Wheat agronomic traits and soil microbial activity were closely shaped by NPK supply. Moderate to high fertilization improved plant height, thousand grain weight and yield, while the number of grains per spike remained relatively stable. Number of Azotobacter spp. and soil dehydrogenase activity increased with nutrient input, ammonifiers increased mainly at higher rates, and actinomycetes did not change significantly. Statistical results confirm the importance of balanced NPK management for enhancing both wheat productivity and soil biology.
Pešić et al. (Thu,) studied this question.