Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2005-2007
Winter 2006 Variable Rate P Application Increases Rice and Soybean Yields Drs. T. Walker, M. Cox, W. Kingery, S. Martin, L. Oldham, J. Street Summary: Low rice and soybean yields were associated with low soil P and compaction in cut areas. Variable rate P application increased whole field yield and reduced yield variability. Higher crop yields and potentially greater uptake of applied P should also result in reduced environmental P risks. More precise application of P helps maximize yield and stabilize production Fluid Journal 1 Approximately 1.1 million acres of soybeans and 250,000 acres of rice were produced in the Mississippi Delta region in 2003. Because of the alluvial nature of Delta soils, the variability in soil properties can be extensive. In addition to this natural variability, the practice of precision land leveling of fields for irrigation purposes can significantly contribute to soil and crop variability. Soil and crop variability that results from the land-leveling process is now being more accurately quantified by using precision farming (PF) tools such as differential-corrected global positioning systems (DGPS), yield monitors, and geographical information systems (GIS). The implementation of PF tools is not just beneficial to researchers. If used correctly, PF tools have the ability to help producers operate more efficiently, which often increases cash flow. The use of PF tools has increased since the technologies became commercially available in the mid-1990s. One important PF tool used by many rice and soybean producers in the Mississippi delta is the DGPS yield monitor that allows producers to collect enormous amounts of data each year. Many producers, however, have begun to experience difficulties in data management and synthesis after having collected multiple years of yield data. As a result, implementation of site- specific practices designed to help their crop management programs has been seriously impaired, causing many producers to question the feasibility of this technology. The objectives of the research as outlined in this article were to use PF tools to: 1) define zones within a rice/ soybean field where yields were consistently high, average, or low, 2) determine the factors that cause yield
Fluid Journal 2002-2004
Fluid Journal 2008-2009