Content of mineral nitrogen forms in the soil treated with slurry, manure and NPK on the basis of fourteen-year field experiment
1987
Mazur, T. (University of Agriculture and Technology, Olsztyn Kortowo (Poland))
Application of cattle slurry, farm manure and commercial fertilizers to the soil increased its mineral content by 27 to 49 percent. NH4-N averaged 59 percent of the total content of mineral N but its proportion varied over the study period. Soil mineral nitrogen varied from month to month and from year to year
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