MINERALS CONSTITUENTS, TOTAL FREE AMINO ACIDS AND NITRATE REDUCTASE ACTIVITY OF POTATOES (Solanum tuberosum, L.)AS AFFECTED BY BIO-AND MINERAL FERTILIZERS . | ||
| Journal of Plant Production | ||
| Article 15, Volume 34, Issue 3, March 2009, Pages 1953-1967 PDF (703.5 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2009.116963 | ||
| Authors | ||
| M. N. Helaly; E. A. Ramadan | ||
| Dept. of Agric. Botany, Fac. of Agric., Mansoura Univ., Egypt. | ||
| Abstract | ||
| During the two growing seasons, nitrogen, phosphorus and potassium concentrations and their content of potato shoots were negatively affected by decreasing NPK dose less than the recommended one (control).However, bio-fertilizers application, overall NPK dose, significantly increased N, P and P concentrations and their contents. The most effective strain was found with NFB when used individually or incombination with the otherstrains used. Therefore, NFB+PDB+SB recorded high values regarding N, P and K concentrations and their content. The interaction treatments, indicate that, bio-fertilizers counteracted the depressing effects of NPK stress and showed an increase in N, P and K concentrations and their content in potato shoots. On the other hand, No3-concentration and nitrate reductase activity (NRA ) were decreased whereas, free amino acids were increased. Inoculation with the three bacterial strains used recorded best results in this respect. | ||
| Keywords | ||
| Potato; biofertilizer; NPK fertilizer; NRA | ||
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