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- [6] SUMMARY OF SOIL FERTILITY LEVELS FOR NORTH-DAKOTA - 1972-1981 NORTH DAKOTA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1982, (512): : 1 - 12
- [8] Soil indicators of agricultural impacts on northern prairie wetlands: Cottonwood lake research area, north Dakota, USA Wetlands, 1999, 19 : 56 - 64
- [9] FORAGE ESTABLISHMENT AND SOIL FERTILITY ON A RECLAIMED MINE SPOIL IN WESTERN NORTH-DAKOTA NORTH DAKOTA FARM RESEARCH, 1983, 40 (06): : 22 - &
- [10] RESEARCH ON SOIL FERTILITY IN THE EXPERIMENTAL FIELD AT THE MOARA DOMNEASCA EXPERIMENTAL STATION SCIENTIFIC PAPERS-SERIES A-AGRONOMY, 2021, 64 (02): : 34 - 39