To prevent salt buildup around plant wetting patterns, patterns should be ______.

• A. floaded
• B. subsurface
• C. misted
• D. overlapped

Answer: (D)

The key idea is to keep the soil around the plant evenly wetted so salts don’t accumulate at the edges of individual wetting areas. When irrigation leaves dry pockets between patterns, water evaporates from those dry zones and salts are left behind, creating high-salt spots that can harm roots. If the wetting patterns are overlapped, the edges of one pattern merge with the next, eliminating dry strips and ensuring uniform moisture. That consistent moisture movement through the root zone also helps flush salts deeper into the soil with each irrigation cycle, preventing buildup at the surface or near the plant. In short, overlapping wetting patterns ensures complete coverage, steady soil moisture, and reduced salt deposition where roots extract water.