الفهرس 
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Abstract
TTO f i e l d experiments were c a r r i e d out on P and Hf e r t i l i z a t i o n a t Sakha 4-gricultural Research and Extecsion Center during t h e seasons of 1982/83 and 1983/% t o study: (1) The e f f e c t of sources, rstes and nethods of placeaent of P-fertilizer on; XEHCO 3 -extrsctaSle P; recovery percentage of P and yield component of ;.iter t. ( 2 ) The r e s i d u a l e f f e c t of 2-fertilizstion on Egypt lan clover. (3) The e f f e c t of l e v e l and t i n e of a p p l i c a t i o n of 9 beside the e f f e c t of a balanced f e r t i l i z a t i o n cmtaining P and K on y i e l d component of wheat. The obtained r e s u l t s can be sumaarized a s fo1loxs:- (A) 2hosphorus f e r t i l i z a t i o n : 1- The EaIiCO 3 -extrsctsble pho~phorusa t differest stages was influenced by both the rhte end sLe for2 of ap?lied ? et tillerin.;, cooti in:^ and l-lsrv e s t i n g stages. It nas 8.6 ppm f o r t h e f i r s t s i t e and 13.4 ppa Tor the second s i t e . There -:Jas e significafit incresse i n a v a i l a b l e ,3 resul:ld from P spplication. $or exaagle the hiaesc r a t e (45 kg P2Gj) r tieed a v a i l a b l e 2 froa 6.5 t o 1-1.13, 12.2 arid 12 u:/g ?or OS?, TSP snd 3AP i’ertilizers, respectively. Availeble 1 declined with tix , e.g. GaEC03-extractable P decreased f r o a 14.3 ppm