How should a drip irrigation system be sized according to soil characteristics?

When sizing a drip irrigation system, it is crucial to consider the least permeable soil layer. This is important because the least permeable soil layer determines the rate at which water can move through the soil. If the system is sized based on this layer, it ensures that water is applied at a rate that the soil can absorb without causing runoff or pooling.

Choosing the least permeable soil layer helps prevent over-irrigation, which can lead to water wastage and potential crop damage due to saturation. It also allows for more effective nutrient uptake by the plants, as they are not overwhelmed by excess moisture.

While the largest emitter size or the most permeable soil layer may seem like viable options, they do not accurately reflect the conditions under which the water will be absorbed. Using average soil characteristics could lead to inefficiencies as it does not account for the specific limitations imposed by the least permeable layer.

In summary, determining the sizing of a drip irrigation system based on the least permeable soil layer supports optimal water management and agricultural outcomes, aligning with best practices in irrigation design.