122 Report on the Field and Feeding Experiments at Wohirn. 
the smaller quantity of nitrate of soda or salts of ammonia were 
applied, together with minerals. An excessive dose of nitrate 
ol soda or ammonia-salts in a badly ripening season like that 
of 1880 appears to expend itself in the production of much 
straw. 
The Expeeiments in Rotation. 
Rotation No. 1.— 1877, seeds ; 1878, wheat; 1879, mangolds ; 
1880, barley. 
Barley, 1880. — The mangolds grown in 1879 were fed off in 
the field by sheep on the 13th of February, 1880 ; the land was 
ploughed on the 1st of April, and the barley drilled in at 
the rate of 9 pecks per acre on the 8th of April, 1880. Dutch 
clover was sown between the barley on the 10th of May. 
The mangolds in 1879 were grown on— 
Plot 1. With dung, made from 1728 lbs. of straw as litter, 
5000 lbs. of mangolds, 1250 lbs. of wheat-straw chaff, and 
1000 lbs. of decorticated cotton-cake. 
Plot 2. With dung, made from 1728 lbs. of straw as litter, 
5000 lbs. of mangolds, 1250 lbs. of wheat-straw chaff, and 
1000 lbs. of maize-meal. 
Plot 3. With dung, made from 1728 lbs. of straw as litter, 
5000 lbs. of mangolds, 1250 lbs. of wheat-straw chaff, and arti- 
ficial manure, containing two-thirds as much nitrogen and other 
constituents of the manure from 1000 lbs. of decorticated cotton- 
cake, namely, 248 lbs. of nitrate of soda, 100 lbs. of bone-ash 
(made into superphosphate), 62J lbs. of sulphate of potash, and 
65 lbs. of sulphate of magnesia. 
Plot 4. With dung, made from 1728 lbs. of straw as litter, 
5000 lbs. of mangolds, 1250 lbs. of wheat-straw chaff, and artificial 
manure containing as much nitrogen and other constituents as 
the manure from 1000 lbs. of maize-meal, namely, 80 lbs. of 
nitrate of soda, 16|^ lbs. of bone-ash (made into superphosphate), 
7 lbs. of sulphate of potash, and 11 lbs. of sulphate of magnesia. 
The succeeding barley on plots 1, 2, and 4 was grown without 
artificial manure ; on plot 3 with artificial manure containing 
one-third as much nitrogen as the manure from 1000 lbs. of 
decorticated cotton-cake, namely, 124 lbs. of nitrate of soda, 
applied as a top-dressing on the 3rd of June, 1880. 
The crop was cut on the 8th of September, carted and stacked 
on the 23rd and 24th of September, and threshed on the 5th 
and 6th of November, when the straw and chaff were weighed 
at once in the field, and the corn was placed in carefully labelled 
bags in the granary. The corn was weighed and measured on 
the 20th of November, 1880, and the results embodied in the 
following Table were obtained : — 
