Effects of fertiliser treatments on growth of dyera costulata stock plants and rooting ability of their stem cuttings
2002
N. Lokmal | H. Aminah
Application ofNPK (12N:12P2O5:l7K2O:2MgO + trace elements) significantly improved the heightand diameter growth of potted Dyera coSlulata stock plants compared with those withoutfertiliser. Cuttings taken from non-fertilised stock plants and plants treated with 1 gfertiliser did not differ significantly in rooting but their rooting percentages weresignificantly higher than those from stock plants receiving 5 g fertiliser. The highestrooting percentage was obtained with cuttings from non-fertilised stock plants (66.7%)followed by those receiving 1 g (56.7%) and 5 g (46.7%) fertiliser. However, withoutfertiliser, frequent harvest of cuttings will eventually exhaust the nutrients from thepotted stock plants. In view of this, application of 1 g fertiliser plant'1 monthly may helpmaintain healthy stock plant growth for continuous production of cutting materials.High doses of fertiliser (5 and 10 g plant"1 month"1) are not recommended, beingdetrimental to both survival of stock plants and rooting of cuttings. It was also observedthat high rooting percentages (82%) could be obtained from cuttings taken from nodeposition two.
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