174 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



the whole, an apphcation of I2|- tons of stable manure an acre has, on 

 the Hadlow soil, fairly well satisfied the requirements of the different 

 vegetables as regards potash. There were, however, slight increases 

 from the addition of potash in almost every instance. 



When, however, crops were grown with artificials alone (and it is 

 interesting to note that, even on such inferior soil, the table shows 

 that it is possible to grow many market-garden crops satisfactorily 

 without dung) the necessity for the inclusion of potash is quite evident, 

 and it is obvious that the different plants have suffered seriously 

 when potash has been withheld. It is particularly marked in the 

 case of Beet, Parsnips, Onions, and Celery. 



The results in the case of bush fruits are not available for so long 

 a period, but so far they are very similar to those obtained in the case 

 of vegetables. The average crop of Gooseberries on the plot receiving 

 no dung has been nearly trebled as a result of the addition of potash. 



The results obtained in these experiments are all the more striking 

 when it is remembered that of all soils clays are, as a rule, least 

 benefited by potash manuring, and that nitrate of soda was the nitro- 

 genous manure employed in every case. The Rothamsted experiments 

 have shown that, as a rule, when nitrate of soda is used, potash manure 

 is less necessary than when the nitrogen is derived from other sources. 



The source of potash in the above experiments was sometimes 

 sulphate of potash and sometimes kainit, the two being alternated ; 

 the quantity used per annum was i cwt. of sulphate of potash or 

 4 cwt. of kainit an acre. — A. S. 



Potato Blight and Burgundy Mixture {Agr. Gaz. N.S.W. 

 vol. XXV. pt. i. pp. 48-50). — Burgundy mixture is superior to Bordeaux 

 because it adheres longer to the foliage and is easier to prepare. 

 Burgundy mixture is prepared by dissolving 2 lb. of copper sulphate 

 and 2 J lb. of washing soda separately in water ; pour the soda solu- 

 tion into the solution of copper sulphate and make up to 10 gallons 

 with water. If the mixture turns blue litmus-paper red, add more 

 washing-soda solution. Use as soon as made. Twenty pounds of 

 copper sulphate and 25 lb. of washing soda are sufficient to spray 

 an acre of Potatos. — 5. E. W. 



Potato, Bud Variation in {Rev. Hort., p. 524, Nov. 16, 1913). — 

 Abstract of report of MM. E. Heckel and C. Verne to the Societe 

 Nationale d' Agriculture and on experiments with tuberiferous 

 Solanums collected in the Cordilleras by the latter. They report 

 that partial or total mutation has taken place with regard to S. 

 Commersonii, Maglia, tuberosum, immite and Jamesii, and that other 

 species show preliminary signs of mutation (for instance S. Bitten). 

 They consider that they are on the track of a strain immune from 

 parasites. — C. T. D. 



Potato, Powdery Dry-rot of the. By W. A. Orton {U.S.A. 

 Dep. Agr., Bur. PL Ind., Circ. 110 ; Jan. 1913). — Describes a new 



