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Abstract
Great amount of planted crops in wide areas of Egyptian soils suffer from decreasing the level of potassium content in soils
For this purpose it was so interesting to investigate the different phases of potassium in Egyptian soils and studying different relations between different potassium phases. Twenty two soil samples which represent six profiles from different soils were collected. Three profiles from Kafer El-Sheikh which represent alluvial soils, two profiles from Halaib (Daeght and Sermatty) valley which represent sand soil and one profile from Borg El-Arab in the north coast which represent calcareous soil.
This study revealed that, there was variation in the mean values of different potassium forms or status in soil.
- The order of these means were as follow:
Total>Available>Exchangeable>Soluble potassiur
- There was variation in the mean values of different potassium forms or status in the alluvial, sand and calcareous soils.
The order of exchangeable, available and total potassium mean values in the different soils were as follow:
Alluvial>Calcareous>Sand
The order of sum for all extracted potassium values were with boiling nitric acid (reserve K) in different soils were as follow:
Alluvial > Calcareous > Sand
- Constant rate potassium (C.R.K) gave the following order:
Calcareous>Alluvial>Sand
- Finally it was cleared that the impotence of putting special potassium fertilization policy in sand and calcareous soils.
Key words:
potassium-status-cxchangeable-reserve-fixed-texture-organic matter (OM) -soluble-available-clay-sand-silt-Egypt.