942 
Journal of Agricultural Research voi. xxiv. no. h 
It was found that the percentage of nitrogen in the fall-sown wheats 
was only slightly lower than that in the spring-grown wheat. These 
similarities in nitrogen content have indicated that there are some 
factors, beside the length of the growing season, which have influenced 
the formation of wheat of high nitrogen content. It was further found 
that wheat grown in the nursery plots contained more nitrogen than was 
found in wheat grown in variety-test plots or under practical farming 
conditions. The wheat grown in the nursery contained i8 per cent 
more nitrogen than was found in the wheat grown in the variety-test 
plots, and this nitrogen content was considerably higher than was found 
in the wheat grown under field conditions. These outstanding differences 
in the percentages of nitrogen pointed to the influence of the method of 
preparing the soil on the composition of the wheat. It was observed 
that the wheat grown in the nursery plots was sown in rows i8 inches 
apart, while the wheat grown in the variety-test plots was seeded 6 inches 
apart. Furthermore, the nursery plots received a very thorough culti¬ 
vation, a practice which was not followed in the variety-test plots. These 
differences in soil treatment and seeding undoubtedly played a very 
important part in the development of wheat containing different amounts 
of nitrogen and also indicated the possible reason for the similarity of the 
percentages of nitrogen in the fall-sown and spring-sown wheats. 
The study of the influence of cultivation on wheat sown in rows different 
distances apart was, therefore, undertaken. The wheat was sown in 
rows 6, 9, 12, 15, and 18 inches apart. That sown 6 and 9 inches apart 
could not be properly cultivated but represented farm methods on well- 
prepared soil. A sample of the same wheat grown on another plot was 
also analyzed for the purpose of making a comparison of the nitrogen 
content of the wheat grown in the nursery with that under field con¬ 
ditions. The results are given in Table I. 
Tabi^B I.— Percentage of nitrogen in wheat {hybrid 147) sown in rows various distances 
apart and cultivated 
Treatment. 
Fall wheat. 
Spring wheat. 
Nitrogen. 
Increase 
over field. 
Nitrogen. 
Increase 
over field. • 
Field grown. 
Per cent. 
2 . II 
2. 30 
2.35 
2. 38 
2. 32 
2. 54 
2. 48 
2* 53 
2. 47 
2.66 
2. 66 
Per cent. 
Per cent. 
Per cent. 
Nursety grown: 
6 inches apart, end rows. 
6 inches apart, middle rows. 
9 inches apart, end rows. 
9 inches apart, middle rows. 
12 inches apart, end rows. 
12 inches apart, middle rows. 
15 inches apart, end rows. 
15 inches apart, middle rows. 
18 inches apart, end rows. 
18 inches apart, middle rows. 
9.0 
II. 4 
12.8 
10. 0 
20. 4 
17 ' 5 
19.9 
17.1 
26. I 
26. I 
2. 50 
2. 56 
2.46 
2 - S 3 
2. 58 
2. 68 
2' 55 
2. <;6 
2.56 
2.77 
18. s 
21.3 
16. 6 
19.9 
22. 2 
27. 0 
20. 8 
24. 6 
21.3 
31.2 
* Calculated using (2.11 per cent) field sample of fall wheat as a basis. 
It will be noted that the smallest increase of nursery-grown over 
field-grown wheat is 9 per cent, while the largest increase is 31.2 per cent. 
The fall wheat grown in rows 18 inches apart in the nursery shows 15 
