This investigation was conducted to investigate the
response of Populus alba transplants to compost fertilization at four
levels and Bio. and/or mineral NPK treatments (control, phosphorein,
effective microorganisms (E.M.), phosphorein + effective
microorganisms, a mixture of Bio. (phosphorein + E.M.) + 75% NPK
and mineral NPK, full dose) on vegetative and root growth parameters
and some chemical constituents.
The obtained results indicated that, transplant height, stem
diameter, whole transplant fresh and dry weights, main root length,
fresh and dry weights of roots, as well as, chemical constituents
including total chlorophylls, percentages of N, P and K were gradually
increased by increasing the levels of compost fertilizer.
Biofertilizers and/or mineral NPK fertilization treatments
significantly increased all the previous parameters. Bio. + 75% NPK
dose followed by mineral NPK (full dose) treatments were the most
effective in this concern.
The interaction between compost and Bio. and/or mineral NPK
fertilization treatments was significant for vegetative and root growth
parameters with the highest values for vegetative and root growth traits
being obtained due to either compost fertilizer in combination with
Bio. + 75% NPK dose or with mineral NPK (full dose)