The Effect of Adding Rice Husk and Zeolite on Some of the Soil Properties at Different Times

Although the use of fertilizer in poor soils is essential for increasing soil fertility and optimal growth of plant, but in recent years, chemical fertilizers have caused a lot of environmental damages. Thus, this study was conducted to investigate the effect of organic matter (Rice Husk) and mineral modifiers (Clinoptilolite Zeolite) on some soil properties. For this purpose, an experiment was performed in 2020 in the greenhouse faculty of the agricultural and natural resources of lorestan university. Test treatments include: 1- organic modifiers with three level (1, 3, 5 wool weight) and mineral modifiers with three level (3, 5, 10 wool weight) and control treatment 2- three different incubation time (30 as control, 60, 90 days). Before starting the proposed times, one month incubation was applied to the soil to adjust the soil material. The result showed that the use of both modifiers increased average weight of the aggregate diameter, porosity, weight moisture, electrical conductivity, total nitrogen, acidity, carbon ratio to nitrogen and microbial respiration compared to the control. The average weight of aggregate diameter increased by 26.7% compared to the control. But, the amount of bulk density and the hydrophobicity of the samples were decreased as compared to the control treatment. 10% weight of zeolite and 3% weight of rice shell treatment reduced hydrophobicity by about 37.8% compared to the control. Over time, the amount of bulk density, porosity, electrical conductivity, organic carbon, total nitrogen and microbial respiration showed a reduction trend, but the soil acidity and carbon ratio to nitrogen had an increasing trend. The carbon/nitrogen ratio during the incubation period of 60 and 90 days, significantly increased by 7.04 and 17.32% compared to the control. The result of data analysis showed that the effect of time on hydrophobic and average weight of the aggregate diameter and weight moisture was not significant.