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Notes on menurlal eyi:)erin€nt8 
of Sweet Potato. 
The following aimple experiments are conducted from a 
small-holder’s and amateur’s point of view. They are framed 
primarily with a view to ascertaining how far different 
systems of manuring are heat practised in order to obtain 
maximum yields; secondly to indicate and study the various 
dt^flcienoy treatments and see how the results compare with 
other practical manuring systems. 
In e;Q>eriment (1) the special objects of the trial may 
be stated as follows:- 
(a) To determine whether good yields of Sweet Potato 
can be obtained with liberal initial application 
of nitrogenous manure. 
(b) To find out If Sweet Potato yields are reasonably 
good if compost Is used. 
Site. Soil. Plot layout and Planting material. 
The beds were fomed on fairly high ground near an 
Alstonla tree. The section was raised sufficiently high t) 
ensure no disturbance from pirate roots. Drainage was satis- 
factory. Soil conditions were cnmoarable - all the four beds 
were of sandy loam and had had a fair dressing of rook phos- 
phate and burnt paddy husk scirie time back. Beds A and B were 
previously grown with Yam Bean and C and D were under Lesser 
Yam. The four beds were formed of dimension 33’ long end 3’ 
wide in order to provide 3 rows of 33 cuttings each per bed. 
The variety of planting material used throughout was usually 
apical cuttings of Penang White. This jja^tlcular variety Is 
usually constant In yield under any soli condition. 
Manurlal Treatment . 
Treatment A ^-- Mr. Corner’s con^lete artificial fertilizer 
(containing both inorganic and organic 
nitrogen) 2 twelve inch pots 
I 
« B — Rook phosphate •••... 2 ” ” " 
« C — Rook phosphate 2 ” ” 
Compost 2 garden baskets 
^ p Compost 2 garden boskets. 
Management . . 
The control of weeds had to be maintained throughout and 
occasional spraying of tobacco or tuba solution resorted to. 
Results and Discussion . ^ 
It was observed that bed A responded very quickly and in 
10 days after planting the cuttings exhibited large healthy 
leaves twice the size of the leaves grown under the other 3 
treatments. There were no significant differences in growth 
between treatments B, C and D. There were no casualties after 
planting. In the third month after planting all beds showed 
uniform growth. The end of the fourth month saw signs of general 
withering of leaves and the tubers were lifted precisely 17 weeks 
after planting. 
