Hydroponics systems have a number of advantages compared with soilbased systems including ability to plant throughout the year, the reduction of pesticide and elimination of nutrient competition by weeds, brings about the fast plant growing (Direck, 2004). Nutrient management is the most important factor for the hydroponic system, especially, nitrogen (N) which is the one of the major nutrient requirements for plant growth. Plant roots can absorb nitrogen in the form of nitrate (NO3-), ammonium (NH4+) and urea [CO (NH2)2] (Osotsapa, 2000). The sources of nitrogen in the nutrient solution for hydroponic system usually use Ca(NO3)2 and KNO3 (Cooper 1975). Even though urea is increasingly being used as the main source of nitrogen fertilizer for crops grown on soil (Gould et al. 1986), however, its use as the N source for hydroponic systems has rarely been reported. One of the reasons is that the urea assimilation has to undergo hydrolysis with the release of NH4+ and subsequent formation of NO3- through nitrification. Hydrolysis of urea proceeds through enzymatic catalysis of urease (Vleket al. 1980). Thus, the objective of this study was to examine the possibility of using urea as the nitrogen source in the nutrient solution for green oak leaf lettuce grown in a hydroponics system.
[EBOOK] Effects of Urea as a Nitrogen Source on Growth of Lettuce Grown in Hydroponic, Junya Uathitirat and Soraya Ruamrungsri, Department of Plant Science and Natural Resources Faculty of Agriculture, Chiang Mai University, Thailand
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Keyword: ebook, giáo trình, hydroponics, aquaponics, hydroponics systems, Effects of Urea as a Nitrogen Source on Growth, urea, nitrogen, thuỷ canh, trồng cây thuỷ canh, dung dịch dinh dưỡng, ảnh huwỏng của urê đến thuỷ canh, ảnh hưởng của đạm đến thuỷ canh
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