Farming practices for global crop production¶.
No-tillage (NT) is generally considered a means of growing crops with positive environmental externalities, such as enhanced carbon sequestration, improved soil quality, reduced soil erosion, and increased biodiversity. However, whether NT systems are as productive as systems relying on conventional tillage (CT) is a matter of debate, fraught with high variability in time and space. Here, we expand existing datasets to include recent field experiment results and produce a global dataset comparing crop yields obtained under CT and NT systems. In addition to crop yields, our dataset also reports information on crop growing seasons, management practices, soil characteristics, and key climate parameters throughout the experimental year. The final dataset contains 4403 paired yield observations for 8 major staple food crops in 50 countries between 1980 and 2017. This dataset provides insight into the main drivers explaining changes in productivity of new technologies and the impact of adoption of new technologies on crop yields. Preface – Bed Length Artificial Intelligence Tutorial
Data Citation¶
Su, Y., Gabrielle, B. & Makowski, D. A global dataset for crop production under conventional tillage and no tillage systems. figshare https://doi.org/10.6084/m9.figshare.12155553 (2020). v14
Paper Citation¶
Su, Y., Gabrielle, B. & Makowski, D. A global dataset for crop production under conventional tillage and no tillage systems. Scientific Data 8, 33 (2021).
Earth Engine Snippet¶
var tillage = ee.FeatureCollection("projects/sat-io/open-datasets/global_tillage_production");
print(tillage.size(),'Total observations')
// Get a color from crop types
var cropColor = ee.Dictionary({
'maize': '000000',
'barley.spring': '593704',
'soybean': 'BC80BD',
'wheat.winter': '0565A6',
'cotton': 'E31A1C',
'sorghum': 'FF7F00',
'sunflower': '6A3D9A',
'wheat_spring': '5CA2D1',
});
// List of crop types to add to the map
var crops = ['maize', 'barley.spring', 'soybean', 'wheat.winter', 'cotton', 'sorghum', 'sunflower',
'wheat_spring'];
function addStyle(pt) {
var color = cropColor.get(pt.get('crop'));
return pt.set('styleProperty', ee.Dictionary({'pointSize': 2, 'color': color}));
}
// Make a FeatureCollection out of the crop table
var pp = ee.FeatureCollection(tillage).map(addStyle);
print(pp.first());
/**
* Adds crop types to the map.
*
* @param {string} fuel A fuel type
*/
function addLayer(fuel) {
print(fuel);
Map.addLayer(pp.filter(ee.Filter.eq('crop', fuel)).style({styleProperty: 'styleProperty', neighborhood: 50}), {}, fuel, true, 0.65);
}
// Apply `addLayer` to each record in `fuels`
cropColor.keys().getInfo().map(addLayer);Property Mapping¶
| Property | GEE property |
|---|---|
| Author | author |
| Journal | journal |
| Year | year |
| Site country | site_country |
| Location | location |
| Latitude | latitude |
| Longitude | longitude |
| Soil information recorded in the paper | soil_from_paper |
| pH (surface layer) | pH_surface_layer |
| Replications in experiment | replications_exp |
| Crop | crop |
| Initial year of NT practice ( or first year of experiment if missing) | init_yr_nt |
| Sowing year | sowing_year |
| Harvest year | harvest_year |
| Years since NT started (yrs) | yrs_from_nt |
| Crop growing season recorded in the paper | cgsp |
| Crop rotation with at least 3 crops involved in CT | crit |
| Crop rotation with at least 3 crops involved in NT | crint |
| Crop sequence (details) | c_seq |
| Cover crop before sowing | cc_bf_sowing |
| Soil cover in CT | soil_cover_ct |
| Soil cover in NT | soil_cover_nt |
| Residue management of previous crop in CT (details) | rm_ct |
| Residue management of previous crop in NT (details) | rm_nt |
| Weed and pest control CT | wp_ct |
| Weed and pest control NT | wp_nt |
| Weed and pest control CT (details) | wpc_ct |
| Weed and pest control NT (details) | wpc_nt |
| Fertilization CT | ft_ct |
| Fertilization NT | ft_nt |
| N input | n_inp |
| N input rates with the unit kg N ha-1 (details) | n_inp_unit |
| Field fertilization (details) | fft |
| Irrigation CT | i_ct |
| Irrigation NT | i_nt |
| Water applied in CT | w_ct |
| Water applied in NT | w_nt |
| Other information | other |
| Yield of CT | yield_ct |
| Yield of NT | yield_nt |
| Relative yield change | rel_yl_chg |
| Yield increase with NT | yl_inc_nt |
| Outlier of CT | outlier_ct |
| Outlier of NT | outlier_nt |
| Sowing month | sw_month |
| Harvesting month | hv_month |
| P | P |
| E | E |
| PB | PB |
| you | you |
| Tmax | Tmax |
| Tmin | Tmin |
| ST | ST |
License¶
This work is licensed under the Creative Commons Attribution 4.0 International License (Creative Commons — Attribution 4.0 International — CC BY 4.0). Users are free to use, copy, distribute, transmit, and adapt the work for commercial and non-commercial purposes, without restriction, as long as clear attribution of the source is provided.
Created by: Yang Su et al.
Curated by: Samapriya Roy
Keywords: Conservation agriculture, Conventional tillage, crop yield, No tillage, No-till
Last updated: 2021-08-30