gregate formation (Horn, 1990; Zhang, 1994). Understanding of mechanical properties of aggregates is cruAggregate properties determine the macroscale structural condicial to explain the macroscale functions of soil for plant tion of the soil. Understanding of impacts of no-till and traditional growth (DeFreitas et al., 1996). agricultural practices on the mechanical properties of aggregates is ...

Crop growth models can be useful tools in evaluating the impacts of di€erent tillage systems on the growth and ®nal yield of crops. A tillage model was incorporated into CROPGRO-Soybean and tested for conditions in Ames, IA, USA. Predictions of changes in surface residue, bulk density, hydraulic conductivity, runo€ curve number, and surface albedo were consistent with expected behaviors of thes...

greenhouse gases emissions from burning fossil fuels and the effect of these gases on climate change is one of the most important ecological and political issues. in this study the energy consumption and greenhouse gas emissions from tillage and soybean planting were assessed in gorgan. this study is done on 13 soybean farms in 2012. information related to tillage and planting operations were p...

Installation of subsurface tile lines in poorly drained soils is a beneficial management practice that enhances crop productivity. In some instances, however, they can contribute to offsite losses of agricultural chemicals and sediment in drain flow. Movement of these materials through soil macropores (earthworm burrows and cracks) has been shown to contribute to this phenomenon. In order to de...

BACKGROUND: For the cultivation of agricultural crops, technology basic dump tillage is widely used. More than 40% energy resources are spent on it, due to traction resistance working bodies general-purpose plows. The technological process plowing with such has not changed much historically. Pruning soil layer carried out a ploughshare, crumbling and turning blade, stability movement body provi...

The rice-ratoon system has long been considered an important economic, time-saving, and labor-saving planting method. Optimal tillage straw management are beneficial to increasing the growth yield of recycled rice. However, there is little research on physical chemical properties soil under management, its effects fertilizer utilization A field experiment was conducted study four types rice in ...