جستجوی مقالات مرتبط با کلیدواژه « Sewage sludge compost » در نشریات گروه « اکولوژی »

Recent trends in land use and the effects of climate change resulted in the decline of organic matter content of the soils. Since crop management systems play an important role in soil carbon sequestration, therefore our aim was to determine the long-term effects of different organic fertilizers on soil respiration and its driving factors. The research work was carried out in two long-term experiments on sandy soil. The field and laboratory measurements of soil respiration were done in fallow, farmyard manure, farmyard manure + fertilizer, green manure and in sewage sludge compost (18 and 27 t ha-1) treatments. In addition, soil physical-chemical parameters were measured for complex evaluation. The results of laboratory and field soil respiration measurements were usually consistent with each other. The most intensive soil respiration was measured in sewage sludge compost treatments and in farmyard manure with NPK. In these treatments, the organic matter input and the positive changes in the physical and chemical properties of sandy soil stimulated the soil life, which resulted in more intensive soil respiration and enzyme activities. According to the results of correlation analysis the soil respiration was significantly influenced by the organic matter content, pH and moisture content of the soil. This study indicated the importance of replenishing the soil with organic matter, which can contribute to the maintenance of soil quality. In addition, the application of sewage sludge compost can be well utilized in agriculture for nutrient supply and improving carbon sequestration of sandy soil.

The large part of sandy soils in Hungary has unfavorable water management properties. Studies have shown that the sewage sludge compost, due to its high organic content, is suitable for improving structure and water management of these soils. The aim of our study was to determine the effects of the application of sewage sludge compost on physical properties of sandy soil.
The experiment was established in 2003 at the Research Institute of Nyíregyháza of the University of Debrecen in Hungary to study the utilization of sewage sludge compost in agriculture. In this study, however, the changes of water retention and erodibility of soil were measured for three periods. The soil type of the experiment is Arenosol (Dystric Lamellic Arenosol). The applied compost contained sewage sludge of 40%, straw of 25%, bentonite of 5% and rhyolite of 30%. The compost is applied every 3rd year in the following amounts: 0, 9, 18 and 27 Mg ha-1 of dry matter.
The compost treatment had a beneficial effect on soil structure thereby reducing the runoff and sediment loss under high intensity rainfall (130 mm h-1). However, in the control plot there was significantly higher water erosion. The water retention of soil was slightly increased after compost application.
The compost application improved the water management properties of sandy soil, which is connected with organic matter addition into soil. The compost treatment had a beneficial effect on soil structure thereby reducing the runoff and sediment loss.