Can gypsum improve water penetration? The answer is probably yes if you are irrigating with low-salt water (canal water) on loam or fine sandy loam soils. The answer is definitely yes if your soil is impermeable because of excess exchangeable sodium (alkali). The answer is probably no if compaction has slowed water infiltration or your soil is inherently impermeable because of fine texture. This article includes recommendations on when and how to use gypsum as an agricultural supplement.

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