352 



CASSELL'S POPULAR GARDENING. 



Growth of Mangel Wunel Tear after Tear upon the 

 same Land. Four Tears, 1881-84. Average Pro- 

 duce per Acre per Anmmi. 



In reference to the foregoing results upon two 

 members of the so-called root-crop family, we otserve 

 a remarkable difEerence in the effect produced upon 

 their development, by one and the same manure, 

 when applied year after year to the same land. 



Also, that the same quantity of manure yields a 



much larger return of Mangel "Wurzel, a plant 

 which belongs to the botanical order Chenopoaiovaai, 

 than of Swedish Turnips, which belong to the order 

 Crucifera. Further, the unmanured plot, even 

 after exhaustion by the previous growth of fifteen 

 crops of Swedes and five crops of Sugar Beet (the 

 results of the latter are not given here), produces a 

 weight of Mangel bulbs eight times as large as of 

 Swedish Turnips. 



Purely nitrogenous manures, while they are seen 

 to have but little influence upon the grovrth of 

 Swedes, show a very marked effect upon Mangel 

 "Wurzel, which is particularly observable when 

 nitrate of sodium is used. These salts when applied 

 in combination with mixed minerals — viz., sulphates 

 of potash, soda, and magnesia, and superphosphate 

 of lime, which do not supply an atom of organic 

 matter to the soil — ^yield of Swedes about a ton per 

 acre per annum less than the annual dressing of 14 

 tons of farmyard dung. "While the yield of Mangel 

 "Wurzel, under precisely the same conditions, exceeds 

 that of the dunged plot by one ton of bulbs in the 

 case of minerals and ammonium salts, and 4f tons 

 by mixed minerals and nitrate of sodium. 



Effect of Manures on Potatoes. 



Growth of Potatoes Tear after Tear on the same Zand at Sothamsted. Four Seasons, 1876-1879. 

 Variety — " I'he FiocTc." Average Produce per Acre per Annum. 



Description of Manure. 



Without Manure 



Ammonium Salts, aloue . 



Nitrate of Sodium, alone . 



Superphosphate of Lime, aloue 



Mixed Mineral Manure 



Farmyard Manure 



Farmyard Manure and Superphosphate 



Farmyard Manure, Superphosphate, and> 



Nitrate "of Sodium i 



Mixed Mineral Manure aud Ammonium Salts 

 Mixecb Mineral Manure and Nitrate of Sodium 



Tons. Cwts. 



2 4 



2 7i 



Tubers. 



Good. 



181 

 3f 



16 

 5J 

 9 



14 

 19 



Small. 



Cwts. 

 6i 



f 



8i 



%i 



7* 

 8f 



Diseased. Total, 



Cwts. 



2i 



4i 



64 



5 



Si 



7 



8J 

 19 

 ISi 



i8i 



Tons. Cwts. 

 2 13 



2 181 



3 14} 

 3 12 

 3 154 



11 



5 2} 



6 15i 



6 18 



7 5} 



Increase over the 

 XJnmanured. 



Total. 



Tons. Cwts. 



Si 



19 



2i 

 18 



9i 



2* 



S 

 12f 



Average Produce per Acre per Annum. (Second Series.) Three Seasons, 1880-1SS2. Variety — " Scotch Champion." 



Description of Manure. 



Without Manure 



Ammonium Salts, alone 



Nitrate of Sodium, aloue . 



Superphosphate of Lime, alone 



Mixed Mineral Manure 



Farmyard Manure .... 



Farmyard Manure and Superphosphate . 



Farmyard Manure, Superphosphate, andl 



Nitrate of Sodium f 



Mixed Mineral Manure and Ammonium Salts 

 Mixed Mineral Manure and Nitrate of Sodium 



Tubers. 



Small. Diseased. 



Tons. Cwts 



Total. 



W4 

 17 



2i 

 15i 

 IS 

 14i 



6 



14| 

 131 

 *4 



Increase over the 

 XJnmanured. 



Good. 



Total. 



Tons. Cwts. Tons. Cvrts. 



2 

 % 



i8i 



7i 

 4 lOi 

 6 11} 

 6 1} 



8i 

 1} 

 1* 



12} 

 li 



Oi 

 11 



