Journal of A.griculture. 



[lo Xov.. 19 lo. 



As far as the manures are concerned on this plot it is apparent tliat the 

 minimum dressing of phosphoric acid was ample. It resulted in an 

 increase of i ton of marketable tubers per acre for a cost of 8s. pd., whilst 

 the maximum quantity, 4 cwt., costing 17s. 6d. pei acre, did not increase 

 the yield at all. The tubers on section A were a more even run with 

 very little .second growth , those on B were prongy, showing that the 

 heavier dressing forced the growth of the crop in the early stages of the 

 plants and cau.sed second growth when the rain came in March. 



The heaviest yield is on .section D. showing the effect of a dressing 

 of I cwt. sulphate of ammonia, 6 tons 1 cwt., being an increase of 14 

 cwt. per acre. There is no doubt that the action of sulphate of ammonia 

 is due in a measure to the pre.sence of a large amount of organic matter 

 in the soil, ^^'ith reference to section E the action of sulphate of potash 

 was not so satisfactory, the increase over the unmanured section only 

 amounting to 6 cwt.. being 14 cwt. less than section A dressed with phos- 

 phoric acid. 



New Zealand Pinkeye No. 2 in this plot was a continuation of the 

 experiment for the improvement of the type of that variety. 

 Table M. — Impeovement of Type of Xew Zealand Pinkeye. 



Type Planted. 



Full Crown 

 Deep Crown 



Full Crowns. 



80 per cent. 

 60 per cent. 



Deep Crowns. 



20 per cent. 

 40 per cent. 



The above results show that all that can be claimed for .selection is that 

 the percentage of objectionable tubers can be kept down, but not eliminated 

 altogether. 



CoLAc Plot (Mes-srs. K.ankix Bros.). 



This ])lot was simply a variety test. The soil was rich vi>rgin volcanic 

 land. No manures were u.sed. The following varieties were planted on 

 3rd and 4th November: — Black Prince, Brown's River. New Zealand 

 Pinkeve. Scotch Grev. Sutton's Abundance, and Up-to-Date. The season 

 proved unfavourable for crops planted at that period. The most satisfac- 



tory yield was obtained from New Zealand Pinkeye — -, 

 per acre. 



tons. 



cwt. 



qr. 



Table X.— Returns of Colac Plot. 



Name of Variety. 



Black Prince 

 Brown's Ri%er 

 Xew Zealand Pinkeye 

 Scotch Grey 

 Sutton's Abundance 

 Up-to-Date 



Included in the above plot were six new varieties rai.sed by Mr. P. J. 

 Ryan, of Millbrook, whose efforts in the matter of raising new varieties 

 have been in the direction of producing an export ^•ariety of heavy crop- 

 ping capacity combined with quality. In this he has met with an 

 encouraging measure of success with two of the.se varieties, viz., Norfolk 

 and Wellington, produced by crossing New Zealand Pinkeye and Brown's 

 River varieties. 



Norfolk is practically a coloured New Zealand Pinkeve in type of 

 ^uber. colour, and texture of Hesh. St. Albans pro\ed a decidedlv earlv 



