The present work was carried out during the two successive seasons of 2018. and 2019 to
assessment the influence of filter mud as organic manure and some micronutrients, as well as, their interactions
on plant growth traits and chemical constituents of neem (Azadirachta indica) seedlings. Filter mud was applied
to the soil of neem seedlings at the levels of 0, 30, 60 and 90 g/ seedling. Micronutrients applied namely, zinc
(Zn) as ZnSo4.7H2o and manganese (Mn) as MnS04.H2o. The seedlings were sprayed with these nutrients as
follows: control (0), 50 ppm Zn, 100 ppm Zn, 50 ppm Mn, 100 ppm Mn, 50 ppm Zn + 50 ppm Mn and 100 ppm
Zn + 100 ppm Mn. The obtained results showed that the use of filter mud at all levels resulted a significant increase
in stem length, stem diameter, leaves dry weight seedling, stem dry weight seedling and the three examined
elements of N, P and K% in the dried leaves, except for the low level of filter mud (30 g/ seedling) regarding stem
diameter in both seasons and also stem dry weight, in the first season. Clearly, applying the high level of filter
mud (90 g/ seedling) gave the highest values of these previous traits. Obviously, foliar spray with Zn or Mn either
single or together led of significant augment in above mentioned parameters, except for Zn at 50 ppm for both
stem length and stem diameter, in the first season, as well as, 50 ppm Mn for leaves dry weight, in the first season
and 50 ppm Mn for stem dry weight, in the second one. The highest values of the studied traits were detected by
100 ppm Zn + 100 Mn. The listed data indicated that the interaction effect was significant on all examined
characteristics. Apparently, most combined treatments significantly augmented all tested aspects. Obviously,
supplying the seedlings with filter mud at the high level (90 g/ seedling) plus foliar spray with 100 ppm Zn + 100
ppm Mn achieved the highest values of the studied traits.