1. Marshner, H., Mineral Nutrition of Higher Plants, London: Academic, 1986.
2. Kretovich, V.L., Usvoenie i metabolizm azota u rastenii (Nitrogen Assimilation and Metabolism in Plants), Moscow: Nauka, 1987.
3. Smolov, A.P. and Semenova, G.A., Effect of ammonium concentration on protein and chlorophyll contents and the number of ribosomes in the cells of soybean mixotrophic callus, Russ. J. Plant Physiol., 2008, vol. 55, pp. 359–364.
4. Zernova, O.V., Effects of oxidized and reduced nitrogen forms in nitrogen nutrition on the ultrastructure of photosynthetic apparatus in pea and wheat plants, Russ. Plant Physiol., 1993, vol. 40, pp. 431–437.
5. Edit, T. and Laszlo, T., Effect of NO3
–/NH4
+ ratio on photosynthetic rate, nitrate reductase activity and chloroplast ultrastructure in three cultivars of red pepper (Capsicum annuum L.), J. Plant Physiol., 1992, vol. 140, pp. 298–305.