The persistent of cycles was remark even to the 19th century economists and the rigorous theory of fluctuation or bussines cycle are take form past century. In the analyses dynamics macroeconomic area is can observe a big variety of method and techniques for research fluctuates from economy and...

The Bosque River Watershed in Texas is facing a suite of water quality issues including excess sediment, nutrient, and bacteria. The sources of the pollutants are improperly managed cropland and grazing land, dairy manure application, and effluent discharge from wastewater treatment facilities....

Drainage water management (DWM) has received considerable attention as a potential best management practice (BMP) for improving water quality in tile drained landscapes. The objective of this study was to evaluate the effects of DWM on subsurface drain discharge as well as on nitrogen (N) and...