tailieunhanh - Strength of individual soil aggregates against crushing forces I. influence of aggregate characteristics

This study was undertaken to determine the relative strength of individual soil aggregates of different sizes and shapes against crushing forces. Soil aggregates were placed individually between a clean–fixed flat surface and a flat plate connected to a pocketpenetrometer and crushed under applied stress. | Tr. J. of Agriculture and Forestry 23 (1999) 567-572 © TÜBİTAK Strength of Individual Soil Aggregates Against Crushing Forces I. Influence of Aggregate Characteristics Taşkın ÖZTAŞ, Koray SÖNMEZ, Mustafa Y. CANBOLAT University of Atatürk, Faculty of Agriculture, Erzurum–TURKEY Received: Abstract: This study was undertaken to determine the relative strength of individual soil aggregates of different sizes and shapes against crushing forces. Soil aggregates were placed individually between a clean–fixed flat surface and a flat plate connected to a pocketpenetrometer and crushed under applied stress. The results of this study show that the strength of the aggregates against disruptive forces was directly related to aggregate size and shape. As the aggregate size increased, so did the applied stress required to crush the aggregate. Significant relationships were found between applied stress and the mass, volume, average diameter (Davg) and geometric mean diameter (Dgm) of the aggregates. Bireysel Toprak Agregatlarının Kırılmaya Karşı Dayanıklılıkları I. Aggregat Özelliklerinin Etkisi Özet: Bu çalışma, farklı büyüklük ve kütleye sahip bireysel toprak agregatlarının kırılmaya karşı olan dayanıklılıklarını belirlemek amacıyla yürütülmüştür. Agregatlar temiz ve pürüzsüz bir zemin ile buna paralel konumda ve cep penetrometresine sabitleştirilmiş iki plaka arasına yerleştirilmiş ve yavaş yavaş arttırılarak uygulanan basınç altında kırılmıştır. Araştırma sonuçları, toprak agregatların tahrip edici mekaniksel kuvvetlere karşı olan dayanıklılıklarının agregatların büyüklük ve şekilleri ile doğrudan ilişkili olduğunu göstermiştir. Agregat büyüklüğü arttıkça, kırılması için uygulaması gereken basınç da artmıştır. Uygulanan basınç değerleri ile agregatların kütlesi, hacmi, ortalama çapı (Davg) ve geometrik ortalama çap (Dgm) değerleri arasında önemli ilişkiler kaydedilmiştir. Introduction Soil reaction to mechanical loads and applied disruptive forces is very .

• Nông nghiệp
• Soil aggregates
• Clean–fixed flat surface
• Dry–soil aggregate
• Aggregate characteristics
• Soil management
• Vietnam Journal of Earth Sciences
• Soil structure and soil organic matter
• Water stable aggregates under different application rates of biochar
• Soil organic carbon
• The proportion of WSA
• Flat plate
• Pocket penetrometer
• Flat surface
• Cation exchange capacity
• Nitrogen level
• Crop type
• Available nutrient status
• Cereal pulse based cropping system
• Different size soil aggregates
• Light fraction carbon
• Water soluble carbon
• Particulate organic matter
• High input cropping system
• Water stable aggregates
• Microbial biomass
• Enzyme activities
• Soil organic matter
• North west IGP
• Crop rotational diversity
• Labile SOM dynamics
• Conservation tillage
• Macro aggregates
• Particulate organic carbon
• Mean weight diameter
• Aggregate associated carbon
• Double rice cropping
• Organics on soil aggregate fractions
• Carbon sequestration
• Carbon mineralization
• Irrigated rice wheat rotation
• Total porosity
• Aggregates stability
• Spatial variability
• Geo statistical tools
• Soil physical properties
• Aerobic rice
• Organic amendments
• Rice wheat cropping
• Aerobically grown basmati rice
• Conventional tillage
• Zero tillage
• Six different cultivars
• Six different cultivars of wheat