Articles
RECENT EXPERIENCES IN THE USE OF SUBSTRATES FOR VEGETABLE PRODUCTION UNDER GLASS IN SWEDEN
The increase in the use of mineralwool mats, now highly accepted, and peat, a useful cheap domestic resource, occured at the expence of soil growing, each substrate now occupying about one third of the total acreage.
Limed fibrous peat has become a succesful competitor to mineralwool mats and ordinary basedressed peat, partly due to a low price.
In a recent one-year research comparison, Alsved (1981), a domestic compressed peat board normally yielded as much tomatoes and cucumbers as did a virgin peat block directly cut out of the peat bog and mineral wool.
In another research work, Svensson (1979), different ammonium/nitrate-ratios were compared in a recirculating nutrient solution system with tomatoes (15–35 percent ammonium) and cucumbers (5–20 percent ammonium). The heaviest yields were achieved with 35 and 15–20 percent ammonium respectively.