Affect of Fertilization and Irrigation on Tobacco


 1950 RESULTS
 The analysis of variance for total yield and quality for 1950
 are presented in Table 9. Irrigation did not significantly affect
 total yield or quality in 1950.
 Yield and quality of tobacco were higher, on the average, on
 the corn plots than on the peanut plots. The highly signi-
 ficant interaction of "variety" and irrigation may be explained
 by the fact that more high quality tobacco was obtained on the
 corn plots than on the peanut plots with irrigation. Without
 irrigation there was no difference in the amount of high quality
 tobacco produced.
 Yield and quality data, based on irrigation, and rate and time
of fertilizer application are shown in Tables 10 and 11. Each
entry is based on a total of 12 plots.
 The 1,600-pound rate of fertilizer was superior to the 800-
pound rate. There was no significant difference in quality im-
provement between 1,600 pounds of fertilizer applied at one time
and the split applications of 400 + 400 and 800 + 800 pounds.
Eight hundred pounds applied at one time resulted in the lowest
yield and quality of all fertilizer treatments.
 A reorganization of the data based on time and rate of fer-
tilizer application, for yield and quality, is shown in Tables 12
and 13, with each entry based on a total of 24 plots.
 An analysis for the effects of time and rate of fertilizer ap-
plications and interactions of fertilizer and irrigation, fertilizer
and "variety" and fertilizer and "cultivation" for both yield and
quality is presented in Table 14.
 Fertilizer treatments influenced total yield of tobacco inde-
pendently of "cultivation" practice and irrigation rates. Signi-
ficant response to fertilizers appears to be associated primarily
with rate of application. Fertilizer applications of 800 and
1,600 pounds, all applied before transplanting, gave best response
with one-half inch irrigation, while the split application rates
of 400 + 400 and 800 + 800 pounds gave best response with
three-fourths inch irrigation. The split applications of fertilizer
appeared to give the best average response, but differences were
non-significant.
 The response to fertilizer as measured by yield and quality may
be interpreted in terms of effect of rate and of time of appli-
cation. Split applications significantly increased production of
high quality tobacco. However, the interaction of time and
irrigation was highly significant. It is evident from Table
12 that best response to the split application is obtained from