Florida Agricultural Experiment Stations


tion of 400 + 400 pounds. The split application of 800 + 800
pounds of fertilizer produced significantly larger total yields and
more high quality tobacco than any of the other fertilizer
treatments.
 A reorganization of the data based on time and rate of fer-
tilizer application for total yield and high quality is shown in
Tables 18 and 19, with each entry based on a total of 24 plots.

TABLE 19.-YIELD OF HIGH QUALITY TOBACCO IN POUNDS PER 12 PLOTS* AS
 AFFECTED BY TIME OF FERTILIZER APPLICATION AND IRRIGATION,
 AND RATE OF .FERTIILIZER AND IRRIGATION IN 1951.
 r Average
 Irriga- Irriga- Irriga- Total Mean
 Treatment** tion tion tion Yield Yield
 _None /2 Inch % Inchi per Plot
Time of Singlet 38.24 69.03 60.68 167.95 3.50
Application SingleII
Application Split 38.70 105.35 78.22 222.27 4.63
Rate of 800 37.81 75.62 60.30 173.73 3.62
Application
 Ap1,600 39.13 98.76 78.60 216.49 4.51
 To convert to yield per acre multiply each entry by 12.75.
 ** Differences between times and rates of fertilizer application are significant.
 t All fertilizer applied before transplanting.
 t One-half of fertilizer applied before transplanting, one-half one month after trans-
 planting.

 A breakdown of the analysis for effects of time and rate of
fertilizer application for both yield and quality is presented in
Table 20.
 Fertilizer treatments influenced total yield of tobacco inde-
pendently of "cultivation" practice. The highly significant re-
sponse to fertilizer appears to be associated with both time and
rate of application.
 Fertilizer applications of 400 + 400 and 800 + 800 pounds
gave best response with one-half inch irrigation. It is significant
that with one-half inch irrigation the 400 + 400-pound ferti-
lizer application produced a higher yield than 1,600 pounds
applied at one time.
 The response to fertilizer treatments as measured by total
 yield and high quality may be interpreted in terms of effects of
 rate and time of application. Split applications significantly
 increased the quality of tobacco. However, the interaction of
 time and irrigation was highly significant. It is evident from
 Table 18 that the largest response was from one-half inch rate
 of irrigation. Split applications of fertilizers increased both