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Excessive use of fertilizers causes environmental and ecological disruption of nature. Also, the waste of soluble fertilizers such as nitrogen fertilizers in paddy filed is another problem of using these fertilizers. In this study, zeolite clay mineral was used as a soil conditioner to increase CEC and maintain soluble materials in the cultivation medium of two varieties of Tarom Mazand and Shiroodi. This study was carried out in a completely randomized block design at the National Rice Research Institute, deputy of Mazandaran Province. The treatments involved in this project were, respectively: Z0: No use of chemical fertilizers and zeolite; Z1: Use of zeolite in an amount of one ton per hectar without the use of chemical fertilizers; Z2: Use of chemical fertilizers based on soil analysis results and technical advice of the Rice Research Institute for each variety; Z3: Z2 + Use of zeolite in an amount of 400 kg per hectare; Z4: Z2 + Use of zeolite in an amount of 600 kg per hectare; Z5: Z2 + Use of zeolite in an amount of one ton in the construction. Before transplanting and applying treatments, soil sampling was carried out in a composite manner from the field and physical and chemical properties were measured. Fertilizers were applied based on the results of soil analysis and the recommended technical values for both varieties. Agricultural operations such as weed, pest and disease control were carried out uniformly in all plots. To investigate the effect of different treatments, conventional yield component traits were measured. According to the results, the highest and lowest observed yield for Tarom Mazand was 4908 and 3751 kg/ha, respectively, which was observed in plots Z2 and Z0. Also, in the Shiroodi cultivar, the highest and lowest measured yields were 6665 and 4747 kg/ha, respectively, which, like the Tarom Mazand cultivar, were observed in treatments Z2 and Z0. In both cultivars, no statistically significant difference was observed between treatment Z1, which only received zeolite, and treatment Z0. Other treatments Z3, Z4 and Z5 also had no statistically significant difference with treatment Z2 or were in the lower group in both cultivars. Zeolite is a clay mineral with a high cation exchangeable capacity that may not have a direct effect on yield and yield components, but its use in sufficient quantities may increase the recovery efficiency of urea fertilizer.
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