Affect of Fertilization and Irrigation on Tobacco


three-fourths inch rate was required to return the top 18 inches
of soil to field capacity after 70 percent of the available moisture
in this zone had been depleted. Rainfall and irrigation data for
1949, 1950 and 1951 were recorded and the data are shown in
Figures 5, 6 and 7.


 4/2 4/6 4/14 4/194//23 25/2 5 5/5 / 5/1 /21 526 M /2 6/9 6/16 6/ 6G/2
Fig. 6.-Cumulative chart showing distribution of rainfall and irrigation
 during 1950 growing season for tobacco.

 The two rates of fertilizer used were 800 and 1,600 pounds per
acre per year with two methods of application. In one method
the total quantity of fertilizer was applied a week before trans-
planting (i.e., 800 and 1600). In the other, a split application
was made in which one-half of the fertilizer was applied a week
before transplanting and the other half was applied approxi-
mately one month after transplanting (i.e., 400 + 400 and
800 + 800).
 The fertilizer was formulated to contain 60 pounds of nitrogen,
160 pounds of phosphoric acid, 160 pounds of potash, 40 pounds