944 
Journal of Agricultural Research 
Vol. XXIV. No. II 
There are some abnormal results which undoubtedly are due to the 
washing of the plant food from some of the plants toward others, because 
the lowest results for nitrogen were obtained where the irrigation water 
entered the plots while the highest results were found in the adjacent 
rows. 
In general, the composition of the wheat grown on plots receiving 20 
inches of total water shows approximately as high nitrogen content as 
was found on any of the other plots. The spreading of the rows 18 inches 
apart appears to have influenced the nitrogen content of the wheat. 
The following year the experiment was repeated with the exception 
of distributing the irrigation water, especially for the 16 and 20 inch 
irrigated plots, over a longer period. The purpose of this change was to 
prevent an excessive dilution and washing of the plant food. The re¬ 
sults for nitrogen are recorded in Table III. 
Table III. —Average percentage of nitrogen in wheat grown on cultivated plots receiving 
varying amounts of water 
Plot I, 
Plot ir, 12 
Plot III, 16 
inches of 
Plot IV, 20 
inches of 
Variety. 
Distance. 
rainfall 
inches of 
only.<* 
water. 
water. 
i 
water. 
Inches. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
6 
I. 96 
2. 29 
2. 41 
2. 22 
9 
I. 91 
2.05 
2. 17 
2. 10 
Sonora. 
< 12 
1. 97 
2. 08 
2. 12 
2. 08 
2. 20 
15 
2. 10 
2. 15 
2. 17 
18 
2.44 
2. 21 
2. 21 
2. 29 
Average. 
2. 07 
2- 15 
2. 20 
2. 20 
1 ^ 
1.83 
2 . 16 
2.30 
2. 21 
9 
I. 81 
I.81 
1-93 
2. 10 
Hybrid 14^. 
1 12 
I. 81 
I. 97 
2. 00 
2. 08 
! 
1 
2. 01 
2 . 20 
I. 98 
2. 06 
2. 21 
2. 44 
2. 14 
2. 24 
Average. 
1-93 
2 . 12 
2. 08 
2. 14 
O' Total precipitation at Grandview in 1914 was 8.78 inches. 
The wheat sown in rows i8 inches apart has evidently been benefited, 
since it contains more nitrogen than was found in wheat sown in rows 
6 and 12 inches apart. 
II. CHANGES THAT OCCUR DURING THE DEVELOPMENT OE WHEAT 
distribution of nitrogen in kernel and plant 
In order to know more definitely what conditions are beneficial to the 
production of high percentages of nitrogen in the grain it is of consider¬ 
able importance to know something with regard to the amount of nitrogen 
in the whole plant as well as different parts of the plant, especially after 
the development of the kernel has commenced. For this study, plants 
of nearly equal lengths and weights were selected at 7-day intervals. 
Nitrogen determinations were made on the stems and leaves between 
the joints or nodes, above the top node, and on kernel and chaff. The 
data in Table IV show the percentages of nitrogen in the plant exclusive 
