Global data on crop nutrient concentration and harvest indices

Estimates of crop nutrient removal (as crop products and crop residues) are an important component of crop nutrient balances. Crop nutrient removal can be estimated through multiplication of the quantity of crop products or crop residues (removed) by the nutrient concentration of those crop products and crop residue components respectively. Data for quantities of crop products removed at a country level are available through FAOSTAT (https://www.fao.org/faostat/en/), but equivalent data for quantities of crop residues are not available at a global level. However, quantities of crop residues can be estimated if the relationship between quantity of crop residues and crop products is known. Harvest index (HI) provides one such indication of the relationship between quantity of crop products and crop residues. HI is the proportion of above-ground biomass as crop products and can be used to estimate quantity of crop residues based on quantity of crop products. Previously, meta-analyses or..., Data acquisition
Data were primarily collated from meta-analyses found in scientific literature. Terms used in Ovid (https://ovidsp.ovid.com/), CAB Abstracts (https://www.cabdirect.org/) and Google Scholar (https://scholar.google.com/) were: (crop) AND (“nutrient concentration” OR “nutrient content” OR “harvest index”) across any time. This search resulted in over 245,000 results. These results were refined to include studies that purported to represent crop nutrient concentration and/or harvest index of crops for geographic regions of the world, as opposed to site-specific field experiments. Given the range in different crops grown globally, preference was given to acquiring datasets that included multiple crops. In some cases, authors of meta-analyses were asked for raw data to aid the standardisation process. In addition, the International Fertilizer Association (IFA), and the Food and Agriculture Organization of the United Nations (UN FAO) provided data used for crop nutrient balanc..., R scripts to produce these data  are available at: https://github.com/ludemannc/Tier_1_2_crop_coefficients.git.
README_LUDEMANN_CROP_DATA_2023.txt
Provides details of all the data files in this DRYAD submission.
Data_diagram_25102022.csv
Illustrates the general process for standardisation of data into the final formats.
Combined dataset (Combined_crop_data.csv)
This dataset includes the combined crop coefficient data from all sources before it was summarised by Tier category. Two metadata files accompany the Combined_crop_data.csv file. The Meta_data_Combined_crop_data_1.csv file describes the header parameters, while the Meta_data_Combined_crop_data_2.csv file describes units for each variable used in the file.
Data summarised at Tier 1 and 2 level (Tier_1_and_2_crop_coefficients.csv)
This dataset includes a summary of the data from the Combined_crop_data.csv file. Data were summarised into mean values across sources that purported to represent the World (indicated as being Tier 1) an..., This README_LUDEMANN_CROP_DATA_2023.txt file was generated on 2023-11-23 by Cameron Ludemann

GENERAL INFORMATION

1. Titles of Datasets:

README_LUDEMANN_CROP_DATA_2023.txt
Provides details of all the datafiles in this DRYAD submission.

Data_diagram_25102022.pdf
Illustrates the general process for standardisation of data into the final formats.

Combined dataset (Combined_crop_data.csv)
This dataset includes the combined crop coefficient data from all sources before it was summarised by Tier category. Two meta data files accompany the Combined_crop_data.csv file. The Meta_data_Combined_crop_data_1.csv file describes the header parameters, while the Meta_data_Combined_crop_data_2.csv file describes units for each variable used in the file.

Data summarised at Tier 1 and 2 level (Tier_1_and_2_crop_coefficients.csv)
This dataset includes a summary of the data from the Combined_crop_data.csv file. Data were summarised into mean values across sources that purported to represent the World ...