I had a question about applying gypsum prior to bedding before planting rather than at flowering and pegging. My answer is that gypsum needs to be applied at pegging. A preplant application would result in broad distribution of gypsum throughout the soil profile in areas where it is not needed for kernel development. A relatively high concentration of calcium is needed in the pegging zone (upper two to three inches of soil) in July and August. This ensures that adequate calcium moves into the developing pegs and pods with soil water. The plant cannot provide adequate calcium (through leaves to pods or through roots to pods.) Even with logistical challenges, it is critical that a high concentration of calcium in a water-soluble form is in the pegging zone. Gypsum delivers this.