Science in Action to Improve the Sustainability of Agriculture, Natural Resources and Food Systems
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October 23, 2014
In early September I visited a remarkable organic farm on the coast of California. This farm has been in organic production for about 30 years, and its harvests of mostly organic tomatoes have been marketed through a variety of outlets in Northern California.
I arrived on the day picking had just begun on a sloping tomato field about 6 acres in size. The crop was exceptionally clean, with virtually no insect damage and few weeds. Minimal, organically approved control measures had been used, including applications of sulfur and releases of trichogramma (beneficial wasps), along with many hours of hand weeding.
October 21, 2014
In a previous post, I explained that available evidence currently indicates nitrous oxide emissions may be fairly low in the inland Pacific Northwest, compared to other cropland agricultural systems in the U.S. and world. If ongoing research confirms these early results, then I suggested that efforts to reduce nitrous oxide emissions need to focus on strategies that offered strong co-benefits.
October 16, 2014
On a brown, August-dry field in Eastern Washington, a farmer in a combine cuts a 24-foot swath across a field of wheat. The harvested grain then begins a journey, first to the storage bin, then to the local elevator, on rail to a flour mill, by truck to a bakery, by oven to bread, and by car to a home where it is eaten. This is good; our foremost mandate to agriculture is to produce food. However, with this successful export of food from farm fields to nearby and distant cities comes a problem: the nutrients in the bread, the nutrients that we need from food, and that plants need to grow, are now far from the field they came from. How do we replace them?
High yields, which we want, increase the problem. A typical irrigated winter wheat field will yield 140 bushels per acre; about 5,600 loaves of bread. For a center pivot circle of 100 acres, the nutrients in those loaves amount to 182 pounds of N, 70 of P2O5 and 49 of K2O and smaller amounts of other essential nutrients that do not have to be replaced every year. All this ends up somewhere else (in people’s bodies or in sewage treatment plants); it will not be returned to the field1.
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