ISHS Acta Horticulturae 126: Symposium on Substrates in Horticulture other than Soils In Situ
RECENT EXPERIENCES IN THE USE OF SUBSTRATES FOR VEGETABLE PRODUCTION UNDER GLASS IN SWEDEN |
| Author: | G. Granqvist |
| Abstract:
The background, the present situation and recent experiences in growing greenhouse tomatoes and cucumbers in Sweden according to substrates but also irrigation and fertilization management are outlined. 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. | |
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