40 



\ams itKQi'iiMXG Earthing up. 



Year 11) IG. Year 1917. 



X(). of hills 



Area 



l)oiii_i,'' ol' a iR'ctaire 



l)oin,<r of an acre . . 



Sets which failed . . 



Sets wliich grow . . 



I\etiini 



Yield per hectaire 



Yield per acre 



Average jDer hill . . 

 i.e. failures included 



Avera<,fe per ]dant 

 which oTow 



1 



()1 



1 1 SS s(|. feet 



.011 



.027 







Gl 



189259 ojrammes 

 417 Ihs." 



■( 20.").;5() kilos 



(i.<S!) tons 



."ilOo o-rammes 



(i.84l"l)s. 



;no;; grammes 

 (i.S-l'llis. 



51 



918 sq. feet 



.0085 



.021 



3 



48 



153207 fjramnie.s 

 338 Ihs. 



18021.18 kilos 



7.18 tons 



3004 (jramnies 

 6.G3 ibs. 



3192 grammes 

 7.04 Ihs. 



It is distinctly of interest that these up^n'owinu yams which 

 in l'.»K had wide intervals of nine Feet hetween the rows in which 

 they stood (for the convenience of earth.inii' them up) should 

 have returned scarcely more- with these nine feet intervals than 

 they did in the year lUlG when the intervals were five feet; for it 

 indicates th.at the interval of five feet is quite adequate to prevent 

 com])etition hetween the rows under the conditions of soil and 

 climate that they were suhjected to. 



The return of the otlier yams was, as stated already, reduced 

 when in the year 1!»1^ the rows were ajiproximated. 



The yeai' li'll was a very wet one, and the water table so rose 

 in the soil as to make tlie conditions very wet at the lower end of 

 the piece of land use(l. At this lower end were the deeper going 

 yams. I'he yams wei'e in fact jilanted in accordance with the 

 scheme which was proposed as a l)asis for classification in this 

 Bulletin, vol. I, [). 377 in the following diagram. 



1 Short 

 ^ 

 \ 



\ 



2 Half-long 



$. Upgrowing 

 A 



■ > J.ong and deeply burying 



those to the left occupied one bed with the longer at the lower end, 

 and the upgrowing occupied another bed. The first bed had a 

 gentle slope, so that the deeper going were the more likely to be 

 water-logged. 



