee, S. and Byrne, R. (2006). Effects of humic acids from vermicomposts on plant growth. Eur. J. Soil Biol. 46, 65-69.
Felbeck, G.T. (1965). Structural chemistry of soil humic substances. Adv. Agron. 17, 327-368.
GretagMacbeth. (2000). Munsell Soil Color Charts. 617 Little Britain, New Windsor, NY 12553.
Haider, K. and Martin, J.P. (1967). Synthesis and transformation of phenolic compounds by Epicoccum nigrum in relation to humic acid formation. Soil Sci. Soc. Am. Proc. 31, 766-772.
Haider, K., Martin, J.P. and Rietz, E. (1977). Decomposition in soil of 14C-labelled coumaryl alcohols; free and lined into dehydropolymers and plant lignins and model humic acids. Soil Sci. Soc. Am. J. 41, 556-562.
Hargreaves, J.C., Adl, M.S. and Warman, P.R.A. (2008). Review of the use of composted municipal solid waste in agriculture. Agr. Ecosystems Environ. 123:1-14.
Katkat, A.V., Celik, H. Turan, M.A. and Asik, B.B. (2009). Effects of soil and foliar applications of humic substances on dry weight and mineral nutrients uptake of wheat under calcareous soil conditions. Aust. J. Basic Appl. Sci. 3(2), 1266-1273.
Kelting, M., Harris, J.R. and Fanelli, J. (1998). Humate-based biostimulants affect early post-transplant root growth and sapflow of balled and burlapped red maple. Horticultural Sci. 33, 819-822.
Khang, V.T. (2011). Fulvic foliar ertilizer impact on growth of rice and radish at first stage. Omonrice 18:144-148
KISR. (1999). Soil survey for the state of Kuwait, vol II, Reconnaissance survey. AACM International, Adelaide
Ladd, J.N. and Butler, J.H.A. (1971). Inhibition and stimulation of proteolytic enzyme activities by soil humic acids. Aust. J. Soil Res. 7, 253-261.
Lee, Y.S. and Bartlett, R.J. (1976). Stimulation of plant growth by humic substances. Soil Sci. Soc. Am. J. 40, 876-879.
MAF. (1990). General soil map of the Sultanate of Oman. Ministry of Agriculture and Fisheries, Directorate General of Agricultural Research, Muscat
Malcolm, R.E. and Vaughan, D. (1979a). Comparative effects of soil organic matter fractions on phosphatase activities in wheat roots. Plant and Soil. 51, 117-126.
Malcolm, R.E. and Vaughan, D. (1979b). Effects of humic acid fractions on invertase activities in plant tissues. Soil Biol. Biochem. 11, 65-72.
Malik, K.A. and Azam, F. (1984). Effect of humic acid on wheat (Triticum aestivum L.) seedling growth. Environ. Experimental Bot. 25, 245-252.
Malik, S., Mann, S., Gupta, D., and Gupta, R.K. (2013). Nutraceutical Properties of Prosopis cineraria (L.) Druce Pods: A Component of “Panchkuta”. Pharmacognosy Phytochem. 2, 66-73.
Martin, J.P. and Haider, K. (1971). Microbial activity in relation to soil humus formation. Soil Sc. 111, 54-63.
MAW. (1985). General soil map of Kingdom of Saudi Arabia. Ministry of Agriculture and Water, Riyadh, Saudi Arabia
Mayhew, L. (2004). Humic substances in biological agricultural systems. Acres 34.
Merlol., R. Ghisil, N.R. and Passeral, C. (1991). Effects of humic substances on carbohydrate metabolism of maize leaves. Canadian J. Plant Sci. 71: 419-425.
MMAA. (2005). Soil classification and land use specifications for the State of Qatar. Phase IV: The atlas of soils for the State of Qatar. Ministry of Municipal Affairs and Agriculture, Qatar
Mohammadi, K., Ghalavand, A. Aghaalikhani, M. Heidari, G.R. Shahmoradi, B. and Sohrabi, Y. (2011). Effect of different methods of crop rotation and fertilization on canola traits and soil microbial activity. Aust. J. Crop Sci. 5:1261–1268.
Muscolo, A., Cutrupi, S. and Nardi, S. (1998). IAA detection in humic substances. Soil Biol. Biochem. 30, 1190-1201.
Nardi, S., Pizzeghello, D, Gessa, C. Ferrarese, L. Trainotti, L. and Casadoro, G. (2000). A low molecular weight humic fraction on nitrate uptake and protein synthesis in maize seedlings. Soil Biol. Biochem. 32, 415-419.
Omar, S.A.S. and Shahid, S.A. (2013). Reconnaissance soil survey for the State of Kuwait. Chapter 3, In: Developments in Soil Classification, Land Use Planning and Policy Implications-Innovative Thinking of Soil Inventory for Land Use Planning and Management of Land Resources (Shahid S.A. Taha, F.K. Abdelfattah, M.A. (eds). Pp. 85-107.
Patil, R. (2011). Effect of potassium humate and deproteinised Juice (DPJ) on seed germination and seedling growth of wheat and jowar. Annals Biol. Res. 2, 26-29.
Piccolo, A., Celano, G. and Pietramellara, G. (1993). Effects of fractions of coal-derived humic substances on seed germination and growth of seedlings (Lactuga sativa and Lycopersicum esculentum). Biology and Fertility of Soils 16, 11-15.
Piccolo, A., Pietramellara, G. and Mbagwu, J.D.C. (1997). Reduction in soil loss from erosion-susceptible soils amended with humic substances from oxidized coal. Soil Tech. 10, 235-245.
Rauthan, B.S., and Schnitzer, M. (1981). Effect of a soil fulvic acid on the growth and nutrient content of cucumber (Cucumis sativus). Plant and Soil. 63, 491-495.
Reynolds, A.G., Wardle, D.A. Drought, B. and Cantwell, R. (1995). Gro-Mate soil amendment improves growth of greenhouse-grown “Chardonnay” grapevines. Horticultural Sci. 30, 539-542.
Rivero, C. Chirenjeb, T. Ma, L.Q. and Martinez, G. (2004). Influence of compost on soil organic matter quality under tropical conditions. Geoderma. 123, 355-361.
Robertson, S., Narayanan, N. and Nargis, N.R.R. (2012). Toxicity evaluation on hydroalcoholic extract of leaf and stem bark of Prosopis cineraria. In. J. Pharmacy Pharmaceutical Sci. 4, 113-118.
Sanchez-Monedero, M.A., Paredes, R.A.C. and Bernal, M.P. (2001). Nirrogen transformation during composting by the Rutgers system and its effects on pH, EC and maturity of the composting mixtures. Bioresource Tech. 78, 301-308.
Scheibert, C. Stietiya, M.H. Sommer, J. Abdalla, O.E.S. Schramm, H. and Memah, Al. M. (2005). The atlas of soils for the State of Qatar. Ministry of Municipal Affairs and Agriculture, Doha.
Schnitzer, M. and Poapst, P.A. (1967). Effects of a soil humic compound on root initiation, Nature. 213, 598-599.
Shahid, S.A. (2014). The ICBA educational landscape design philosophy. Landscape, pp 30-33.
Shahid, S.A. Abdelfattah, M.A. Wilson, M.A. Kelley J.A. and Chiaretti, J.V. (eds). (2014). United Arab Emirates Keys to Soil Taxnomy. Springer pp. xxii+108.
Shahid, S.A. and Abdelfattah, M.A. (2008). Soils of Abu Dhabi Emirate. In: Perry RJ (ed) Terrestrial environment of Abu Dhabi Emirate. Environment Agency, Abu Dhabi, pp 71–91.
Smidova, M. (1962) Effect of sodium humate on swelling and germination of plant roots. Biol. Plant 4, 112-118.
Stamatiadis, S., Doran, J.W. and Kettler, T. (1999). Field and laboratory evaluation of soil quality changes resulting from injection of liquid sewage sludge. Appl. Soil Ecol. 12:263–272.
Tester, C.F. (1990). Organic amendment effects on physical and chemical properties of a sandy soil. Soil Sci. Soc. Am. J. 54, 827-83.
Trevisan, S., Francisco, O. Quaggiotti, S. and Nardi, S. (2010). Humic substances biological activity at the plant-soil interface - From environmental aspects to molecular factors. Plant Sig. Behave. 5, 635-643.
Vaughan, D. Malcom, R.E. (1985). Influence of humic substances on growth and physiological processes. In: Vaughan, D., Malcom, R.E.(Eds.), Soil Organic Matter and Biological Activity, Martinus Nijhoff/Junk W, Dordrecht, The Netherlands, pp. 37–76.
Vaughan, D., and Malcolm, R.E. (1979). Effect of soil organic matter on peroxidase activity of wheat roots. Soil Biol Biochem. 11, 57-63.
Vaughan, D., Linehan, D.J. (2004). The growth of wheat plants in humic acid soluyions under axi nic conditions. Plants and Soil. 44, 445-449
Wang, I.X.J., Wang, Z.Q. and Li, S.G. (1995). The effect of humic acids on the availability of phosphorus fertilizers in alkaline soils. Soil Use Manage. 11, 99-102.
Werner, M.R. (1997). Soil quality characteristics during conversion to organic orchard management. Appl. Soil Ecol. 5, 151-167.
Wortmann, C.S. Shapiro, C.A. (2008). The effects of manure application on soil aggregation. Nutr. Cycl. Agroecosyst. 80, 173–180.
Youngs, R.W. and Frost, C.M. (1963). Humic acids from leonardite, a soil conditioner and organic fertilizer. 967 American Chemical Society, Division of Fuel Chemistry 7: 12-17.
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