Data for: How much of the world’s food do smallholders produce?

This dataset is a cross-country convenience sample of primary data measuring crop production and/or area by farm size for 55 countries (representing ~50% of global agricultural production). The harmonized dataset is nationally representative but at subnational resolution, sourced from both agricultural censuses and household surveys. The median year of the data is 2013, with a range from 2001 to 2015. The dataset covers 154 crop species and 11 farm size classes (0-1 ha, 1-2 ha, 2-5 ha, 5-10 ha, 10-20 ha, 20-50 ha, 50-100 ha, 100-200 ha, 200-500 ha, 500-1000 ha, and >1000 ha), and is ontologically interoperable with other global agricultural datasets, such as the Food and Agricultural Organization’s statistical database (FAOSTAT), and the World Census of Agriculture. The data set includes estimates of the quantity of food, feed, processed agricultural commodities, seed, waste (post-harvest loss), or other uses; and potential human nutrition (i.e. kilocalories, fats, and proteins in grams per capita) generated by each farm size class. We explain the details of the data set, the inclusion criteria used to assess each data source, the data harmonization procedures, and the spatial coverage. We detail assumptions underlying the construction of this dataset, including the use of aggregate field size as a proxy for farm size, and crop species omission biases resulting from converting local species names to harmonized names. We also provide bias estimates for commonly used methods for estimating food production by farm size: use of constant yields across farm size classes when crop production is not available, and relying on nationally representative household sample surveys that omitted non-family farms. Together this data set represents the most complete empirically grounded estimate of how much food and nutrition smallholder farmers produce from crops.本数据集为覆盖55个国家的跨国便利抽样一手数据集，用于按农场规模分类测算作物产量与/或种植面积，涵盖全球约50%的农业生产总量。经统一协调后的数据集具备全国代表性，且可拆解至次国家级分辨率，数据来源涵盖农业普查与家庭入户调查两类渠道。数据采集年份的中位数为2013年，时间跨度覆盖2001年至2015年。本数据集涵盖154种作物与11级农场规模分级（0-1公顷、1-2公顷、2-5公顷、5-10公顷、10-20公顷、20-50公顷、50-100公顷、100-200公顷、200-500公顷、500-1000公顷及>1000公顷），且在本体层面可与其他全球农业数据集实现互操作，例如联合国粮食及农业组织统计数据库（Food and Agricultural Organization Statistical Database，FAOSTAT）以及世界农业普查（World Census of Agriculture）。本数据集包含各农场规模分级对应的食品、饲料、加工农产品、种子、废弃物（即收获后损失）及其他用途的作物数量估算值，同时涵盖各分级对应的潜在人类营养供给量（即人均千卡热量、脂肪与蛋白质克数）。本文详述了本数据集的相关细节、用于评估各数据来源的纳入标准、数据协调流程以及空间覆盖范围。同时阐释了本数据集构建过程中所依托的各项假设，包括以地块总规模作为农场规模的代理变量，以及将本地作物名称转换为统一名称时产生的作物遗漏偏误。此外，本文还针对两类常用于按农场规模测算粮食产量的方法提供了偏误估算：一是在作物产量数据缺失时，直接使用全规模分级统一的单产水平；二是依赖未纳入非家庭农场的全国代表性家庭抽样调查数据。综上，本数据集是目前最为完整的、基于实证的小农作物粮食与营养产出估算成果。