A STANDARDIZED POTATO TRIAL. 
131 
Professor Seton's opinion regarding. We should all apply the same 
dressing in the drills when planting in spring. 
" Will you kindly let me know if you are prepared to receive the 
400 tubers now and box them ? If all can do this it would add another 
point of uniformity to the Trials. 
" Yours faithfully, 
" W. CUTHBERTSON." 
In February I wrote as follows to each : 
" Manuring. — Professor Seton (with whom I discussed the matter 
of artificials last week) and I decided that all should have a moderate 
dressing in the drills at planting time if potash could be got. I have 
secured some potash (45 per cent.), and I hope to send you later a 
little bag of manure worked out on the basis of 1 cwt. sulphate of 
ammonia, 4 cwt. superphosphate (26 per cent.), and 1 cwt. potash 
per acre. Each trial plot should extend to about 200 square yards- 
The produce will become the property of the experimenter. 
" Should any of the tubers sent you have suffered by the recent 
frost, please let me know and I will repeat them if possible. 
" Yours, 
" W. CUTHBERTSON." 
On March 19, 1917, I wrote to each : 
" Dear Sir, — I have sent you per passenger train, carriage paid, 
35 lb. artificial manure, prepared on the basis of a 6 cwt. dressing per 
acre (1 cwt. sulphate of ammonia, 1 cwt. sulphate of potash, 4 cwt. 
26 per cent, superphosphate). It is hoped all the potatos will be 
planted between now and Easter, and, as suggested, in lines 3 feet 
apart and 18 inches between the sets. The precaution of planting 
one or two rows at each end of the trial plot with a variety which is 
not in the trial will be evident, and will, no doubt, be done in every 
case. 
" Yours, 
"W. CUTHBERTSON." 
The tables on pages 132-4 give the returns. 
Nature of Soils etc. 
The following particulars furnished by the growers will indicate the 
nature of the soils on which the potatos were grown. The localities 
are given in the same order as in the table : 
1. Guernsey. The soil is of a very sandy nature and has carried 
bulbs for many years. It was reclaimed from the sea in 181 2, and up to 
twenty-five years ago produced little. When it came into our possession 
it was drained and many thousands of loads of sandy road sweepings 
were added. It lies eight feet above sea-level. 
