True or False? Organic matter does not affect pore space in soil.

Organic matter plays a crucial role in affecting pore space in soil. When organic matter decomposes, it contributes to the formation of soil aggregates, which are clusters of soil particles. These aggregates create a network of pores of varying sizes, enhancing the soil's overall structure. This improved structure increases the soil's ability to retain moisture and facilitates air exchange, which is vital for root growth and microbial activity.

Furthermore, the presence of organic matter influences the distribution of pore spaces, affecting both macropores (larger pores that allow for drainage and aeration) and micropores (smaller pores that retain water). Therefore, the idea that organic matter does not affect pore space is incorrect, as it is fundamental to the physical properties of soil, including its porosity and permeability. This understanding highlights the importance of maintaining organic matter levels in soils for optimal health and productivity.