مطالعه اثر فرسايش خاك بر توان توليد يا ارزيابي محصول عدس در منطقه قزوين و تاثير كوددهي در كنترل آن

Effect of Erosion on Soil Productivity as Regards Lentil Yield in Qazvin Area and the Role of Fertilizers as Control

To study the effects of soil erosion and fertilization on lentil (Lens culinaris) yield, an experiment with a split plot factorial design was employed . Simulated erosion treatments were 0 (blank), 5 , 10, 15, and 20 cm of depth. Fertilizer treatments were 0, 30, and 60 kg/ha of urea and 0, 60, and 120 kglha of triple superphosphate. Lentil seeds were planted in March 2001 and during the growing season , three supplementary irrigations (each 13 mm) were applied. The crop was harvested in July 2001, number of plants per m2 and pods per plant being counted. After drying, the samples were threshed and weighted for dry matter, grain, chaff, and 1000 grain weight. Data analysis showed that all erosion treatments as compared with blank had significant effect on determined parameters (The former four parameters at 1% while the latter at 5% probability). Urea and Cripple superphosphate treatments did not show any significant effect on yield increase or reduction in erosion effects. In this experiment in spite of significant effects, the real negative role of soil erosion on yield was not accurately determined because of: presence of water stress due to precipitation deficiency during the time of investigation, deep soils of the region, soil erosion occurring in the past, as well as lentil plant contentment.