Simulating landscape catena effects in no-till dryland agroecosystems using GPFARM

Soil sorptivity enhancement with crop residue accumulation in semiarid dryland no-till agroecosystems

Runoff and Erosion Estimates for Great Plains Dryland Agroecosystems

Water is the most production limiting factor for dryland cropping systems in semiarid Great Plains environments. Evaporation is responsible for the greatest amount of water loss and management practices such as notill have been adopted to reduce evaporative losses. Less is known about the magnitude of water loss due to runoff. An objective of this study is to estimate an expected range in rainf...

CROPPING SYSTEMS Evaluation of GPFARM for Dryland Cropping Systems in Eastern Colorado

than 90% were interested in using farm management decision support software (Frasier et al., 1997). The GPFARM is an ARS decision support system for strategic (longsame survey also showed that 57% of 219 producer term) planning. This study evaluated its performance for comparing alternative dryland no-till cropping systems and established limits of respondents were interested in a farm manageme...

Grazing and no-till cropping impacts on nitrogen retention in dryland agroecosystems.

As the world's population increases, marginal lands such as drylands are likely to become more important for food production. One proven strategy for improving crop production in drylands involves shifting from conventional tillage to no-till to increase water use efficiency, especially when this shift is coupled with more intensive crop rotations. Practices such as no-till that reduce soil dis...

Simulated effects of dryland cropping intensification on soil organic matter and greenhouse gas exchanges using the DAYCENT ecosystem model.

We present evidence to show that DAYCENT can reliably simulate soil C levels, crop yields, and annual trace gas fluxes for various soils. DAYCENT was applied to compare the net greenhouse gas fluxes for soils under different land uses. To calculate net greenhouse gas flux we accounted for changes in soil organic C, the C equivalents of N2O emissions and CH4 uptake, and the CO2 costs of N fertil...