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Abstract
The effect of some organic waste mixtures viz., sewage sludge
+ olive pomace (SS-OP) and sewage sludge +tomato residues (SSTR)
on pI-I, organic carbon, total nitrogen and P availability of
sandy and calcareous soils, were investigated. Two surface soil
samples differing in their contents of CaC03, collected from the
Farm of Faculty of Environmental Agricultural Sciences, El-Arish,
North Sinai were used for incubation and lysimeter experiments.
Thus the experiment were performed to investigated the
availability of P in the tested soils and NPK uptake by grown
barley plant, as affected by organic waste mixture treatments,
inoculation with phosphate dissolving bacteria (PDB), and
application of ordinary superphosphate (aSP).
Due to incubating the sandy and calcareous soils with organic
manures (SS-OP, SS- TR), the soil pH values were generally
decreased. The treatment (SS-TR +PDB+OSP) was more effective
in reducing soil pH than others. Also, the soil content of available
P was considerable increased with the aforementioned treatment.
This effect was partly dependent on the type of soil and the
incubation course. At the beginning of incubation course, the total
nitrogen content of the two soils was increased by applying the
organic residues (SS-OP) and (SS-TR) up to 39.5% relative to the
control. Then, the total nitrogen content in the manured soils was
decreasing during the process of incubation. After 50 days from
sowing, the shoot dry weight of barley plant tented to increase over
the control by all treatments. The increases were statistically
significant with the two treatments (OSP+SS-TR5) and (OSP+SSTR5+
PDB). The nitrogen, phosphorus and potassium
concentrations and uptake by plant were found to be generally
increased by all treatments up to 90 days after sowing, comparing
with the control.