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PENGARUH SUHU ZONA PERAKARAN TERHADAP PERTUMBUHAN DAN KADAR KLOROFIL TANAMAN SELADA SISTEM HIDROPONIK
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Amount of oxygen able to be dissolved in nutrient solution decreases with increasing temperature. Insufficient oxygen reduces the permeability of roots to water and there will also be an accumulation of toxins. Both water and minerals cannot be absorbed in sufficient quantities to support plant growth. The objective of this experiment was to get optimum nutrient solution temperature for the best growth and chlorophyll content in lettuce. The setting at 15, 20 and 25 oC artificial temperatures in nutrient solution or rooting medium with NFT hydroponic system were conducted. The temperature levels (15, 20 and 25 oC) and daily effective time (4, 12 and 24 h) as treatments were put in the factorial experiment design. There are relationships between temperature and electrical conductivity and oxygen dissolves (predicted). Increasing in nutrient solution temperature caused increasing in electrical conductivity. In contrast, increasing in temperature was predicted decreasing in oxygen dissolve in medium or rooting zone. There is crossing point of two regression lines between 25 to 30 oC in temperature, where were found positions of electrical conductivity between 2.5 to 3.0 mS and oxygen dissolve between 7 to 8 mg.L-1. More dry matter and chlorophyll content of lettuce were found in about 25 oC of nutrient solution temperature which was controlled at the day only. Key words : lettuce, temperature, root zone
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