Plastid pigment content, nitrate reductase activity and nitrate accumulation in lettuce leaves in relation to nitrogen source, fertilizer rate and soil acidity
1997
Stancheva, Ira | Atanosova, Emilia | Dinev, N. | Raikova, Leftera ("N. Poushkarov" Institute of Soil Science and Agroecology, Sofia (Bulgaria))
A study was carried out on the effects of N-source, fertilizer rate and soil acidity on nitrate reductase activity, nitrate accumulation and plastid pigment content in lettuce (Lactuca sativa L.). Plastid pigment content in lettuce leaves increased with the increasing fertilizer rate and beneficial effect of urea N-source on the chlorophyll and carotenoid content was observed in the plants grown in the strongly acid soil. Fertilizer rate of 4g salts per kg soil reduced nitrate reductase activity in all treatments excepting the plants grown in the strongly acid soil and treated with urea as a N-source. Plants grown in the strongly acid soil had the highest NO3- content and reached the acceptable limit concentration at lower fertilizer rate as compared to the plants grown in the weakly acid and middle acid soils.
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