Affect of Fertilization and Irrigation on Tobacco


the additional fertilizer was less than that obtained from the
one-half inch rate of irrigation. Based on 1949 data, the 800 +
800-pound split application of fertilizer with the one-half inch rate
of irrigation gave best results.

TABLE 7.-YIELD OF HIGH QUALITY TOBACCO IN POUNDS PER 24 PLOTS* AS
 AFFECTED BY TIME OF FERTILIZER APPLICATION AND IRRIGATION AND
 RATE OF FERTILIZER AND IRRIGATION IN 1949.
 I Irriga- Irriga- Irriga-
 Treatments** tion tion tion Total Average
 I None %1 Inch 3% Inch
Time of Singlet 12.37 43.28 39.14 94.79 1.31
Application J I
 Applic Splitt 8.30 74.48 66.91 149.69 2.08

Rate of 800 10.26 46.37 45.16 101.79 1.41
Application 1 1
 S1,600 10.41 71.39 60.89 142.69 1.98
 To convert to yield per acre multiply each entry by 12.75.
 ** Differences between times and between rates of applications are highly significant.
 f All fertilizer applied before transplanting.
 : One-half of fertilizer applied before transplantirg and the other half four weeks later.

 The effect of "variety" (corn or peanuts) on yield was not
significant. However, a higher quality of tobacco was pro-
duced when planted after corn. Highest yield of good quality
tobacco was obtained on the corn plots with the split application
of fertilizer. This differential response accounts for the highly
significant interactions of fertilizer and "variety" and, specifi-
cally, of time of fertilizer application and "variety."

TABLE 8.-BREAKDOWN OF THE ANALYSIS FOR FERTILIZERS AND INTERACTION
 OF FERTILIZERS AND IRRIGATION AND FERTILIZERS AND "VARIETY" ON
 YIELD AND QUALITY OF TOBACCO IN 1949.
 Degrees
 Source of Variation of Mean Square
 SFreedom Yield ( Quality
 I Fertilizers .....-...... ...........- ....... ... 3 5.71** 11.30**
 Time of application ................... 1 4.23** 20.93**
 Rate of application ...................... 1 12.31** 11.62**
 Rate x time of application .....-- 1 .61 1.36
 II Fertilizer x irrigation ....-...... 6 1.69** 4.32**
 Time of application x irrigation... 2 2.68* 7.88**
 Rate of application x irrigation.... 2 1.16 3.26**
 Time x rate x irrigation ............ 2 1.26* 1.82*
III Fertilizer x "variety" ................ 3 6.64
 Time of application x "variety".... 1 2.21**
 Rate of application x "variety"... 1 .30
 Time x rate x "variety" ............... 1 .02
 Error (e) ... -............................ 72 .40 .51
 Significant at .05 percent level.
 ** Significant at .01 percent level.