| Abstrakt: |
The field experiment was conducted in Al-Zubayr district, Al Raha area, Basra province, Iraq during season 2018 in order to know the effect of three types of conditioners (zeolite, rice straw ash and zeolite mixed with rice straw ash) and with three levels of addition (0, 5 and 10 tons.ha-1) on the availability of nutrients in soils irrigated with saline well water (16 dSi.m-1). Then adding the amendments to the soil with the surface layer and at three levels for each amendment (0, 5 and 10 tons.ha-1). The results showed that the addition of mineral and organic amendments led to a significant increase in the availability quantity of elements in the sandy loam irrigated with saline water. The excelled of the zeolite amendment and the zeolite amendment mixed with rice straw ash with a mixing percentage (50%) on the rice straw ash amendment in increasing the concentration of the necessary elements for the plant, which in turn was reflected on the total yield of tomato plants. The concentration of nutrients increased with the increase in the level of the added amendment. The level of 10 ton.ha-1 achieved the highest values of nitrogen, phosphorous and potassium amounting to 91.47, 43.31 and 234.61 mg.kg-1 soil respectively with a significant difference from the level 5 ton ha-1 and the level of 5 tons.ha-1 was excelled to the level 0 tons.ha-1 (the control treatment), followed by the treatment of zeolite amendment mixed with rice straw ash and the addition level of 10 tons.ha-1 was 96.67, 48.77 and 255.53 mg kg-1 soil. The results also showed that the zeolite treatment at the level of 5 tons.ha-1 was excelled on the treatment of zeolite mixed with rice straw ash 5 tons.ha-1, which amounted to 72.47, 34.05 and 189.73 mg.kg-1 soil respectively and rice straw ash (5 tons.ha-1) showed a significant increase in the concentration of available nutrients compared to the control treatment without the addition of the amendment. [ABSTRACT FROM AUTHOR] |
