Planting & Soil第 35 / 100 题
Which practice BEST improves drainage in a heavy clay planting bed?
a.Compact the soil before planting
b.Add fine sand only in small amounts
c.Incorporate organic matter such as compost and improve grading
d.Line the bottom of the bed with plastic sheeting
解析
Blending compost and other organic matter into clay improves aggregation, creating larger pore spaces that let water move through. Combined with grading that directs excess water away, this relieves waterlogging. A small amount of sand can actually make clay worse by forming a concrete-like mix, and plastic traps water.
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