الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
’to investigate theeftact of Caco3 content and the
added fertilizers on extractable tcrl;~sof soil ¥m, especially
the available f’orf:is. this work ’too’aS carried out J using eight
different soil s9.!Jples d.ifferent in their che::lical and physi-
54
cal properties • Rad10activa- Mnwas used for ensuring
quite accurate and. r:~oreprecise results.
1)
The obtained results can be sw·..l:.Jarized as follows :-
clearly
The results inC:l eated th~t the 1m content of’.
all extractable for~ was tr~~endously low in the calcareous
soils co~~ared to the alluvial ones •
With respect to the calcareous soils, the
values of exchangeable, easily reducible and total
enractabl e iJInwere signifi cantly reduced, as the
so11 contetn of Caoo) increa.sed. l·ioreoverI the
oc~nceof CaCO)in the fine particles. 1.e.,
.::. 2 i1 t increased clearly its capability to
reduce ~e level ot extractable l~ J especially the
exchangeable lin •.
aegarding ~he alluYia1 sails, 1~ was quite
obvious th8t., in general I the forl”~sof different extractable
14n tended to increase with increasine the
level of soil fine particles and the organic l1atter ·
contents in these soils •
Add.ition of N to the calcareous soils at two
rates ::i1 not affect the ton] of water soluble
NIl • However, the second level ( 60 KgX/Fed)
increased significantly this for~ of soil ~~
in the alluvial seils •
The application of N ’showed no effect on exChangeable
~min calcareous soils, but signiric~
tly decreased. this for~ in the alluvial_ The easily reduci’.:>le ~inwas negatively arre-
-
ct.ed, ”,rhila I the organic-associated ~qn forLl
was p~s1tivelY affected by N addition to both
calcareous an~ alluvial soils •
Nitrogen application to calcareous soils increased
the total extractable Mn. In the alluvial
soils; hO~;leVert a. contrary 1;rend was
o~ned •
-7i1-
_ Phosphorus application showed no errec~ on
water soluble !.1nin the calcareouS soils.
bu~ increased this fraction in the alluvial
..•
ones.
n The addlti0n of P uaterially increased the
exchangeable loin in calcareous soils; in the
alluvial soils, this fraction was signiflcantly
decreased •
_ The easily reducible ~mwas ne~atiYely altacted
.•’1..t•h .p addltlon to calcareous soils
a.t beth ra.tes • However, this rec.uctlOD was
observed in alluvial soilS, onl1 w1~hthe
second level.
_ The org~nie-a5sociated an~ t~tal extractable
~mforos were increased ~~tb P addition to
both calcareous and allu~ial solls •
q.) P.~J:Ei!!g~~ :-
_ Zinc application ( at the rs.te of ,. Kg 7z1/Fed.)
~/soUs
to either the calcaraQus or the alluv1a~ slgniti.
antly increased the water soluble lwjn •
and alluvial soils •
- The organic-associated vm increased ~~th the
ad(iticn of, Cu to both calcareous and alluvial
soils •
• Copper a~Gition at either rates to the calcareous
soil tended to increased the total
axtractable ~~’in• H::>,”levert this effect was
detected in the alluvial soils only with the
second level of Cu addition.