Data from: Continuous corn and corn–soybean profits over a 45-year tillage and fertilizer experiment

Tillage x Fertility Crop Costs and Profits 1970 to 2014These data represent the costs and profit (in 2014 US dollars per acre) associated with each tillage x fertility treatment plot. These data were used for the analysis in the Trlica et al. 2017 manuscript. Data were converted from $/ac to $/hectare for publication, but per hectare data are not included here.TxF_Econ_model_output.csvNominal Prices 1970-2014Summary of nominal (not inflated to 2014 US dollars) prices of inputs per unit, commodity values per bushel of corn and soybean, and composited PPITW index (2011=100).prices_final.csvTillage x Fertility R script for data collation"TxF_Economics_data_collation_final.R" is the R script file used to process and data files and generate cost, price, and profit estimates used in Trlica et al. (2017). All costs and prices quoted in U.S. dollars ($). Additional price and index information gathered from other reports and sources integrated into final price sheet are detailed in the R script and in Trlica et al. (2017). The "Econ data" files can be used with this script if you direct it at the right file folder, should be able to reproduce all the output files that we used for analysis.TxF_Economics_data_collation_final.RAg_lime_2014-1970_priceEcon data file: "Ag_lime_2014-1970_price.csv" — Agricultural lime (CaCO3) price, applied to field, U.S. Average, 1970–2014 (USDA NASS Quick Stats download).Amm_nit_2014_1970_priceEcon data file: "Amm_nit_2014_1970_price.csv" — Ammonium nitrate price (nominal $/ton), U.S. Average, 1970–2014 (USDA NASS Quick Stats download).corn_price_USDANASSEcon data file: "corn_price_USDANASS.csv" — Corn sale price (nominal $/bu), U.S. Average, 1970-2014 (USDA NASS Quick Stats download)Gly_2014_2001_pricesEcon data file: "Gly_2014_2001_prices.csv" — Glyphosate price (4 lb ai/U.S. gal), U.S. Average, 2001-2014 (USDA NASS Quick Stats download).Herb_useEcon data file: "Herb_use.csv" — schedule of post-emergent herbicide applications used on No-till plots, 1970–2014: Gly_lbsai (Glyphosate, lbs a.i./ac), Para_lbsai (Paraquat, lbs a.i. per acre) See Cook and Trlica (2016).Labor_UnsortedEcon data file: "Labor_Unsorted.csv" — unsorted labor wage rates, U.S. Average, 2015–1978 (USDA NASS Quick Stats download).Lime_appl_2014_1970Econ data file: "Lime_appl_2014_1970.csv" — schedule of lime applications to the site by plot ID (tons per acre). Rates given for applications in 1975, 1983, 1991, 2001, 2012. See Cook and Trlica (2016).Mach_op_costsEcon data file: "Mach_op_costs.csv" — Operation costs for machinery activities, by implement type (determined from Illinois FarmDocs calculator tool, see Trlica et al. (2017))Mach_price_index_1990Econ data file: "Mach_price_index_1990.csv" — Machinery Totals (1990-index), index for Price Paid 1975-1990 (USDA NASS Quick Stats download).Mach_price_index_2011Econ data file: "Mach_price_index_2011.csv" — Machinery Totals, index for Price Paid (2011-index), 1990-2014 (USDA NASS Quick Stats download).Master_Yield_1970-2014_econEcon data file: "Master_Yield_1970-2014.csv" — table of corn yield and ancillary field data for 1970–2014 seasons. Data file identical to file used in Cook and Trlica (2016) (see Dryad Digital Repository doi:10.5061/dryad.7920c). Data missing entirely for years 1981, 2008 due to crop loss.Para_2008_2001_pricesEcon data file: "Para_2008_2001_prices.csv" — Paraquat price (2.5 lb ai/U.S. gal), U.S. Average, 2001–2008 (USDA NASS Quick Stats download).PPITW_2013-1975-1990indexEcon data file: "PPITW_2013-1975-1990index.csv" — PPITW (Prices Paid Index for Commodities and Services, Interest, Taxes, and Farm Wage Rates) (1990=100) for 1975–2013 (USDA NASS Quick Stats download).PPITW_2014-1990-2011indexEcon data file: "PPITW_2014-1990-2011index.csv" — PPITW (2011=100) for 1990–2014 (USDA NASS QuickStats download).soy_price_USDANASSEcon data file: "soy_price_USDANASS.csv" — Soybeans sale price (nominal $/bu), U.S. Average, 1970-2014 (USDA NASS Quick Stats download).Table7_Fert_prices_1960Econ data file: "Table7_Fert_prices_1960.csv" — Table 7 from report "Fertilizer Use and Price" listing price (nominal $/ton) of triple superphosphate (44-46%P) and potash/potassium chloride (60% K) 1960–2013 (see USDA Economic Research Service, https://www.ers.usda.gov/data-products/fertilizer-use-and-price.aspx)Urea_2014_1970_priceEcon data file: "Urea_2014_1970_price.csv" — Urea price (nominal $/ton), U.S. Average, 1970–2014 (USDA NASS Quick Stats download).Tillage x Fertility Econ data sample SAS codeThis is an example of the SAS code used to analyze the final dataset for the Trlica et al. 2017 publication.TxF_Econ_SASmixedmodel.txt