Nutrients availability by three types of sewage sludge addition
In order to evaluate the nutrients content to soil by the application of three different types of sewage sludge an experiment was carried out on rooted cv. Cornicabra olive Olea europaea L cuttings in a greenhouse with temperature and humidity controlled conditions. The substrate was sand plus a nutrient solution without nitrogen and plus different rates of three sewage sludge. PVC glasses of 0.25 l without drainage were used, they were filled with 250 g washed see sand of fine grain and different treatments of sewage sludge. The mixtures were homogenised. Three treatments were evaluated composted sewage sludge (LC), pruning residues + composted sewage sludge (RP+LC) and thermo-dehydrated sewage sludge (LDST). The rates studied were 0, 10, 20, 40, 80 and 120 t/ha. After three months of olive rooted cuttings cultivation, they were extracted of the substrate and we were made a physics-chemical analysis of dried and homogeneous substrate. The variables studied were percentage of total nitrogen (% NT), ammonium (MH4 +), nitrate (NO 3 -), phosphorus (P), potassium (K) and organic matter (% MO). The response of each variable and each treatment with different rates were modelized by regression analyse, all the cases reflected significant responses (p<0.05). Regarding the content of nitrogen the three sewage sludge compost increase linearly in terms of rates. The behaviour was as a fertilizer of slow mineralization of nitrogen. The ammonium content of LC increase linearly in terms of rates of sewage sludge, regarding RP+LC the increase was low and with the 40 t/ha rate begin to become stable, regarding LDST from 40 t/ha the increase were higher. Regarding LC the nitrate content from 20 t/ha were the highest in comparison with RP+LC and LDST treatments. This test indicates regarding LDST only the content of phosphorus and potassium were higher in terms of rates. Regarding the three sewage sludge compost the content of organic matter increase in terms of rates. In relation to nutrients availability, this test indicates that LDST is the best treatment followed by RP+LC treatment and finally LC treatment.
| Main Authors: | , , , , , , |
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| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Universidad Nacional Autónoma de México
2003
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| Subjects: | Composted sewage sludge, Pruning residues + composted sewage sludge, Thermodehydrated sewage sludge, Total nitrogen, Nammonium, Nnitrate, Phosphorus, Potassium, Organic matter, |
| Online Access: | http://hdl.handle.net/20.500.12792/2901 http://hdl.handle.net/10261/290786 |
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| Summary: | In order to evaluate the nutrients content to soil by the application of three different types of sewage sludge an experiment was carried out on rooted cv. Cornicabra olive Olea europaea L cuttings in a greenhouse with temperature and humidity controlled conditions. The substrate was sand plus a nutrient solution without nitrogen and plus different rates of three sewage sludge. PVC glasses of 0.25 l without drainage were used, they were filled with 250 g washed see sand of fine grain and different treatments of sewage sludge. The mixtures were homogenised. Three treatments were evaluated composted sewage sludge (LC), pruning residues + composted sewage sludge (RP+LC) and thermo-dehydrated sewage sludge (LDST). The rates studied were 0, 10, 20, 40, 80 and 120 t/ha. After three months of olive rooted cuttings cultivation, they were extracted of the substrate and we were made a physics-chemical analysis of dried and homogeneous substrate. The variables studied were percentage of total nitrogen (% NT), ammonium (MH4 +), nitrate (NO 3 -), phosphorus (P), potassium (K) and organic matter (% MO). The response of each variable and each treatment with different rates were modelized by regression analyse, all the cases reflected significant responses (p<0.05). Regarding the content of nitrogen the three sewage sludge compost increase linearly in terms of rates. The behaviour was as a fertilizer of slow mineralization of nitrogen. The ammonium content of LC increase linearly in terms of rates of sewage sludge, regarding RP+LC the increase was low and with the 40 t/ha rate begin to become stable, regarding LDST from 40 t/ha the increase were higher. Regarding LC the nitrate content from 20 t/ha were the highest in comparison with RP+LC and LDST treatments. This test indicates regarding LDST only the content of phosphorus and potassium were higher in terms of rates. Regarding the three sewage sludge compost the content of organic matter increase in terms of rates. In relation to nutrients availability, this test indicates that LDST is the best treatment followed by RP+LC treatment and finally LC treatment. |
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