Reuse of peat bags for tomatoes and cucumbers

Summary Growing tomatoes in low humified Sphagnum peat gave satisfactory results when using the peat bags in three successive seasons without any sterilization. Use of a complete nutrient solution showed an increase of phosphorus and boron from one season to the next. The pH varied with the electrical conductivity in the peat, dependent on the nutrient concentration used. The solution used for reused peat should have a lower content of phosphorus and boron compared to a solution used for one season peat.The air capacity is high and have to be considered as optimal also in reused peat. The effect of reusing the peat on physical properties as porosity and pore size distribution is therefore of no practical significance.