2026-10-10T16:54:24Z https://www.scidb.cn/oai

10.57760/sciencedb.IGA.00728 2023-11-06T16:06:55Z

2023-11-06 Helen City 1:250000 Grain Production Distribution Dataset (1990) doi:10.57760/sciencedb.iga.00728 en a. Data content (data file/table name, including observation index content) Data File Name: Hulun City 1:250000 Grain Yield Distribution Dataset (1990) Main content: HlCereal1990- Data entity.shp b. Construction purpose This dataset mainly provides data support for the study of the evolution and degradation process of black soil quality. c. Service object Students and researchers engaged in research in soil science, agriculture, and agricultural ecology. d. Time range of data The data source was in 1990 and was produced in 2006. e. The spatial range and projection method of data Space scope: Hailun City, Heilongjiang Province Grain Production Distribution; 1990; Helen City 杜书立 PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset Science Data Bank