Study of water holding capacity of difference growing media with coconut coir as the main mixture
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Abstract
The study of water holding capacity (WHC) plays an important role in water retention and maintaining the balance of moisture in the growing media. The objective of this experiment was to study of water holding capacity of difference growing media with coconut coir as the main mixture with the method of laying growing media on the sand. Six seedling media were studied as follows: 1) coconut coir, 2) coconut coir: sand (2:1), 3) coconut coir compost, 4) coconut coir compost: sand (2:1), 5) coconut coir compost: coconut coir (2:1), and 6) coconut coir compost: coconut coir: sand (2:1:1). The study was divided into 2 experiments as follows: The first experiment studied the water holding capacity of growing media with the pressure plate apparatus at 1 kPa pressure gauge. The results showed that the growing media 1-6 had a water holding capacity of 36.54, 18.43, 28.59, 23.05, 30.21, and 28.74 % (v/v), respectively. The second experiment studied the water holding capacity of the growing media by laying the growing media on the sand. The results showed that growing media of coconut coir compost had the highest water holding capacity at 48 hours followed by growing media of coconut coir compost: sand, coconut coir compost: coconut coir, and coconut coir compost: coconut coir: sand at 24 hours, and growing media of coconut coir, and coconut coir: sand at 12 hours. However, different mixtures of growing media affected the duration of water holding capacity differently.
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