252 AADIA JuRAL F plat sr Cn. J. Plnt Si. Dwnl frm www.nrrsrhprss.m by 37.44.192.24 n 01/13/18 Fr prsnl us nly. FFCTS OF'SD SIZ O MRC, RAI YILD, AD PIAT HIHT I COR fn rnt yrs n inrsing prntg f rth Amrin rn (Z mys L.) rg hs bn plnt t singl rss hybri s. Sin singl rss s is pru n inbr prnts, it is typilly muh smllr thn s f ubl- r thr-wy rss hybris. Kisslbh (1937), wrking with pn-pllint vritis, shw s siz h littl fft n grin yil. Hwvr, th uthrs wr unbl t fin prvius stuis xmining th ffts f s siz n hybri pllrmn. In th prsnt ppr xprimnts wr stblish t trmin th ffts f s siz n prnt mrgn, rt f mrgn, plnt hight, n finl grin yil. Sin sil tmprturs r ftn lw fr xtn pris f tim, spilly whn rn is plnt rly, w xmin prfrmn t vrying ts f plnting n tmprtur rgims. Plnting pth ws ls intru s vribl. In 197, smpls f lrg s (39 9/100 krnls) n smll s (23 g/l0 krnls) f Pri 11 wr us t stuy th ffts f s siz n rt n prnt sling mrgn, plnt hight, n grin yil. rmintin n mist filtr ppr ws vr 99V fr bth smtl n lrg s smpls. Th fil sign ws split-split plt sign with fur rplitins. Thr ts f plnting, My 9, 19, n 29, mpris th min plts with s siz s subplts. Th sub-subplts wr 2.5-, 5.0-, n 1.5-m pths f plnting. A plt nsist f 0 ss in singl rw.75 m lng. Th sil typ ws ulph lm n whih surf rusting is rrly prblm. Ampl mistur ws vilbl thrughut th mrgn pri. umbr f mrg plnts ws rr vry 2n y bginning2 ys frm plnting n ntinuing until thr ws n furthr hng in stn. Th t whn 5OV f th ss h mrg ws mput s n initin f rt f mrgn. Whn plnts wr pprximtly 30 m tll, th plts wr thinn t nstnt stn f 30 plnts, giving ppultin f 48,200 plnts pr h. On Jun 30 vrg plnt hight f 1 0 plnts pr plt ws rr. Plnt hight ws tkn s th istn frm sil surf t tip f th plnt whn th lvs wr xtn. Plts wr hn-hrvst in mi-otbr n mputtins m t trmin grin yil pr h. S siz h n fft n numbr f ys t 507 mrgn, finl prnt mrgn, r grin yil (Tbl 1). Hwvr, plnts frm smll ss wr shrtr n Jun 30. xplntin is ffr fr th 3.-m ifirn in hight btwn plnts grwn frm th smll n lrg s lts but Kisslbh (1937) bsrv similr phnmnn in pn-pllint vritis. Dspit th ft tht rt f mrgn ws grtly fft by plnting t n sing pth, th lrg n smll s rspn similrly. Th rlir n pr th plnting, th slwr th rt f mrgn. Hwvr, nly t f plnting fft finl prnt mrgn. T furthr tst th ffts f s siz n mrgn, ftril xprimnt nsisting f tw hybris, tw s sizs, thr pths f plnting, n thr tmprtur rgims ws nut in ntrll nvirnmnt hmbrs. Th hybris us wr Sn 155 n Unit 108. Fr bth hybris th 100 krnl wight f th lrg s ws 457 grtr thn th smll s. Prnt grmintin t 25 C Cn. J. Pfnt Si, 52t 252-25 (]s{l 19721
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254 CAADTA JuRAL F plat sr Cn. J. Plnt Si. Dwnl frm www.nrrsrhprss.m by 37.44.192.24 n 01/13/18 Fr prsnl us nly. fr_ll s lts rng frm 9 t 99%. S lts wr plnt t pths f 5, 10, n 15 m in 30-m im pts. Twnty-fiv ss wr plnt pr pt in 31 1 sil mixtur f ulph lm, rs sn, n pt. Th mixtur ws ls n fribl with littl r n tnny t rust t th Jurf. Pts wr pl in h f thr grwth bints with ytim tmprturs f 13, 2r, n,32. ight tmprturs wr ru 5 grs C. Th numbr f mrg plnts ws ult ily until th numbr f plnts pr pt rmin nstnt fr 5-y pri. A plnt ws nsir t hv mrg whn ny prt f it brk thrugl th sil surf. Th mrgn rt ws lult by mith similr t tht f Mguir (192). In ur s grmintin rt wi lult by iviing th prntg f slings tht mrg h y by th numbr f yi frm sing t mrgn. Th vlus btin t h unt wr thn summ t th n f th tst t btin th grmintin rt. Th frmul is s fllws grmintin rt x,/y, (x,-x,)/y"! (x"-x,,-,) /y", whr x' = prnt f slings mrg t th nth unting t, n y" numbr f ys frm plnting t nth unt. Unr nitins f ntrll tmprtur w fun s siz h n fits n prnt mrgn (Tbl 2). Dp sing f Sn 155 rsult in rs in mrgn t th lw tmprtur. whn bth th lrg n smll s f Sn 155 wr plnt t 15 m pth in th l hmbr, nly 0V f th s mrg. Fr bth s sizs this inlu numbr f siings tht mrg irrgulrly. In suh instns th lptil, whih nrmlly rmins intt until ftr plumul mrgn t th sil surf, ruptur blw th surf n th first lf xpn unr grun. Th xpn lvs i nt hv th prpr grwth hbit t pntrt th sil surf. Hwvr, mny f ths plnts i mrg bus th xpning lf ws pbl f fring itj wy t th sil surf. Ths wr th nly tw trtmnts in whih th prnt mrgn fll blw th 80-90% mmnly pt in mmril prutin. Th prnt grmintin n filtr ppr t 25 C givs n initin f th mrgn iffrn th!_tw1 tw hybris. Th pr mrgn f Sn 155 whn plnt t 15 m in th l nitins my rflt vribility btwn gntyps in lptil lngtin rthr thn s vibiliqu. nti iffrns hv-bn prviusly rprt (Dungn 1950; Mll t l. 199). s siz h n ffts n rt f mrgn rgrlss f hybri, plnting pth, r tmprtur rgim (Tbl 2). Rt f mtgn rs rmtilly with rs tmprtur. Dys t 5V mrgn wr 4,5, n 13 fr th high, mium, n lw tmprtur rgims, rsptivly. Dpr plnting ls inrs th numbr f ys until mrgn, prtiulrly t lw tmprturi n with Sn 155. - rn summry, s siz h n fft n th rt r xtnt f mrgn. Th pr th s ws plnt n th lwr th tmprtur, th lngr th pri t mrgn. Prnt mrgn ls rs slightly with inrs pth f plnting.., nly th t f plnting fft fil yil prfrmn. H^wvr, plnt hight n Jun 30 ws ltt by pth f plnting n tim f plnting. Plnts frm smll s wr shrtr thn ths frm lrg sl. Th finnil ssistn f th Ontri Dprtmnt f Agriultur n F is grtfully knwlg.
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25 CAADIA JOURAL OF PLAT SCIC DUA,. H. 1950. Rspns f rn t xtrmly p plnting. Agrn. J' 42 25-257. KISSLBACH, T. A. 1937. fit f g, siz n sur f s n th rn rp. b. Agr. xp. St. Bull. 305 1-1. MAUIR, J. D. 192. Sp f grmintin-i in sltin n vlutin fr sling mrgn n vigr. Crp Si. 2 17-177. MOLL, R. H., LVIS IlI, C. S. n STUBR, C. W. 199. nti vritin in miz lptil grwth n its rltinship t th uxin rgultry systm. Crp Si. 9 22-24. Cn. J. Plnt Si. Dwnl frm www.nrrsrhprss.m by 37.44.192.24 n 01/13/18 Fr prsnl us nly. R. BRUC HUTR n L. W. KABR Crp Sirt Dprtnlnt, (Jttirsit1'l ulplt, ulph, Ontri. Riv lun 15, 1971, pl v. 22, 1971.