Florida Agricultural Experiment Stations


confined nature of any inference that could be based on this
analysis.
 The analysis based on years random shows that both the one-
half inch and the three-fourths inch irrigation applications gave
significant increases in yield and quality over non-irrigated to-
bacco.
 Sixteen hundred pounds of fertilizer per acre produced more
tobacco than 800 pounds, with both the high rate of fertilizer
and the split fertilizer application contributing to a significant
increase in quality. The highly significant fertilizer level and
irrigation interaction furnish evidence that without irrigation a
higher quality tobacco is produced with 800 pounds of fertilizer
per acre than with 1,600 pounds, while with either the one-half
inch or three-fourths inch rate of irrigation, 1,600 pounds of
fertilizer per acre produced better quality tobacco than 800
pounds per acre.
 Differences between years are highly significant for both yield
and quality.
 Table 21 shows that irrigation, amount of fertilizer, and split
 application of fertilizer treatments did not perform alike during
 the three years, as indicated by both yield and quality of pro-
 duction.

 SUMMARY AND GENERAL CONCLUSIONS
 Total yield and high quality yield of tobacco were increased
 by the use of irrigation during each of three years, but in 1950
 the effect of irrigation treatments on total yield was not sig-
 nificant.
 One-half inch of irrigation water per application gave better re-
 sults than three-fourths inch when the net economic benefits are
 considered.
 The number and distribution of irrigation applications was
 dependent upon rainfall and its distribution. Seven to 12 appli-
 cations were required to maintain a suitable soil moisture level
 during the three years. It also appeared that 13 to 15 inches
 of water (rainfall and irrigation) were necessary to produce a
 satisfactory crop of high quality tobacco.
 Both yield and quality of tobacco were influenced by fertili-
 zation. Sixteen hundred pounds per acre of fertilizer, in two
 applications, increased yield and improved quality more than
 any other fertilizer variable tested. Amount and quality of
 tobacco produced is favorably influenced more by the split ap-
 plication of fertilizer than by the rate of application.