245 



E. PORTER and R. C. GAUT. Summary of experiments on the 

 manuring of potatoes in Lancashire. (County Council 

 Lancaster, Ed. Com., Agr. Dept., Farmer's BuL, 13, 25, pi. i). 

 E. S. R., XXI, August 1909, Washington. 



Basing their recommendations on the results of the experiments 

 here described, the authors advise the use of 20 tons of farm-yard 

 manure per acre for potatoes on land in moderately good condition. 

 Where commercial fertilisers are to be used alone, 2.5 cwt. of sul- 

 phate of ammonia, 6 cwt. of superphosphate, and 2 cwt. of muriate 

 of potash is recommended. Satisfactory crops of potatoes were 

 grown with the use of commercial fertilisers alone, but the practice 

 is not considered generally good. For the production of the lar- 

 gest and most profitable crops it is advised that 10 tons of farm-yard 

 manure, i cwt. of sulphate of ammonia, 4 cwt. of superphosphate, 

 and i cwt. of chloride of potash per acre be given. 



R. B. GREIG. Effects of the new Nitrogenous manures on po- 

 tatoes and hay. Aberdeen and North of Scotland College of 

 Agriculture Experiments, Leaflet, No. 9, 1909. 



This is a brief report on the effects of Cyanamide of calcium 

 and Nitrate of lime on potatoes and hay as compared with those 

 obtained by the use of Sulphate of ammonia and Nitrate of soda. 

 The experiments on potatoes were carried on from 1907 to 1909 

 those on grass lands were only made in 1909. 



The results show that Cyanamide of calcium and Nitrate of lime 

 may be used with advantage in the case of potatoes. They can 

 be used when the potatoes are planted, as they do not seem to 

 favour the development of potato-rot (gale) nor to deteriorate the 

 quality or size of the tubercles. Nitrate of lime should be prefer- 

 red to Cyanamide. 



The different nitrogenous manures used for spreading on the 

 field in April 1909 may be classed as follows in order of merit: 



Manure Production in hay 



Cwts. per acre kgs. per ha. 



Nitrate of soda ...... 49-35 



Sulphate of ammonia .... 48.33 6070 



Nitrate of lime ...... 47-35 5947 



Cyanamide of calcium .... 43.48 5461 



Without nitrogenous manure (av.) 39.08 4908 



Without any manure (average) . 34.81 43 7 2 



