Document Type : Research Paper
Authors
1
PhD student of Department of Forest Sciences and Engineering, Natural Resources Faculty, Sari Agricultural Sciences and Natural Resources University.
2
Sari Agricultural Science and Natural Resources Universitry
3
Assistant professor of Department of Forest Sciences and Engineering, Natural Resources Faculty, Sari Agricultural Sciences and Natural Resources University
4
professor of Department of Forest Sciences and Engineering, Natural Resources Faculty, Sari Agricultural Sciences and Natural Resources University
5
Assistant professor Soil and Water Research Department, Mazandaran Agricultural and Natural Resources Research and Education Center, AREEO, Sari, Iran
10.22034/ijf.2023.374195.1906
Abstract
In this research of ,20 treatments with three replications were used in a completely randomized design. The treatments used in this research included rice husk at 0.5% and 1% by volume, biochar of rice husk at 0.5%, 1%, and 2% by volume, cow manure at 0.75% and 1.25% by volume, chemical fertilizer at two levels: 1) triple superphosphate 0.6, for ammonium sulfate 0.45 and potassium sulfate 0.45, and 2) triple superphosphate 1.2, for ammonium sulfate 0.9 and potassium sulfate 0.9 g/kg soil, the soil treatment of the planting bed (control) and the combination of treatments. The nitrate of drainage water was measured by the spectrophotometric method in five steps. Statistical analysis was performed using R software and a comparison of means was performed using Duncan's test. According to the results in the first stage of sampling, the highest concentration of nitrate in drainage water was observed in the chemical fertilizer level 2, in the second and fourth stages, in the combination of chemical fertilizer level 1 and 0.75% cow manure by volume, and in the third stage in the treatment with 0.75% cow manure by volume. The highest pH value of the drainage water in the first stage of sampling was observed in the combination of chemical fertilizer level 1and 0.5% biochar. In the second and third sampling stages, control, however, showed the biggest one. In the fifth stage, the result was the same as the first stage. Also, the combination of chemical fertilizer level 1 and 0.75 percent cow manure caused an increase of 204, and 0.5% biochar caused a total decrease of 39.4 mg/liter of nitrate leaching. The results of this research showed that the application of biochar causes a decrease in electrical conductivity and nitrate concentration and an increase in the pH of drainage water.
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