@article{Lapra:256527,
      recid = {256527},
      author = {Lapra, Dominique David},
      title = {NORMES ET INTERPRETATION AGRONOMIQUE DES ANALYSES DE SOLS  AU LAPRA EN GUADELOUPE},
      address = {2004-07-19},
      number = {1869-2017-404},
      pages = {10},
      year = {2004},
      abstract = {During 2004, The soil laboratory LAPRA has conducted a  review of the interpretation norms of its chemical  analysis, and has developed an expert system of  fertilization advice. The system considers six soils' units  and sub-units: Hydric andosols, andosols, brown soils,  nitisols, oxysols, and vertisols, justified by their  different origin and chemical characteristics. The system  also differentiate the two main crops of Guadeloupe: Sugar  cane and banana. The diagnostic assessment of soil  fertility relies on threshold values Sn allowing to qualify  the result and to propose a fertilization advice. These  threshold values have been determined according to soils  characteristics, nutritional requirements of the plants,  and fields results (2400 analysis). They may also consider  relationships between variables. Each assessment may result  from the reading of one or several variables. In this way,  the diagnosis of soil acidity depends on two variables : pH  and calcium, while Κ and Mg will be appraised individually  and according to the ratio K/Mg. The system of  interpretation and fertilization plan is automatic.  Calculations include efficiencies of inputs that may vary  according to soil type, and optimum quantities of calcarus  amendments. It also allows to advise not to use potassium  when the soil has enough reserves for the plants.},
      url = {http://ageconsearch.umn.edu/record/256527},
      doi = {https://doi.org/10.22004/ag.econ.256527},
}