الفهرس 
Irrigation effectOnly 14 pages are availabe for public view
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Abstract
The e f f e c t s of irrigution rl Ips, inoculrition tlnd nitrogen levels on growth, seed y~eld, yield components and seed chemicn.1 composition of t h e soybe~in eve C1r3r.k (Glycjn e -mr*x (L. ) Merrill) were s t u d i e d dur-f rip, t h e ser- sons of 1980 nnd 1982 . Fie1.d work and l a b o r a t o r y testa were carrted out In t h e 3’uculty of Ag r i c u l t u r e , T~ntaU niversity at X~fr El-Sheikh. The s e l e c t e d a r e a s were studiee to determine the s o i l bulk d e n s i t y , f i e l d capacity and permanent wiltinc point. The seeding date was June 17, 1980 nnd 1:luy 7, 1982 . T~ePx periment61 d e s i g n w a s s p l i t - s p l i t p l o t w i t h f o u r r e p l i c a t e s . The main p l o t s were randomly assigned to three i r r i g a t i o n regimes, t h e sub-plots t o two i n o c u l a t i o n treatments and sub-sub p l o t s t o three nitrogen l e v e l s . I r r i p n t i o n w a s applied nt 25 %, 50 % and 75 ?g d e p l e t i o n of avr~ilables o i l mu~stur(eD AM). Inoculnti on tzrecl tments were inoculated soybean seed with Rizobiurn juponicum and uninoculated. Nitrogen l e v e l s were 15, 30 and 45 kg M/ feddan . The measurements of growth c h a r a c t e r i s t i c s wpre t~ikell et 43, 48, 53, 58, 63 and 73 days from sowinp. The re.sults obtnined can be summarized as follows : Abundnnce of’ t%vrlilrzble s o i l moisture i n the root zone signif icrtntly increased f r e s h weight per plant at most sampling dates. The inoculated p l a n t s produced s3,gnificuntly high.er f r e s h weight t h a n d i d t h e uninocul a t ed plants FL~t h e f i r s t and the last two sampling dates i n 1980, only . The same trend’waa observed at the o t h e r dates i n that season and a11 dates i n 1982, but t h e d i f f e r e n c e s were not sign3fiaant Nitrogen l e v e l s exhibited s i g n i f i c a n t d i f f e r e n c e s j n f r e s h weight except at 53, 58 und 63 days i n 1980. The 45 kg N/fed. produced the g r e a t e s t f r e s h weight, w h i l e the 15 kg N/fed. gave the lowest. 2. D r y matter accumulation (g/plant): The increase of e i t h e r s o i l moisture i n thc rool, :mnc o r nitrogen l e v e l brought out s i g n i f i c a n t increases in dry matter production at most sampling dates i n both seasons. However, the inoculated p l a n t s were s u p e r i o r t o uninocul~ ted ones i n dry matter accumulation and reached the l e v e l of s i g n i f i c a n c e at 43, 63, and 73 duys i n 1980 season only . 3 . D r y matt~rd .istribution : Dry matter percentage of shoots incrensed signl t’ic:~ntly cith t h e i n c r e a s e of av~ilubles o i l moi sturc: e x c e p t itt t h e first date i n 1980 and at the first three dates 2t 1982, No d i f f e r e n c e s i n the percentage of dry matter i n shoots between t h e two i n o c u l a t i o n treatments were recognized. 2t-t most of t h e sampling dates i n both seasons, t h e 15 kg N/fed, produced s i g n i f i c a n t l y lower percentage of shoots Lhsn d i d the two o t h e r r a t e s which were not d i f f e r e n t 1:foisture s t r e s s and deficiency of nitrogen l e v e l led t o an increase In percentage of dry matter i n form of recovered r o o t s , while i n o c u l a t i o n did not exert any s i g n i f i c a n c e i n this respect . kt till s~impling d a t e s , i r r i g a t i o n ut 25 ;!!, IhiIsI produced t a l l e r p l a n t s than i r r i g a t i o n at 75 % DxLI. Plmt height was not affected by inoculation. Except at the f i r s t and lasz sampling dates i n 1980, the 15 kg N/fed. produced s h o r t e r plsnts than did the two o t h e r r a t e s which were not d i f f e - r e n t.