Soil assessment builds information for improved decision in
    soil management. It analyzes soil conditions with regard to
    agriculture crop suitability requirements [such as those given by FAO
    <https://www.fao.org/land-water/databases-and-software/crop-information/en/>]
    soil fertility classes, soil erosion, and soil salinity classification
    [<doi:10.1002/ldr.4211>]. Suitability requirements are for
    crops grouped into cereal crops, nuts, legumes, fruits, vegetables,
    industrial crops, and root crops.

Facilitates basic and equation-based analyses of some important soil properties related to soil chemical environment and nutrient availability to plants. Freundlich H (1907). <doi:10.1515/zpch-1907-5723>. Datta SP, Bhadoria PBS (1999). <doi:10.1002%2F%28SICI%291522-2624%28199903%29162%3A2%3C183%3A%3AAID-JPLN183%3E3.0.CO%3B2-A>."Boron adsorption and desorption in some acid soils of West Bengal, India". Langmuir I (1918). <doi:10.1021/ja02242a004> "The adsorption of gases on plane surfaces of glass, mica, and platinum". Khasawneh FE (1971). <doi:10.2136/sssaj1971.03615995003500030029x> "Solution ion activity and plant growth".

Includes four functions: RFactor_calc(), RFactor_est(), KFactor() and SoilLoss(). The rainfall erosivity factors can be calculated or estimated, and soil erodibility will be estimated by the equation extracted from the monograph. Soil loss will be estimated by the product of five factors (rainfall erosivity, soil erodibility, length and steepness slope, cover-management factor and support practice factor. In the future, additional functions can be included. This efforts to advance research in soil and water conservation, with fast and accurate results.

A collection of functions for reading soil data from U.S. Department of Agriculture Natural Resources Conservation Service (USDA-NRCS) and National Cooperative Soil Survey (NCSS) databases.

Analyzing soil food webs or any food web measured at equilibrium. The package
  calculates carbon and nitrogen fluxes and stability properties using methods
  described by Hunt et al. (1987) <doi:10.1007/BF00260580>, de Ruiter et al. 
  (1995) <doi:10.1126/science.269.5228.1257>, Holtkamp et al. (2011)
  <doi:10.1016/j.soilbio.2010.10.004>, and Buchkowski and Lindo (2021) 
  <doi:10.1111/1365-2435.13706>. The package can also manipulate the structure 
  of the food web as well as simulate food webs away from equilibrium and run 
  decomposition experiments.