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1. The Fertilizer Recommendation Support Tool (FRST) Initiative: National Survey on Soil Fertility Recommendations and Correlation/Calibration DatabaseSoil fertility testing is an integral tool used in nutrient management planning, providing information needed to determine where nutrients are required and how much to apply. While a great deal of effort has been successfully invested in standardizing soil test methods in the U.S. over the last few decades, up-to-date correlation/calibration studies are lacking in many states. In most cases, soil test correlation/calibration efforts lead by land-grant universities are on a state-by-state or lab-by-lab... S.E. Lyons, J.T. Spargo, D.L. Osmond, A.W. Pearce, N.A. Slaton, D.K. Arthur, P.J. Kleinman, J.M. Mcgrath |
2. Comparative Analysis of Soil Tests for Soil Health and Nutrient ManagementOptions for soil tests to address soil health and nutrient management objectives have diversified. We compare different soil test methods to evaluate their similarities for providing recommendations. Traditional soil tests, ion exchange membranes and analyses using the Haney Soil Health Nutrient Tool and Soil Health Index were compared for soil sampled from long-term cropping system trials near Ritzville Washington and from the R.J. Cook Agronomy Farm near Pullman WA. Despite strong... D. Huggins, C. Rieser, J. Reganold |
3. Evaluating and Revising Guidelines for Blueberry Tissue Nutrient Standards in WashingtonLeaf tissue nutrient analysis is frequently used in perennial fruit crops to develop nutrient management plans. In blueberry, samples historically are collected between 15 July - 15 August and the results are used for planning nutrient management the next growing season. Northern highbush blueberry tissue nutrient standards were initially developed by Michigan State University and have recently been revised for western Oregon. However, the proliferation of blueberry production... J. Davenport, L. Devetter |
4. Nitrogen Management and Budgets for Irrigated Cotton in the Western USAWe present research on new and improved and updated N fertilizer management recommendations for 4-bale/acre cotton based on a 36-inch NO3-N soil test for irrigated cotton from a 2-year study on surface/furrow irrigation study and a 1-year study under sprinkler irrigation. We also compared UAN with UAN plus the N loss inhibitor Agrotain Plus. Additionally, we compared reflectance- based N fertilizer management with soil test-based management. Nitrogen balances indicated that residual soil NO3 was... K. Bronson, J. Mon, E. Bautista, D. Hunsaker |
5. Advancing Nitrogen and Irrigation Management for Row Crops and Biofuel Crops in the Western USNitrogen, irrigation and N by irrigation studies from West Texas and central Arizona are discussed. In the first study with surface drip, deficit irrigation, N fertilizer rate response was observed with cotton (Gossypium hirsutum L.) in 50 and 75 % ET replacement, but not with dryland or 25 % ET. Irrigation level response was evident with LEPA in two of three years in Lamesa Texas, but not in a wet, third year. Variable-rate N showed a more consistent response than blanket-rate N in that... K. Bronson, J. Mon, D. Hunsaker, G. Wang |
6. Organic Management Improves Soil Health and Strawberry Nutritive ValueSoils and strawberries from 13 matched pairs of organically and conventionally managed fields were assessed over two years. Available plant nutrients were generally similar under organic and conventional management except that organically managed soils contained more available Zn and B. Soil C, N, and biological parameters were much greater under organic management. Organically produced strawberries matched by variety were smaller and had greater dry matter content than conventionally produced... L. Carpenter-boggs, J. Reganold, J. Reeve, P. Andrews |
7. Demonstration of Veris Nir Soil Carbon Mapping TechnologyThe new VERIS Technologies Near Infra Red (NIR) Spectrophotometer compares soil spectral measurements with soil carbon (C) and other properties. These data can be utilized to generate maps of soil characteristics across the landscape. This potentially useful system may simplify the measurement of important soil properties, provide a new tool for evaluation of residue conservation management practices, and guide farmers in soil management decisions based on data heretofore unavailable. While growers... P. Carter, S. Van vleet, E. Perry, S. Young, F. Pierce |
8. Economics of Fertilization Under Site-specific Management ZonesSite-specific management of crop fields using variable rate application of inputs to manage in-field variability has now been around for over 15 years. However, the degree to which site-specific management strategies increase farm profitability is not well established. The objectives of this study were: to compare uniform and variable-rate Nitrogen (N) management strategies across productivity level site-specific management zones and to identify the most profitable N management strategy. This... R. Khosla, D. Westfall, W. Frasier, B. Koch |
9. An Evaluation of the Effects of Diversified Cropping Systems on Soil Organic Matter, Nutrient Dynamics, Yield and Economics of Dry Land Winter Wheat and Irrigated Sugar Beet in WyomingThe overall objective of this study is to evaluate the effects of different cropping systems and irrigation methods used by Wyoming farmers on soil chemical, biological and physical properties, yield, economic returns and long term ecological sustainability of dryland and irrigated crop production. The Project, which is being carried out on dryland winter wheat systems in the Albin and Slater areas and on irrigated sugar beet systems in the Big Horn basin near Powell, will go... J. Norton, E. Mukhwana |
10. Nitrogen Cycling and Partitioning Under Alternative Organic Orchard Floor Management StrategiesOrganic orchard systems are a significant and growing component of Washington State agriculture, yet sustainable methods of nitrogen (N) fertility and weed management remain a challenge. Nutrient supply is dependent on decomposition and mineralization of organic matter, yet intensive cultivation commonly used to control weeds can disrupt biological processes and cause loss of organic matter. To address the often-competing goals of organic fertility and weed control, a number of alternative orchard... L. Carpenter-boggs, D. Granatstein, J. Reganold, L. Hoagland, M. Mazzola, F. Peryea, J. Smith |
11. Variable Rate N and P Management for High-value Vegetable Cropping SystemsThe Lower Colorado River Region (LCRR) of Arizona and California and their environs produce more than 90% of the nation’s cool season vegetables during the fall-winter-spring period. Large amounts of N and P fertilizers are currently utilized for maximum yield and quality. Phosphorus fertilizers are applied pre-plant based on a soil test of a composite field sample. Nitrogen is applied by side-dress based on a plant midrib or petiole N analysis, or soil nitrate-N test, from a... C.A. Sanchez, P. Andrade |
12. Floral Hemp Responses to Nitrogen Fertilization in the High DesertThe performance of floral hemp under N fertilization is influenced by environmental conditions, management and cultivar selection. This field study evaluated the effect of no supplemental N and N fertilization at 90 kg ha-1 on three hemp cultivars (Berry Blossom, Red Bordeaux, and Tahoe Cinco) in Northern Nevada. Nitrogen increased plant height, canopy cover, stem diameter and shoot biomass, but other physiological parameters were dependent on cultivar. We evaluated the use... F. Barrios masias, M. Farnisa, J. Solomon, G. Miller |
13. Optimizing Fertigation for High Value CropsIn irrigated farming systems, soluble and mobile fertilizers, such as sources of nitrogen, are often applied to crops through fertigation. Fertigation presents both opportunities and challenges. Potential opportunities include better synchronization of nutrient availability with crop demand through the growing season and potential energy savings. Challenges include the need for additional investment on infrastructure for nutrient injection into the irrigation conveyance and distribution system,... C.A. Sanchez, D. Zerihun |
14. ManureDB: Creating a Nationwide Manure Test DatabaseManure nutrients serve an important role in crop production, however compared with commercial fertilizers there is a lack of standardized information. When exact manure values are not known, manure book values have been referenced. Recent data from midwestern United States (US) labs indicates manure nutrient levels have changed from book values published by Midwest Plan Service (2004) and American Society of Agricultural and Biological Engineers (2005). Manure laboratory analysis has improved... N.L. Bohl bormann, M.L. Wilson, E.L. Cortus, K. Janni, K. Silverstein, L. Gunderson |