Biomass production and nutrient content of temperate cover crops

This dataset has been used to establish reference values for organic matter production and nitrogen uptake of ten common monoculture cover crops. It contains cover crop data from several experiments and years of sampling. Most entries contain data on aboveground or belowground biomass. Later entries also contain data on macro- and micronutrient contents. For some entries the soil mineral nitrogen is available. It is possible that additional meta-data and data from other variables can be found if needed. Data used in the report from the 'Clever cover cropping' experiment was excluded from this dataset. A new dataset (containing this and new data) will be published after 2 years.<br>Version 2 corrections:In v2 errors in different variables have been adjusted: Nmin 0-90 and 0-60 have been removed for all variables since these can be calculated from other columns. Nmin 0-90 after harvest made a faulty sum in v1.Sowing_date_[dd/mm/yyyy] and the Sampling_date_[dd/mm/yyyy] have been adjusted for the references Schroeder et al., 1993, Van Geel &amp; Verstegen, 2008, Van Dijk et al., 1995 Van Geel, 2019 (unpublished) and Van Geel, 2020 (unpublished).Temperature_sum, Moisture_availability[mm], Radiation[MJ/m2], Seeding_rate_[kg/ha], Nmin after harvest, Nmin end nov-dec and biomass variables for the reference Van Geel, 2019 (unpublished)<br>

本数据集用于为10种常见单作覆盖作物（cover crop）的有机质生产与氮素吸收量建立参考基准值。数据集涵盖多项试验及多年采样获取的覆盖作物相关数据。多数条目包含地上或地下生物量相关数据；后续新增条目还补充了大量元素与微量元素含量的相关数据。部分条目包含土壤矿质氮相关数据。若有需要，还可获取额外的元数据（meta-data）与其他变量的数据集。本数据集已剔除‘Clever cover cropping’试验报告中使用的相关数据。包含本数据集及新增数据的全新数据集将于两年后发布。
版本2修订说明：
在版本2中，已修正多类变量的错误：移除了所有变量的0-90cm与0-60cm土层矿质氮（Nmin）数据，因该类数据可通过其他列计算得到；版本1中，收获后0-90cm土层矿质氮数据存在求和错误。针对Schroeder等人1993年、Van Geel与Verstegen 2008年、Van Dijk等人1995年、Van Geel 2019年（未发表）及Van Geel 2020年（未发表）的相关研究，已修正其播种日期_[dd/mm/yyyy]与采样日期_[dd/mm/yyyy]字段；同时针对Van Geel 2019年（未发表）的参考数据，修正了积温、水分可利用量[mm]、辐射量[MJ/m²]、播种速率_[kg/ha]、收获后矿质氮、11-12月末矿质氮以及生物量相关变量。