Effects of different levels of fertilizer and Superabsorbent on nitrate leaching

Amirian, M. (2013) Effects of different levels of fertilizer and Superabsorbent on nitrate leaching. Masters thesis, University of Zabol.

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Increasing agricultural efficiency through the reduction factors of production is a concern for researchers. Fertilizers types are an important factor in production of agricultural product. The use of nitrogen fertilizers is higher than other fertilizers in modern agriculture. Should be considered that excessive fertilization can caused by to salinity and accumulation of salts in soil. According to importance of the fertilizer leaching reduction and the losses, the objective of this study was to assess the effect of different levels of urea fertilizer and superabsorbent on nitrate leaching. For this purpose, water and plant samples were collected and were measured of EC, pH and nitrate concentration. To determine nitrate concentration in soil, samples were collected from 0-20 and 20-40 cm depths in all treatments. Then data was analyzed by SAS. The results showed that using different levels of superabsorbent did not significantly affect on soil and water nitrate and also on pH and EC of drainage water. Also addition of superabsorbent caused increase of osmotic potential and accumulation of salts in soil. Therefore nitrate uptake by plants was reduced. In general it can be said that due to high speed of nitrate leaching and rapid transfer of nitrate ions caused by anion desorption process, the superabsorbent cannot reduce nitrate leaching. On the other hand, it was found that increasing of urea fertilizer application would increase water and soil nitrate. The results indicated that more nitrates have been stored in the 20-40 cm soil layer than 0-20 cm due to capillary rise of water from deeper layers.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Nitrate, Leaching, Superabsorbent, Fertilizer, Urea
Subjects: S Agriculture > S Agriculture (General)
Depositing User: admin admin1 admin2
Date Deposited: 26 Apr 2016 07:00
Last Modified: 26 Apr 2016 07:00
URI: http://eprints.uoz.ac.ir/id/eprint/526

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