So a soil with a water holding capacity of 200mm will hold an additional 4mm of water. Resistant organic matter: has a high carbon content and includes charcoal, charred plant materials, graphite and coal. Generally, in these soils, organic .matter content is more than 20%. Organic matter is considered integral in the capacity of a soil to maximise water storage through its effect on creating and stabilising soil pores and its absorption capacity. Organic matter improves a soil’s structure by binding soil particles together to form stable aggregates. The water-holding capacity of a grow medium is controlled by its texture, composition, and amount of organic matter content it contains. Water-holding capacities differ greatly among grow mediums. organic matter, the water holding capacity, and the bioavailability of nutrients, it can signi cantly enhance microbial activity and consequently soil aggregate formation and stability ( 22 ). The term field capacity is interchangeably used with the terms the water holding capacity and water retention capacity. Some of the properties influenced by organic matter include soil structure, water holding capacity, nutrient contributions, biological activity, water and air infiltration rate and pesticide activity. In contrast, clay holds great quantities of water, but much of it is unavailable to plants. SOM is also the key energy CHANASYK, AND DJ. In other words, a soil with a high percentage of silt and clay particles, which describes fine soil, has a higher water-holding capacity. Increasing soil organic matter content helps create and stabilise soil structure. Long‐term soil warming can decrease soil organic matter (SOM), resulting in self‐reinforcing feedback to the global climate system. Organic matter acts like a sponge holding more water in the soil. 5. Soil water holding capacity is the amount of water that a given soil can hold against the force of gravity. Raising Soil Organic Matter Content to Improve Water Holding Capacity 4 The Importance of Soil Water Holding Capacity The natural WHC of Florida’s mineral soils is low due to their sandy nature and low OM content. Water is increasingly becoming the most limited natural resource supporting agriculture (Rijsberman 2006), but growers can improve their water storage capacity by raising their soil’s OM content. Data from: Soil Water Holding Capacity Mitigates Downside Risk and Volatility in US Rainfed Maize: Time to Invest in Soil Organic Matter? In contrast, clay holds great quantities of water, but much of it is unavailable to plants. Organic matter adds to a soil’s water holding capacity because humus particles absorb water. There are no commonly agreed thresholds given for soil organic matter. Improve soil structure and water holding capacity. Less water is wicked out of well structured soils - see Fact Sheet 2. Organic matter often increases the field capacity more than the permanent wilting point and it has a positive effect on the available water capacity (Huntington 2006). That’s over 20,000 gallons per acre. Runoff and soil loss immediately after a rainstorm, Naisi catchment. 2:35 Benefits of organic matter in our garden (related to water) Music by Patrick "Compost increases the water holding capacity … Soils with smaller particles (silt and clay) have a larger surface area than those with larger sand particles, and a large surface area allows a soil to hold more water. … Poor structure, low organic matter, low carbonate content and presence of stones all reduce the moisture storage capacity of a given texture class. Soil organisms 61 ... benefits of excellent water holding capacity in the soil, improved organic matter status, more guaranteed harvests, and a more predictable and rewarding farming system. 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