الفهرس 
Effect of manganese on field beansOnly 14 pages are availabe for public view
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Abstract
experixznts vicre conducted a t Snkha A~ricult~ral Research Station ?arm during each of the two successive seasons 1577/’78 clxl 1978/79 t o study the e f f e c t of 2,4-DB, ih SC,, and Zil 50, on t.ic prccrt-gn of flower and pod L. shedding on tllc main stem yield and its components and seed quality of Giza 1 field beans v a r i e t y . 2,lev els: 0.20 ~nd40 ppm, were use2 i n combin a t i o n wit11 Mm SO 4- levels of 0, 1000 and 2000 pprn, i n the f i r s t experiment. The sane levels of 2,$-DB were combined wi t h Zn SC4 levels of 0, lGOO and 2000 pprn, i n t h e second experiment, 2,4-DB was sprayed immediately before flowering i.e. a f t e r 45 and 50 days efter sowing i n first and second season, respectively, Xh SO 4 and Zn SOL!- spraye6 on the next day. A E’actorial experiment in a complete randomized block design with four replicates was used i n each experiment’. The combined anal-ysia was conducted between two years to some iin:?.3rtant. characters. TIie planting dstzs were Bovember, 16 and Xov. 18 i n tile first 8nd thz second season, respectively. The results are summarized as f o l l o w s : I- I;’loyer and pod A&- she- -on t-h -e -m ain- -s t.e-m- : 1- I!’lo~er shedding, the level of 40 ppm 2,4-D3, resulted i n &ri i~creasei n the rium’ber o f floners and the percentage of sheGding, while 20 ppm 8id not d i f f e r from the control. i5n SO 4 levels caused E! significaxt effect orr nurrher of flowers. On tile otlicr I,T:~Z: hi,f-,T ,rpe nces i n the percentage of shedding were n o t significar~,t Also, tile i n t e r a c t i o n e i t h e r alone o r i n co;n1~inationn i.til 2,4-DB on number and shedding of flowers ir!ere not s i g n i f i c a n t , 2- The e f f e c t of 2,4-DB l e v e l s a s wel l as &in SO1,’ ,, Zn SOS and the interactions between 2.4-DB and each of i<a SO4 or Zn SOq on uber of young - set pods and percentage of shedding were not significant . 3- With respect t o percentage of t o t a l shedding a s l i g h t decrease was observed a t 20 ppm 2,J-DB, wliile at 40 ppm -. a s l i g h t increcoe was observed. However, 2, &DBI Mn SO4, Zn SOL ,i, and their intesact&ons between 2,4-DB a.nd each of 1’11 90 o r Zn. SO,, levels weye not affected s i g n i f i c a n t l y 4 on t o t a l shedding. 11- Yield and its compo~ents: L._-_I-IL--Y---^I.YY-_. 1- Plant height at harvest as well zs nuinber of priimry and secondar>r bya;ches/plant were not affected s i g n i f i c a n t l y by spraylng 2, +Dl3 9 I!h SO4 , Zn SO. on2 the interaction ’t between 2,4-DB 2x16 d!h SO 4 o r Zn SO,!. l e v e l s . 2- Rxaber of xature pods/plmt increased s i g n i f i c a n t l y by adding 2,4-DE a t rate 20 ppm, and decreased at- mt-e of 4-3 ppix than the control. The level of 2000 ppln Mn SO 4 increased ti12 liulxber of pods signific~ntly i n -the second seasori an6 combiiled an~lgsi.s The c ouiibine6- treatment of 20 ppm 2, -B and 2000 ypm ih SOS gave the highest number of pods per plant, Also, at rate of 1000 ppln Zn SOji the nu~ibcr 02 pods!’plant highly significant, incrr 000 pp s~2t2 e cont rol . %ion ~f 2G ppm .2,4-313 ar,d 1000 ppm caxtly Ilxcroaced i;hen the other coiribinat- 3- The number of seeds per plant were highly s i g n i f i c a n t l y increased a t the level of 20 ppm compared with the control and ArO ppm 2,4-D3, I-i; was observed that the nwnber of soeds/plaat increased at 2000 ppm ilk SO4 i n comparison wi th the con-trol and th~le ~~oef l 1000 ppm. Tlie increase was highly significant only i n the second season. The combination between 20 ppm 2,4-DB and 2000 ppm Mn SOit gave high number of seeds. The effect of Zn SO4 levels on number of seeds/ plent was highly s i g n i f i c a n t . Xoreover, the level of 1000 ppm caused a higher increase i n t h i s as2ect compared with the control and 2OOG ppm. The combined t r e a t - ment of 20 ppm 2,4-El3 and 1OOG ppm Zn SOS caused the highest increase and the increase was significant only i n the second season. 4- The e f f e c t of 2,4-DB, Iih SO 4 or Zn SC4 on number o f seeds per pod and 100 - seed weight - were not significmt, except i n the second season were the two levels of Zn SOS incremed 106 - seed weight s i g n i f i c a n t l y .