Organic Substrates of Tropical Origin as an Alternative to Growing Media for Lettuce and Cabbage Transplant Production

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  • 熱帯産有機質資材を混合した育苗培地によるレタスおよびキャベツの苗生産

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Abstract

Eight mixed substrates at a ratio of 1: 1 (v/v), namely coconut coir: rice husk (CC: RH), coconut coir: peanut husk charcoal (CC: PHC), rice husk charcoal: rice husk (RHC: RH), rice husk charcoal: peanut husk charcoal (RHC: PHC), bagasse charcoal: rice husk (BGC: RH), bagasse charcoal: peanut husk charcoal (BGC: PHC), peat moss: rice husk (PM: RH) and peat moss: peanut husk charcoal (PM: PHC), were compared with commercial growing media (COM) for their potential for transplant production of lettuce and cabbage. Tha values of shoot length, shoot: root ratio, leaf area, total dry weight and growth analysis parameters of the transplants grown in the substrates containing PHC were higher than those of the transplants grown in the substrates containing RH for lettuce at the last sampling stage. However, the lettuce transplants grew successfully in all the mixed substrates. The cabbage transplants grown in the PM: PHC and CC: PHC mixtures showed higher values for the leaf area and total dry weight than those grown in the other mixed substrates, although the values were lower than those of the transplants grown in COM. Moreover, growth analysis parameters of the transplants grown in the CC: PHC mixture were similar to those of the transplants grown in the PM: PHC mixture. The excessive level of soluble salts in the CC: PHC and BGC: PHC mixtures and high sodium concentration of the substrates containing CC did not affect the transplant growth in either species. The RHC: PHC and CC: PHC mixtures could be recommended for lettuce and cabbage transplant production, respectively, due to their low cost and to their availability in the tropical zone.

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