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Effects of Nutrient Solution Renewal Frequency on Yield and Quality of Lettuce in Soilless Culture |
LI Jia-jia,SONG Shi-wei,CHEN Ri-yuan,LIU Hou-cheng,SUN Guang-wen* |
College of Horticulture,South China Agricultural University,Guangzhou 510642,Guangdong,China |
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Abstract Through monitoring the pH and EC(electrical conductivity)value of nutrient solution,effects of 3 different renewal frequencies——F10,F15,F30(i. e. the renewal frequencies were 10 days,15 days and 30 days,respectively)of the nutrient solution on the yield and quality of lettuce(Lactuca sativa L.)in soilless culture were studied.The results showed that compared with F10 treatment, no significant variation existed among F15,F30 treatments in terms of aboveground fresh weight,leaf number and other morphological characters,and in contents of soluble protein,VC.The contents of nitrate and soluble sugar were lower in F15 and F30 treatments.The contents of soluble sugar in F15 and F30 were increased.The F30 treatment was better than that of F15.
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Received: 23 March 2012
Published: 01 June 2012
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