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Nitrate Accumulation in Lettuce(Lactuca sativa L.) and its Nitrogen Use Efficiency.
Nitrogen use efficiency
，葉片的硝態氮含量皆低於 6mM硝態氮處理組，且高低之差距較 6mM硝態
Genotypial difference in nitrate content was found in 28 lettuce cultivars, with the maximum difference cultivar reached 100%. Variation of round tip was found higher than sharp tip type in leafnitrate content. The nitrate concentration of cultivars R8, R13, R43 increased with nitrogen application and rate of enhancement is greater than R14, R24, S25, R37 which identified as low nitrate cultivars. Leaf nitrate contents of 6 cultivars were not found positively correlated with nitrate reductase acticity. Leaf nitrate content and variation in 3mM NH4NO3 solution was lower than 6mM NO3-N treated plants at different time of a day. Six mM nitrogen treatment together with 20% or 50% ammonium-N effectively reduced leaf nitrate content; to the leavels of 24.6%, 33.9% under 50% shading condition with the addition of 20% and 50% of ammonium-N in the culture solution. Fifty percent ammonium-N also increased the dry weight of lettuce by 17%. There were variety difference in nitrogen use efficiency(NUE) with R37 the highest. The NUE decreased with increasing fertilizer application while nitrogen concentration in the culture solution was raised from 2mM to 15mM. R37, R14 were found to be the high NUE and lower nitrate content cultivars.
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