We just made two raised beds, 4x6 and 10 inches tall. We added one bag of soil conditioner (from pine bark), one bad of cow manure and the rest are topsoil in each bed. We have been watering once a day for the last two weeks but the plants are turning yellow. We live in central Georgia. Do we need to mulch the plants or is the soil wrong for the plants? We have tomatoes, cucumber, peppers, and squash.