Location:2011 Annual Report
1a. Objectives (from AD-416)
Objective 1: Identify optimal strategies for incorporating bioenergy crops into irrigated Pacific Northwest Region cropping systems. • Sub-objective 1.A. Evaluate the impacts of harvest of C3 and C4 grass perennial biomass crops and the removal of crop residues on carbon sequestration, nutrient dynamics, and soil quality in irrigated Pacific Northwest crop rotations. • Sub-objective 1.B. Determine the efficacy of co-products from agricultural-based energy production on weed and disease control and soil fertility improvement in irrigated crop production systems. Objective 2. Identify optimal combinations of management practices to lower total production costs while maintaining market quality of irrigated potato-based production systems. • Sub-objective 2.A. Determine the impact of reduced tillage on soil conservation/erosion soil physical properties, the mechanisms controlling carbon and nitrogen cycling, and trace gas (CO2, N2O, CH4) fluxes and C sequestration and the yield and quality response of potato and rotational crops. • Sub-objective 2.B. Evaluate the effects of deficit irrigation practices on potato yield and tuber quality. • Sub-objective 2.C. Validate the ARS Potato Growth Simulation Model for the irrigated inland Pacific Northwest region. Objective 3. Develop ecologically-based management strategies that enhance vegetable yields and soil quality in irrigated organic production systems. • Sub-objective 3.A. Quantify key soil agroecological processes (carbon and nitrogen cycling) and application rates of organic amendments that optimize physiological development (nitrogen capture, plant growth rate) of potato under irrigated organic cropping systems. • Sub-objective 3.B. Integrate hybrids with weed suppressive traits into organic specialty crop production systems.
1b. Approach (from AD-416)
Long-term sustainability of potato production in the Pacific Northwest will depend not only on balancing the physiological production requirements, but also overcoming additional constraints to system productivity and profitability. Assessing sustainability and the basic interactions among system components are multifaceted tasks that require long-term studies integrating a multidisciplinary approach to understand system constraints and also provide data needed to support evaluation of impacts of specialty crops by system modelers. Improved cropping systems will be developed that reduce erosion, reclaim excess N, build organic matter, and suppress pests and improve soil and environmental quality and economic viability. Application of conservation tillage to specialty cropping systems will be investigated to evaluate improving environmental, biological and economic sustainability. With the expansion of the bioenergy industry in the U.S. and state and regional mandates for biofuel blending have made biofuels a high priority issue for the USDA. The expansion of the biofuel industry on potato and other specialty crop production will be investigated. The projected growth of the ethanol and biodiesel industries in the PNW will produce large quantities of organic-based co-products. These co-products are much greater than what can be utilized locally as a source of animal feed, so alternative value added uses will be investigated. The use of these co-products could be used to offset the high costs of nutritional and pest control requirements of potato and specialty crops. The demand for organic produce continues to expand and is of increasing interest to PNW growers. Managing weeds and providing adequate nutrients are the two major production issues for organic producers. Economical and environmentally friendly solutions are needed for organic producers to increase production efficiency by management of weeds and nutrients. Formerly 5354-21660-001-00D (8.08).
3. Progress Report
NP 216. Objective (1) Identify optimal strategies for incorporating bioenergy crops into irrigated Pacific Northwest Region cropping systems. Sub-objective 1.A. Evaluate the impacts of harvest of grass perennial biomass crops and crop residues on carbon sequestration, nutrient dynamics, and soil quality. Measures of C-sequestration potential by laboratory incubations and 13C analyses were completed for the study. A manuscript was submitted and was published in the Soil Science Society America Journal. Sub-objective 1.B. Determine the efficacy of co-products from agricultural-based energy production on soil fertility improvement in irrigated crop production systems. The field trial established in 2008 evaluating the application of agricultural-based energy co-products (e.g. oil-seed meals, distillers grains, anaerobic digested dairy manures) to reduce the application of synthetic fertilizers has been completed. Final third year assessments of the soil nutrient, potato quality and efficacy of bioenergy co-products are being analyzed. Two manuscripts on the use of biochar in soil have been submitted and accepted. 1B1. Onion field trials for weed suppression have been completed. Mustard meal derived from three S. alba genotypes differing in glucosinolate content were evaluated. Manuscript submitted and accepted to Weed Science titled ‘Onion and weed response to mustard (Sinapis alba) seed meal’. Objective 2. Identify optimal combinations of management practices to lower total production costs while maintaining market quality of irrigated potato-based production systems. This study is a continuation of the previous research project. Sub-objective 2.A. Determine the impact of reduced tillage on soil conservation, soil physical properties, and the yield and quality response of potato and rotational crops. Completed measurements of wind erosion and dust (i.e. PM10) emissions under the reduced and conventional tillage and crop. Sub-objective 2.B. The studies of greenhouse gas production have been completed and peer-reviewed manuscript published. Two manuscripts were submitted and accepted. Sub-objective 2.C. Evaluate the effects of deficit irrigation practices on potato yield and tuber quality. The field research has been completed and analysis of data from the field trials are completed. Sub-objective 2.D. Validate potato growth simulation model for the irrigated inland Pacific Northwest region. The SPUDSIM Simulation Model is being developed by the ARS-Crop Systems and Global Change Laboratory, Beltsville, MD. Sub-objective 3.A. Quantify key soil agroecological processes and application rates of organic amendments under irrigated organic potato production. Potato trials were established on a certified organic field has to evaluate a series of organic fertilizers and bioenergy coproducts. Sub-objective 3.B. Integrate sweet corn hybrids with weed suppressive traits into organic specialty crop production. Began data analysis on two year field trial comparing sweet corn hybrid tolerance to weeds under different weed management levels.