382  The  Wohurn  Field  Experiments,  1909. 
each  case  the  same  amount  of  nitrogen  should  be  supplied. 
The  calcium  cyanamide  was  given  mixed  with  dry  soil,  the 
other  applications  were  put  on  unmixed. 
(a)  Experiments  with  Wheat  {Lansome  Field),  1909. 
Ten  plots  were  arranged,  so  as  to  give  duplicate  plots  of 
each  of  the  applications,  viz.,  sulphate  of  ammonia,  nitrate 
of  soda,  calcium  nitrate,  calcium  cyanamide,  and  no  top- 
dressing. 
“Street’s  Imperial”  wheat  was  drilled  on  November  19, 
1908,  3 cwt.  per  acre  of  superphosphate  and  1 cwt.  per  acre  of 
sulphate  of  potash  being  given  as  a general  mineral  manuring 
to  all  plots  alike.  This  crop  followed  a previous  wheat  crop, 
so  that  the  land  was  in  by  no  means  “ high  ” condition.  The 
nitrogenous  top-dressings  were  applied  on  May  19,  1909. 
The  first  manure  to  “ show  ” was  nitrate  of  soda,  and  this  was 
closely  followed  by  calcium  nitrate  ; the  influence  of  calcium 
cyanamide  was  next  apparent,  and  that  of  sulphate  of  ammonia 
latest  of  all.  It  was  difficult  to  say,  during  the  growing 
period,  which  wa's  the  best  crop.  The  wheat  was  cut  on 
August  25.  The  results  are  given  in  Table  X. 
Table  X. — Experiments  with  Nitrogenous  Top-dressings 
on  Wheat,  1909. 
Lansome  Field — -Produce  per  acre. 
Plot 
Manures  per  acre 
Head  com 
Tail 
corn 
Straw, 
chaff,  &c. 
Value  of 
corn  per 
quarter 
on  basis 
of  34s.  6d. 
Weight 
Bush. 
W eight 
per 
bushel 
W eight 
Lb. 
Lb. 
Lb. 
C. 
q- 
lb. 
8.  d. 
1 
Sulphate  of  am- 
monia,  1 cwt. 
1,150 
19-5 
59-0 
147 
23 
0 
9 
33  6 
2 
Nitrate  of  soda* 
1,327 
22-7 
58-3 
195 
27 
0 
6 
33  6 
3 
Calcium  nitrate*  . 
1,145 
19-6 
58-5 
170 
22 
3 
13 
33  6 
4 
No  top-dressing 
675 
11-2 
60-0 
100 
15 
0 
12 
34  6 
5 
Calcium  cyana- 
mide*  . 
952 
16-3 
58-2 
135 
18 
2 
9 
33  6 
6 
Sulphate  of  am- 
monia,  1 cwt. 
782 
13-5 
57-7 
157 
19 
1 
16 
32  0 
7 
Nitrate  of  soda*  . 
950 
16-6 
57-2 
200 
19 
2 
9 
32  0 
8 
Calcium  nitrate* 
742 
12-9 
57-5 
177 
20 
1 
8 
32  0 
9 
Calcium  cyana- 
mide*  . 
1,042 
17-9 
68-2 
140 
15 
2 
18 
33  6 
10 
No  top-dressing 
815 
13-6 
60-0 
57 
16 
2 
9 
34  6 
1 In  quantity  to  supply  as  much  nitrogen  as  that  contained  in  1 cwt.  sulphate  of 
ammonia. 
The  conclusions  to  be  drawn  will  be  stated  in  conjunction 
with  the  experiments  on  the  other  crops. 
