Science in Action to Improve the Sustainability of Agriculture, Natural Resources and Food Systems
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December 13, 2017
Models suggest that climate change in our region will involve an annual temperature increase of 3-4°F by the 2050’s, accompanied by changes in precipitation patterns, including drier summers despite a 5-15% increase in annual precipitation (Kruger et al. 2017). Even with this information, uncertainty still exists about what climate change will mean for agriculture, in general, and for dryland farming systems in our region, in particular. The book Advances in Dryland Farming in the Inland Pacific Northwest, does its part to help managers make decisions despite this uncertainty. Three chapters in this book explore management of diseases, insects, and weeds (the three major categories of pests) and were written by teams of authors led by Elizabeth Kirby (Washington State University), Sanford Eigenbrode (University of Idaho), and Ian Burke (Washington State University), respectively. Though these chapters provide a wide range of regionally-relevant information that goes far beyond climate, I found it particularly interesting to read through them with an eye to what farmers might expect in terms of changes in pest pressures as a result of projected changes in the climate. Through this process, I learned that although climate change models have improved vastly in recent years, quite a bit of uncertainty exists about the effects of climate change on complex biological systems.
December 12, 2017
About a year ago I declared in a post, “Cover crop best bet is monoculture, not mix.” It stirred up quite a few comments and discussion, but no scientific evidence that countered my assertion. Nevertheless, research continues, so I have followed results as they have been published over the last year. Here is an update.
December 5, 2017
Though severe erosion can quickly deplete topsoil, rebuilding topsoil is an extremely difficult and slow process, so conserving this resource is imperative. Soil erosion is one of the biggest challenges in agricultural production in the inland Pacific Northwest. Conventional tillage can lead to soil degradation and erosion by wind and water, which can cause concerns for air and water quality, respectively. Conservation tillage—a tillage system which retains residues from the previous crop on the surface, resulting in at least 30% coverage of the soil surface after the planting of the next crop—can dramatically reduce soil erosion. It also offers other benefits, such as improvements in soil quality (Figure 1) and reduced fuel use, allowing it to be widely adopted in some parts of the region. There are many types of conservation tillage used in the Pacific Northwest, which offer different levels of protection of the soil, all the way up to no-till, which results in minimal soil disturbance and maximum retention of soil residue. These differences in practices, as well as other factors, have led to variations across the region in how effective (and profitable) conservation tillage has been. Fortunately, a new resource is available that digs into these differences and why they occur.
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