نوع مقاله : مقاله پژوهشی
نویسندگان
1 دکتری خاکشناسی از دانشگاه تربیت مدرس
2 استادیار خاکشناسی دانشگاه تربیت مدرس
3 استادیار پژوهشی موسسه تحقیقات خاک و آب
4 استاد خاکشناسی دانشگاه تربیت مدرس
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The continuous use of agricultural machinery in the field results in soil compaction with many long term effects on the physical and chemical properties of the soil and in the case of improper field management may alter and deteriorate soil physical properties. For example the alteration of root depth that results from soil compaction influences water and nutrient uptake as well as the amount of energy and fertilizer used in crop production and eventually affects the environmental conditions, soil fertility and economic returns because soil compaction reduces nutrient uptake and hence decreases plant yields. Biological methods that employ symbiotic fungi (arbuscular mycorrhizae, AM) may be considered to reduce the stressful effects of soil compaction on plant growth. Based on these considerations two years of field experiments were conducted using different species of arbuscular mycorrhiza to reduce the effects of soil compaction on corn nutrient uptake and yield. The experiments were conducted in the research field of Soil and Water Research Institute in Meshkin-Dasht, Karaj using three levels of compaction (in the first year) and three species of arbuscular mycorrhiza in four replicates. In the second year, with regard to the first year’s results, an extra level of compaction was added. Using a penetrometer, soil resistance for different soil compaction treatments at certain soil moistures was measured. Soil bulk density was also measured. Corn height, leaf fresh and dry weights and corn yield as well as concentrations of N, P, K, Fe, Mn, Zn and Cu in corn leaf were measured. The results demonstrated that compaction treatments were significantly different. AM treatments significantly increased corn growth parameters and yield. In AM treatments nutrient uptake increased at different levels of soil compaction, though the effectiveness of AM decreased with increasing compaction. It may be concluded that, through increasing nutrient uptake, AM decreases the stressful effects of soil compaction on corn growth resulting in increased corn yield, and this
کلیدواژهها [English]