1. Allison, F.E., 1973. Soil Organic Matter and its Role in Crop Production. Elsevier, Amsterdam.
2. The ecological role of biodiversity in agroecosystems;Altieri;Agric. Ecosyst. Environ.,1999
3. Andrews, P.K., Glover, J.D., Reganold, J.P., 2001. Horticultural performance, soil quality, and orchard profitability of integrated, organic, and conventional apple production systems. In: Proceedings of the Integrated Fruit Production. IOBC/WPRS Bull. 24 (5), 393–400.
4. Soil nutrients and microbial biomass following weed-control treatments in a Christmas tree plantation;Arthur;Soil Sci. Soc. Am. J.,1999
5. Improving the growth of newly planted apple trees;Autio;HortScience,1991