Document Type : Research Paper
Authors
1 MSc. Student, Department of Agronomy and Crops Breeding, College of Agricultural Sciences, Shahed University, Tehran – Iran
2 Professor, Department of Agronomy and Crops Breeding , College of Agriculture and Natural Resources, University of Tehran, Karaj – Iran
3 Professor, Department of Agronomy and Crop Breeding , College of Agriculture and Natural Resources, University of Tehran, Karaj – Iran.
Abstract
To evaluate the effects of fertilizing and deficit irrigation regimes on some chemical properties of soil and plant, an experiment was conducted during 2007 and 2008 growing seasons. Experimental design was a split plot based on a randomized complete block design with four replications. The treatments consisted of three deficit irrigation regimes (main plots) and six soil fertilizing systems (sub-plots). The irrigation treatments were included non-stressed, medium stress and severe stress. Fertilizing systems consisted of no fertilizing as control, phosphorous and nitrogen biofertilizers, 100% chemical fertilizer, vermicompost, 50% chemical fertilizer + 50% vermicompost, and 50% chemical fertilizer + biofertilizer as the sub plots. Integrated application of chemical and organic fertilizers increased soil P more than the other fertilizing systems. Integrated fertilizers increased plant N in compare with other fertilizing systems. Fertilizers containing vermicompost had more soil organic carbon, nitrogen and phosphorus or plant N and P under water stress rather than the others. Biofertilizer increased soil and plant P content under normal irrigation.
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