ISHS Acta Horticulturae 761: XXVII International Horticultural Congress - IHC2006: International Symposium on Advances in Environmental Control, Automation and Cultivation Systems for Sustainable, High-Quality Crop Production under Protected Cultivation
EFFECTS OF REUSE OF ORGANIC SUBSTRATE ON GROWTH AND YIELD OF STRAWBERRY IN SOILLESS CULTURE |
| Authors: | H.S. Yoon, Y.H. Hwang, C.G. An, H.J. Hwang, G.M. Shon |
| Keywords: | strawberry, soilless culture, organic substrate, reuse, expanded rice hull |
| Abstract:
Plants of short day strawberry (Fragaria × ananassa Duch. ‘Akihime’) were grown in a raised bed filled with peatmoss, perlite and expanded rice hull in the ratio of 3:4:3 (v:v:v). This substrate was either newly prepared (new substrate) or already used in one, two or three previous cultures (1-year used, 2-year used, and 3-year used substrate). The reused substrate was treated with steam sterilization. When the substrate was used in succession, the bulk density and water capacity gradually increased from 170 kg m-3 to 220 kg m-3 and from 38.9 to 57.3% (v/v), respectively. But, the air capacity linearly decreased from 44.3 to 20.9% (v/v). These results were probably due to decomposition of expanded rice hull. The easily absorbable P, K, Ca and Mg were higher in the reused substrates than in the new substrate. Plant height and leaf size in the reused substrates did not differ with those of the new substrate. As the substrate was used more than once and up to three times, marketable yield greatly increased from 544 to 609 g per plant. However, fruit yield began to decrease on the 3-year used substrate. Fruit qualities were not affected by the reused substrate. Total expense of renewing substrate every year amounted to 3,041,000 Korean Won per 10 a. With all extra materials and labors for disinfection and rearrangement, the expenses on the 1-year, 2-year and 3-year used substrate were equivalent to 67%, 55% and 50% of that of the new substrate. | |
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