Properties of cocopeat-based growing media and their effects on two annual ornamentals

A. Yahya, H. Safie and S. Ab. Kahar

Abstract

The physical properties of five growing media (100% cocopeat, 2 cocopeat: 1 sand, 1 cocopeat: 1 sand, 1 cocopeat: 1 peat, and 100% peat) were characterized. The medium water absorbing capacity (or wettability) was highest in 100% cocopeat and the value was reduced proportionately as the composition of cocopeat in the media decreased. Increasing the sand content in cocopeat produced little effect on medium wettability. Pure peat was most difficult to wet. The medium composed of 100% peat had the highest air-filled porosity. Incorporation of peat into cocopeat improved the aeration status of cocopeat. The medium containing 100% cocopeat had the highest container moisture capacity while 100% peat the least. Increasing the sand content in the media aggravated moisture loss; from 1.8% hourly in 100% cocopeat to 2.6% and 6.2% hourly of their initial moisture capacity as the proportion of sand increased from 33.3% to 50.0%. Celosia and marigold plants responded differently to the changing composition of the growing media.

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