الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
A field experiment was conducted in Nabteet area, Al-
Sharkia governorate to evaluate the effect of application of four
soil amendments singly or in different combination. They were
gypsum (G), sulfur (S), farmyard manure (FYM) and sand (D).
They were applied to a saline sodic clayey soil (EC=19 dS m’,
ESP=43) pre-leached to decrease its salinity. Application of
amendment was followed by growing wheat crop (Triticum
aestivum) c.v. Sakha 93 during 2005/2006.
The experimental field was pre-leached (by a continuous
leaching process) to decrease its salinity. An open drain was dug
to support the leaching process. Leaching was conducted by
adding water to soil basins until it reaches a height of 15 em
above the soil surface. Such height of water was kept constant for
3 days. The collected drainage water was removed using a pump.
Salinity decreased to 15 dS m’ and sodicity to 41 ESP. One week
after the leaching the land was divided into plots 16 m2 and then
soil amendments were added, followed by cultivation.
After wheat harvest, grain and straw yields increased, and
salinity, exchangeable sodium percentage and soil pH decreased
due to amendments addition. Available P, K as well as
aggregation and porosity increased by adding amendments.
The highest grain yield (3284 kg fad”) was given by G
alone, whereas the lowest grain yield given by amendments (1082
kg fad”) was given by S alone. Application of sand alone caused
a considerable increase in grain yield by an average of 177%, the
practical implications shows that gypsum is the most efficient
amendment, and that sand may be a viable amendment with low
cost.