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Influence of pre-planting application of dolomite at various rates in coir-dust containing root media on the growth of red-leaf lettuce
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 Title & Authors
Influence of pre-planting application of dolomite at various rates in coir-dust containing root media on the growth of red-leaf lettuce
Kim, Chang Hyeon; Choi, Jong Myung;
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 Abstract
This research was conducted to evaluate various levels of dolomitic lime incorporated as pre-planting fertilizers on the growth of red-leaf lettuce. To achieve this, three root media were formulated by mixing coir dust with expanded rice hull (CD+ERH, 8:2, v/v), carbonized rice hull (CD+CRH, 6:4, v/v), and ground pine bark (CD+GRPB, 6:4, v/v). During formulation, equal amounts of essential nutrients, except dolomitic lime, were incorporated into all root media and the levels of dolomitic lime were varied from 0 to at 1.5 g increments. Seedlings of red-leaf lettuces at the 3rd leaf stage were transplanted into each medium treatment. Crop growths were measured 5 weeks after transplant and soil solutions were collected every week and analyzed for pH, EC, and nutrient concentrations. The treatments showing the heaviest fresh and dry weights in CD+ERH, CD+CRH, and CD+GRPB were 4.5 g, 4.5 g, and of dolomite, respectively. The pHs of three root media yielding the highest crop growths were in the ranges of 6.4 to 7.1. These ECs in CD+CRH medium were around higher than those of CD+ERH and CD+GRPB when application rates of dolomitic lime were equal. concentrations were higher than and concentrations until week 2 in three root media. But and concentrations were higher than concentrations after week 3 in all root media. The concentrations of in all root media got abruptly lower until week 2. These results indicate that appropriate levels of dolomitic lime, as pre-planting nutrient charge fertilizers in CD+ERH and CD+GRPB media, are 4.5 and , respectively.
 Keywords
carbonized rice-hull;expanded rice-hull;pine bark;plant nutrition;
 Language
Korean
 Cited by
 References
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