Citrus Best Management Practices: Fertilizer Rate Recommendations and Precision Application in Florida
Water quality concerns for groundwater and surface water sources in Florida have led to the development of fertilizer Best Management Practices (BMPs) for agricultural producers designed to minimize agricultures impact on the environment. BMP-related research conducted during the last decade resulted in revisions to the fertilizer recommendations for Florida citrus that have been incorporated into the University of Florida citrus nutrition guidelines. Fertilizer rates and application timing are discussed with emphasis on reducing the potential for fertilizer leaching and runoff. Recommended application rates for young trees are 68 - 136g/tree, 136 -272g/tree, and 203 408g/tree for both N and K2O during years 1 - 3, respectively, and vary based on soil type, land history, and fertilizer source. Recommended N and K2O applications for bearing orange trees range from 135 -225 kg/ha for years 4 through 7 and 158 -282kg/ha for trees 8 or more years old and depend on the soil characteristics, yield potential, and tree needs as indicated by leaf analysis, with greater emphasis on the past and projected yields of the trees. Grapefruit N and K2O recommendations range from 135 - 180kg/ha. Recommendations for P applications depend on soil and leaf tissue test results. Discussion of Ca, Mg and micronutrients are covered as well as foliar applications of nutrients. Advances in precision application equipment have led to greatly increased placement efficiency in highly variable Florida citrus orchards. The paper discusses several case studies where variable rate fertilizer spreaders have led to reductions of 20％ to 50％ in applied fertilizers with no reduction in fruit production, promoting environmental BMPs while saving fertilizer material cost.
Citrus Fertilizer rate Application Florida
B. J. Boman T. A. Obreza K. T. Morgan
University of Florida, Indian River Research and Education Center, 2199 South Rock Road, Fort Pierce University of Florida, Soil and Water Science Dept. , P. 0. Box 110290, Gainesville,FL 32611, USA University of Florida, Southwest Florida Research and Education Center, 2686 R 29 N, Immokalee, FL 3
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
572-578
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）