Affect of Fertilization and Irrigation on Tobacco


the one-half inch rate of irrigation. On the other hand, the
high rate of fertilizer application, on the average, did not ap-
preciably increase yield of quality tobacco. However, the inter-
action of rates of fertilizer application with irrigation, with
"variety" and with "cultivation", all were highly significant.
Table 13 shows that best response to high rates of fertilizer is
manifested with one-half inch irrigation.

TABLE 14.-BREAKDOWN OF THE ANALYSIS FOR FERTILIZERS, INTERACTIONS
 OF FERTILIZER AND IRRIGATION, FERTILIZER AND "VARIETY", AND
 FERTILIZER AND "CULTIVATION" IN 1950.
 Degrees
 Source of Variation of Mean Square
 Freedom I Yield I Quality
 I Fertilizers ........-. ...... .... ... ..-..... 3 8.58 3.83
 Time of application ..--......-..-- .. ----1 .02 1.09*
 Rate of application .-...----..--..-.--- 1 6.33** .42
 Rate x time of application ........ 1 2.23* 2.32**
 II Fertilizer x irrigation ................... 6 8.44
 Time x irrigation ..---.....--...........- 2 1.23**'
 Rate x irrigation ............................ 2 2.95**
 Tinie x rate x irrigation ................ 2
III Fertilizer x "variety" ................ 3 1.85
 Rate x "variety" .......................... 1 1.82"*
 Time x "variety" -.----....---..-------. 1 .00
 Rate x time x "variety" ............... 1 .03
IV Fertilizer x "cultivation" ......... 3 3.67
 Time x "cultivation" ................... 1
 Rate x "cultivation" ................... 1 2.31**
 Rate x time x "cultivation" ...... 1 1.31*
 Error (e) ..--......----.....--.......... ........ 72 .34 .22

 Significant at .05 Level.
 ** Significant at .01 Level.

 The better responses to high rates of fertilizer as measured
by quality were obtained when tobacco followed lupine and corn
in cropping practices. The differential responses of effects of
rate of fertilizer applications under the different levels of irri-
gation and cropping practices account for the significant inter-
actions.
 1951 RESULTS
 Total yield and high quality yield of tobacco in 1951 were de-
termined in the same manner as in 1949-1950. Yield and quality
data are shown in Tables 1 and 2.
 The analysis of variance for yield and quality are presented
in Table 15. Irrigation affected both yield and quality signi-
ficantly in 1951.