246 - 



Manuring the potato crop. Mark Lane Express, London 103, 

 1910, 4089, p. 137. 



The recommendations of various authorities on this subject are 

 summarized, including those based upon recent experiments in Scot- 

 land with lime-nitrogen. 



. 



R. B. GREIG. Turnip manuring experiments, 1909. Aberdeen 

 and No.rth of Scotland College of Agriculture. Experiments 

 leaflet, n. n. 



The action on turnips of finely ground mineral phosphate, used 

 in large quantities in the North of Scotland, is studied. 



All the patches on which experiments were made were manured 

 alike with sulphate of ammonia and potassic salts. The experi- 

 ments showed the advisability of using ground phosphates along 

 with stable manure. The following is the yield of the turnips: 



Manure With stable-manure Without stable-manure 



tons. cwts. tons. cwts. 



Superphosphate 23 15 17 10 



Ground Algerine phosphate . . 21 8 16 n 



Belgian 21 7 15 4 



,. Florida ,, . . 20 7 13 14 



Without fbanure (average) ... n 13 



R. B. GRIEG. Turnip manuring experiments, 1908. (Aberdeen 

 and North of Scotland Agric. College, Leaflet 7, p. 6). Exp. Stat. 

 Record, May, 1910. Washington. 



A mixture of 6 /7 cwt - sulphate of ammonia, 5 3 / 4 cwt. super- 

 phosphate, and i cwt. sulphate of potash produced an increase of 

 9 tons 15 cwt. of turnips per acre. When the potash was omitted 

 the increase over the check plat was only 5 tons 6 cwt. On 

 omitting the phosphate the increase was 2 tons 4 cwt., and omit- 

 ting the nitrogen resulted in an increase of 7 tons 10 cwt. The 

 use of superphosphate alone showed an increased yield of 5 tons 

 over the check plat, but of only i ton 15 cwt. on plats fertilized 

 with dung. Applications of more than 3 or 4 cwt. of superphos- 

 phate appeared to be unprofitable, except as to their residual value. 

 Phosphoric acid in high grade and in low grade slag appeared 

 equally advantageous, except that the low grade slag had an ap- 

 parent advantage on land deficient in lime. 



