In the last few years soilless cultures have been vigorously developed in Holland. Although many different substrates have been used, rockwool is the most popular. The first Dutch experiments carried out by Verwer at the Institute of Agricultural Engineering in Wageningen used rockwool and nutrient film technique (NFT). Since then many new growing systems have been developed. Nutrient solutions and control equipment have been improved, while investment and annual costs have decreased. Initially, only cucumbers and tomatoes were grown on rockwool and NFT, but now peppers, eggplants, chrysanthemums, roses, carnations, and other crops are grown by this or related systems.
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