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Utilization of labeled isotopes to evaluate the conditions of using the sewage sludge and manure for fertilization of oats

By Mihai Dumitru, Eugenia Gamenţ, D.M. Motelică, Nicoleta Vrînceanu and Ioana Prodan


The experiments have been organized with Phaeozems in the Teleorman Research-Development Agricultural Station and included treatments with urban sludge and manure at rates equivalents of 0; 100; 200; 300 and 400 kg N/ha and mineral fertilizers (N100). To evaluate the amounts of nitrogen derived from residual products of the achieved nitrogen balance, an experiment was treated with 15N at a rate of 20 kg N/ha coming from ammonium sulphate (15N. 10% atom excess). The experiment was built up according to the method of randomized blocks with three replicates. On average, the characteristics of residual products used in experiments are as follows: - Manure: pH – 8.93, N – 1.66%, C – 16.8%, P – 0.54%, K – 1.96%, Na- 0.12%, Ca – 0.48%, Mg – 0.77%, organic matter – 41.9%, Cu – 18.0 mg/kg, Zn – 58.5 mg/kg, Pb – 27.4 mg/kg, Ca – 12.5 mg/kg, Ni – 31.9 mg/kg, Mn – 5.61 mg/kg, Cd – 1.44 mg/kg. - Urban sludge: pH – 6.76, N – 3.68%, C – 27.8%, P – 0.79%, K – 0.85%, Na - 0.06%, Ca – 2.09%, Mg – 0.28%, organic matter – 64.4%, Cu – 102 mg/kg, Zn – 505 mg/kg, Pb – 90 mg/kg, Co – 9.7 mg/kg, Ni –41.8 mg/kg, Mn – 406 mg/kg, Cd –2.94 mg/kg. Mineral fertilization ensured a yield increase of 8%, while manure fertilization led to yield increases of 18- 35% (depending on rate), while the sludge fertilization to 13-46%. The organic fertilization led to the soil content increase in organic carbon, total nitrogen, mobile phosphorus and potassium. The paper presents data regarding the content of nitrogen, phosphorus, potassium, calcium, magnesium and heavy metals (Cu, Zn, Pb, Co, Ni, Mn and Cd) in stems, leaves and grains of oats. Indices of nitrogen uptake from sewage sludge and manure are similar. So, the nitrogen in the oats straw, coming from the sewage sludge varied between 12.0 and 41%, and that coming from the manure varied between 18.1 and 44.6%. The nitrogen in the oats grains, derived from the urban sludge, reached values between 12.7 and 28.2%, and that coming from manure reached values between 2.8 and 38 %. Overall, the nitrogen derived from the sewage sludge varied between 12.4 and 32.3%, and that derived from the manure varied between 8.7% and 40.5%. The recovering degree of nitrogen in urban sludge varied between 10.0% and 13.5%, and that from manure varied between 9.5 and 16.8%

Topics: Organic carbon, total nitrogen, mobile phosphorus and potassium, heavy metals, LCC:Plant culture, LCC:SB1-1110, LCC:Agriculture, LCC:S, DOAJ:Plant Sciences, DOAJ:Agriculture and Food Sciences
Publisher: Research Institute for Fruit Growing Pitesti
Year: 2008
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