A. Mirbolook; A. Lakziyan; Gh. Haghnia
Abstract
Abstract
Some species of earthworms have great ability to breakdown the organic wastes and transform them to vermicompost. It is very important to optimize the growth conditions and earthworms reproduction to achieve high efficiency in vermicompost production. In this study the effect of aeration, soil ...
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Abstract
Some species of earthworms have great ability to breakdown the organic wastes and transform them to vermicompost. It is very important to optimize the growth conditions and earthworms reproduction to achieve high efficiency in vermicompost production. In this study the effect of aeration, soil and sugar beet molasses on the number of adult and juvenile worms, cocoons and earthworm biomass were studied in a completely randomized design with 8 treatments. Sugar beet molass had the highest influence on the number of adult and juvenile earthworms, cocoon and biomass. Aeration had a significant effect on the number of juvenile worms, cocoons, and earthworm biomass, although it had negative effect on adult worms. Treatments with soil increased the number of cocoons and biomass significantly, however, had no significant effect on the number of adult and juvenile earthworms. The highest amount of earthworm biomass was obtained during the seventh and eighth weeks of experiment and decreased afterwards. The earthworm growth rate in treatments with sugar beet molass was much higher than control.
Key words: Earthworm, biomass, growth rate, sugar beet, molass, vermicompost
A. Hosseinipour; Gh. Haghnia; A. Alizadeh; A. Fotovat
Abstract
Abstract
Due to the necessity of wastewater reuse in arid regions and the necessity of investigation on the fate of added materials into the soil, a greenhouse experiment was carried out with polyethylene columns (150 cm in length and 11 cm in diameter) filled with a sandy loam soil during 7 periods ...
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Abstract
Due to the necessity of wastewater reuse in arid regions and the necessity of investigation on the fate of added materials into the soil, a greenhouse experiment was carried out with polyethylene columns (150 cm in length and 11 cm in diameter) filled with a sandy loam soil during 7 periods of 15 days. A statistical factorial design was used. Raw and treated wastewaters from Parkandabad treatment plant were applied to the columns under continuous and intermittent flood irrigations. The results showed that PO4-P and Cd were retained by the soil while a large portion of soluble cations and anions, NO3-N and TOC as well as a part of Ni were leached out. The type of wastewater had a significant effect on transport percentage of elements except K and Mg. The transport percentage of all elements (with the exception of NO3-N and PO4-P) was higher for treated as compared to raw wastewater. Ca, HCO3 and Ni were significantly affected by the mode of application. For the intermittent flood conditions more Ca was leached out, while a reverse case was observed for the other two elements. Due to relatively rapid leaching of soluble cations especially Ca and Mg, NO3-N and TOC from the soil, and also high amount of heavy metals and TOC in raw wastewater, disposal of wastewaters (especially raw wastewater) should be managed carefully.
Key words: Column study, Raw and treated wastewater, Continuous flooding, Intermittent flooding,Transport perecentage
N. Ghorbanzadeh; Gh. Haghnia; A. Lakziyan; A. Fotovat
Abstract
Abstract
Blood meal contains large amount of nitrogen and iron that can be supplied to plants instead of chemical fertilizers. Nitrogen is the most important nutrient for corn plant. The main objective of this study was to determine the capability of blood meal to release nitrogen and iron and its consequence ...
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Abstract
Blood meal contains large amount of nitrogen and iron that can be supplied to plants instead of chemical fertilizers. Nitrogen is the most important nutrient for corn plant. The main objective of this study was to determine the capability of blood meal to release nitrogen and iron and its consequence effect on corn growth. An experiment under laboratory and greenhouse conditions was conducted in the form of a completely randomized design with 6 treatments and 3 replications. The treatments included 3 levels of blood meal (1.5, 3 and 6 ton/h), urea fertilizer (200 kg/h), Fe EDDHA (5 kg/h), and the control. The results of soil incubation demonstrated that release of iron from blood meal was similar to Fe EDDHA and the amount of iron reached to its highest level after 30 days of adding to the soil. Nitrogen was released from all levels of blood meal slower than urea, and the amount of inorganic nitrogen in blood meal was less than urea. The results of corn growth showed that the application of blood meal one month before planting could provide the needed nitrogen and iron and have a positive effect on its growth.
Key words: Blood meal, Nitrogen, Iron, Corn
