EFFECTS OF LONG TERM IRRIGATION USING MIXED NILE WITH DRAINAGE WATER AND ORGANIC FARMING MANAGEMENT ON SOME PROPERTIES AND FERTILITY OF SOME FAYOUM SOILS, EGYPT

Document Type : Research articles.

Authors

Soil and Water Department, Faculty of Agriculture, Fayoum University.

Abstract

Objectives of the present work were to study the effects of long
term (< 10 years) use of mixed Nile with drainage water in irrigation and
organic farming management in some Fayoum Governorate soils on
plant essential macro and micro nutrients availability and some soil
characteristics.
Six soil profiles were excavated to achieve the first objective:
three of which at an area irrigated with fresh Nile and three represented
soils irrigated with mixed water. Two other profiles were dug in a
private farm at Ibshaway, Fayoum: one from a long term (<10 years)
organic managed filed and the second represented in a conventional
managed field at the same area.
The use of mixed Nile with drainage water resulted in great
increases in the mean values of soil salinity expressed as ECe values and
the concentrations of AB- DTPA extractable P, K, Fe, Mn, Cu, Zn and
hot water extractable NO3 – N.
Soil cultivated under organic farming system for <10years had
less salinity and slightly less pH values and contained more extractable
available N, Fe, and Cu and less Zn, Mn , and P than soils of the
conventional managed field. The concentrations of hot water extractable
- N were found below the critical deficiency limit in all the studied soils.
AB - DTPA extractable- Zn concentrations were below its critical
deficiency limit in most soils or within the deficiency range in some
others. Concentrations of all other nutrients ranged between deficient or
sufficient depending upon quality of irrigation water, soil depth and
management system. Means of extractable concentrations of all the
studied nutrients generally decreased with soil depth down to 90 cm in
all the studied soil profiles.

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