ABSTRACT

Farmyard manure, vermicompost and leonardite materials are widely used to improve soil fertility. However, studies determining the effect of these organic materials on soil carbon and nitrogen gain at different times after mixing them with the soil are limited. This study was conducted to determine the effects of increased doses of leonardite, vermicompost, and farmyard manure (0, 20, 40, and 60 tons ha⁻¹) on soil nitrogen concentration and carbon cycle at different incubation times (0, 15, 30, 45, 60, and 90 days) after they were mixed into the soil. Analysis results of soil samples taken during six different incubation periods showed that organic matter amount in the soil, total nitrogen (N), and nitrogen components (NO₃^–NH₄⁺) varied significantly depending on the type of material applied, the amount of application, and the residence time of the material in the soil. The most significant increases in the amount of the soil organic matter were determined on the 90^th day of mixing 40 tons of ha⁻¹ vermicompost into the soil, on the 60^th day of mixing 40 tons of ha⁻¹ leonardite into the soil, and on the 30^th day of mixing 60 tons of ha⁻¹ farmyard manure into the soil. The highest values in terms of soil total nitrogen concentration was observed on the 60^th day of application of 60 tons of ha⁻¹ leonardite to the soil, on the 15^th day of application of 60 tons of ha⁻¹ vermicompost, and on the 45^th day of application of 40 tons of ha⁻¹ farmyard manure. As a result, it was determined that the positive effect of increased doses of organic material on soil characteristics increased with prolonging of incubation time and vermicompost was an important organic material that might be an alternative to farmyard manure.

摘要

农家肥、蚯蚓粪和莱昂纳石材料被广泛用于提高土壤肥力。然而，确定这些有机材料在与土壤混合后不同时间对土壤碳和氮增加的影响的研究是有限的。本研究旨在确定在不同孵化时间（^0、15、30、45、60 和 90 天）在它们混合到土壤中后。对 6 个不同孵化期土壤样品的分析结果表明，土壤中有机质含量、总氮 (N) 和氮组分 (NO ₃ ^– NH ₄ ⁺) 根据所用材料的类型、施用量和材料在土壤中的停留时间而有显着差异。在将 40 吨 ha -1 蛭石混合到土壤中的第 90 天^，在将 40 吨 ha -1 leonardite 混合^{到土壤中的第}60天，确定了土壤有机质量的最显着增加，第30^天将60吨ha ^-1农家肥混入土壤。在土壤中施用 60 吨 ha ^-1 leonardite 的^第60 天观察到土壤总氮浓度的最高值， 15 ^th施用 60 吨 ha ^-1蚯蚓粪，第 45^天施用 40 吨 ha ^-1农家肥。结果表明，增加有机材料剂量对土壤特性的积极影响随着孵化时间的延长而增加，蚯蚓粪是一种重要的有机材料，可能是农家肥的替代品。