Department of Horticultural Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Department of Soil Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Agricultural Research Center of Golestan Province, Gorgan, Iran
Department of Horticulture, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
Under favorable soil conditions such as existence of easily destructible organic compounds, balanced heat and moisture, adequate ventilation and abundant nutrients, organic materials are mineralized. Once mineralizing occurs, mineral elements like P, S, Ca, Mg, K and other cations are released. A related study was conducted to determine the effect of seven organic fertilizers (Leaf Mold (LM), Rice Husk (RH), manure, Spent Mushroom Compost (SMC), mixture of LM, RH and SMC (M1), mixture of LM, RH and manure (M2) with the ratio of 1: 1: 1 and control) at three levels of soil compactness (roller weight of 36, 56 and 76 kg) on N, P, K content of soil and aril parts of sport lawn. Treatments were applied as strip plot design in three replications, in research farm of Gorgan University of Agricultural Sciences and Natural Resources during 2008-2009. According to the results of this study, in all three compactness levels, treatments containing manure and SMC showed more N and K in contrast to control treatment. The most content of soil P in each compactness level was observed in plots fertilized with manure. The manure and control treatments showed the most and the least amount of plant nitrogen in all compactness treatments respectively. The manure and SMC treatments and also treatments containing these organic matters increased plant phosphorus content in compare with RH, LM and control treatments. Also in three compactness, manure and SMC treatments showed more plant potassium in contrast to control.