II Sept., 191 i.] Potato Exferiniciital Fields. 1910-11, 



639 



di.sease. The .same may be .said of Excelsior and Snowflake. An instance 

 may also be mentioned where a crop of Carman planted the third week ' 

 in November returned 75 per cent, of clean tubers; while an adjoining^ 

 field, planted with the same seed three weeks later, was not worth digging. 



Plot .\t Shepparton Agricultural High School. 



The experimental plot at the Sliepparton Agricultural High School was- 

 planted on 4th February. Although this was rather late in the season, 

 the results may be considered satisfactory. The soil was a sandy loam 

 and even throughout. The plot was commanded bv the irrigation channels- 

 and well suited for the application of water ; Init, owing to the abundance 

 of rain and the low evaporation, it was onlv found necessary to irrigate 

 once during the growing period. 



The results from the manurial dressings, which indicate the necessity 

 of phosphoric acid in liberal quantities, will afford a basis for future 

 operations. 



Two \arieties were used in i)lanting the plot, viz., Early Rose and 

 (Jarman. The seed of the latter was of such an unsatisfactory character, 

 and the ])lants so irregular in growth, that in estimating the value of the 

 operations and the influence of the manures on the crop, the results have 

 been disju/nsed with, onlv those from the Ivirly Rose variety being con- 

 sidered. 



Secti<:ii ( ". without any manure, returned 3 tons 6 cwt. i qr., whilst 

 on .section Ai, with a dressing of i cwt. of su{)erpho.sphate, there was a 

 decrea.se of 6 cwt. i qr. indicating that a light dressing is injurious. Sec- 

 tion A2, with the maximum dressing of 2 cwt. superphosphate, gave aa 

 increase of nearly i ton per acre. Section B, with the addition of i cwt. 

 of sulphate of ammonia, shows an increase of only 15 cwt. per acre over 

 the plot with no manure. A remarkable feature of the returns from sec- 

 tion D is that, with the addition of i cwt. of sulphate of potash to the 

 dressing of superphos[)hate. the vield was 6 cwt. i qr. less than the un- 

 manured. 



The most satisfactory nlurn w.is from the complete manure composed 

 of 2 cwt. superphosphate, i cwt. sulphate of potash, and i cwt. sulphate 

 of ammonia. The results of one year must not Vj€ considered conclusive 

 jiroof that these are the most satisfactory f]uantities of manure. Further 

 experiments are necessary to confirm the aboxt- ;iTid also to test a further 

 increase of suner|)hos|)hatr. 



XV. — Shepparton Agkicultukal High School Plot. 



