Compression of Cellular Plastics at High Strain Rates

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67247/2/10.1177_0021955X7100700205.pd

Tillage and crop rotation effects on subsurface drainage response to rainfall

A field study was conducted to determine if tillage and crop rotation affected subsurface drainage response to rainfall. An instrumentation system collected subsurface drain flow data from thirty-six, 0.4 ha plots during the 1993, 1994 and 1995 growing seasons. Response time, time-to-peak drain flow rate, drainage volume, peak drain flow rate and percent preferential flow were compared between two tillage systems (no-till and chisel plow) and two crop rotations (continuous corn and corn-soybean) for 23 drainage events over the three-year study. The influence of preferential flow was estimated for each drainage event using a hydrograph separation procedure based on subsurface drain flow rate changes

Irrigation and disease management of vegetables

Wise use of irrigation may help farmers to reduce fungicide applications on vegetable crops. Such a reduction is potentially significant when one considers that irrigation, fertilizer, and pesticide use account for more than 50 percent of the energy expended in fresh vegetable production

Seasonal changes in flow and nitrate-N loss from subsurface drains

Subsurface drainage from thirty-six, 0.4-ha plots was monitored for three years (1990 to 1992) from chisel plow, moldboard plow, ridge till, and no-till systems with continuous corn and corn-soybean rotations. Data were analyzed in four seasonal stages to determine variations in drain flows and nitrate-N contents in drain effluent. The hypothesis of this study was that differences among tillage systems would change during the monitoring season as rainfall patterns varied and as plots were fertilized and cultivated

Understanding the potential of phosphorus transport to water resources via leaching

Improved management of phosphorus (P) from both manure and fertilizer sources is important because of surface water quality concerns. This study considers possible P loss via leaching through the soil and examines the dynamics of the adsorption/extraction process

Proceedings of the 23rd annual Central Plains irrigation conference

Presented at Proceedings of the 23rd annual Central Plains irrigation conference held in Burlington, Colorado on February 22-23, 2011

Proceedings of the 21st annual Central Plains irrigation conference, Colby Kansas, February 24-25, 2009

Presented at the 21st annual Central Plains irrigation conference on February 24-25, 2009 in Colby, Kansas

Reducing the cost of pumping irrigation water

Irrigation accounts for a large portion of the energy used in Nebraska agriculture. The cost to pump irrigation water depends on the type of energy used to power the pumping unit. This document describes a method to estimate the cost of pumping water and to compare the amount of energy used to that for a well maintained and designed pumping plant. The results can help determine the feasibility of repairing the pumping plant

Is Social Psychology Really Different?

Gergen (1976), outlines a number of problems that make it difficult to apply general social psychological the ories, or to assess their validity unequivocally. These dif ficulties are not unique to social psychology, however. The application of general scientific principles has never been a simple matter, not even in the well-established physical sci ences. Moreover, there are formidable difficulties in asses sing general theoretical propositions in every field of in quiry, since empirical procedures will inevitably depend on assumptions about local field conditions, the adequacy of meas urement techniques, and the like. As a consequence, if re sults are inconsistent with theoretical expectations, there will always be some uncertainty as to where the problem lies. Social psychologists should not assume that their difficulties are totally unlike those encountered in other fields of sci entific inquiry. The problems raised by Gergen do not, con sequently, rule out the possible development and application of general social psychological theories.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69124/2/10.1177_014616727600200417.pd