Biological Properties (Leaving Cert Agricultural Science): Flashcards

Community of bacteria, fungi, protozoa, actinomycetes & algae

Decomposition, nutrient cycling, N fixation, disease suppression

They reshape soil by creating tunnel networks

Decomposed plant & animal materials in breakdown stages

Faster decomposition, reduced OM, poorer structure & fertility

Maintains higher OM levels, better structure & fertility

Bacteria convert atmospheric $N_2$ gas into $NH_3$ (ammonia)

Bacteria convert $NH_3$ into $NO_2^-$ (nitrite), then into $NO_3^-$ (nitrate)

Active soil zone immediately surrounding plant roots

Dramatically increase nutrient uptake, especially phosphorus