Document Type : Research Paper
Authors
1 Associate Professor, West Azarbaijan Agricultural and Natural Resources Research Center, AREEO, Urmia, Iran
2 Professor, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
Abstract
Floods water contain sediments that affect the fertility of coarse grain alluvial fan and flood plains after deposition, through increasing their nutrients. In this study, the effects of flood spreading were investigated on the recovery of soil nutrients at the Poldasht flood spreading station of west Azerbaijan during 10 years., The first three bands that have been flooded, were selected at the flood spreading channels. In each strip, six soil samples of of 0-20 cm depths, were taken and total nitrogen, phosphorus, potassium, and soil organic carbon were measured. For statistical analysis, t-test non-parametric tests were used where the data had normall distribution or not, respectively; . According to the results, the amount of soil organic carbon and total nitrogen increased from 0.23 to 0.33 and 0.027 to 0.039 percent, respectively during the implementation years. Exchangeable phosphorus and potassium were significantly increased from 2.69 to 5.32 and 145.93 to 206.52 parts per million, respectively. On the other hand, there was a significant difference for some factors of the spreading bands at 5% probability. Amounts of phosphorus, soil organic carbon and nitrogen in the upper strips were significantly more than lower bands. However, there was no significant change on the amount of potassium. The results showed that the flood spreading increased soil nutrients which reduce the fertilizers application.
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