College of Grassland;
Resources and Environment;
Inner Mongolia Agricultural University;
Hohhot 010018;
China;
Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources;
Hohhot 010018;
China;
Soil and Fertilizer Station of Inner Mongolia;
Hohhot 010011;
China;
Department of Plant Sciences;
Technische Universität München;
Emil-Ramann-Str.2;
D-85350 Freising-Weihenstephan;
Germany;
biochar; bentonite; polyacrylamide; maize; nitrogen loss; nitrogen balance; wheat;