agridat (version 1.23)

sayer.sugarcane.uniformity: Uniformity trial of sugarcane in India, 1932, 1933 & 1934.

Description

Uniformity trial of sugarcane in India, 1932, 1933 & 1934.

Usage

data("sayer.sugarcane.uniformity")

Format

A data frame with the following 4 variables.

row

row

col

column

yield

yield, pounds/plot

year

year

Details

1932 Experiment, 20 col x 48 row = 960 plots

Sayer (1936a, page 685): A tonnage Experiment on sugarcane, Co. 205, un-irrigated, was conducted in Harpur Jhilli in 1932; 42 rows of cane with a space of 3 ft between rows were selected and cut by sections, each section being 30 feet 3 inches long. Thus the yield figures of plot sizes 30 feet 3 inches by 3 feet (i.e. 1/480 acre each), numbering 840 such plots in all, were available for statistical analysis ; For convenience the data of yields of the first forty rows were also considered separately.

Field width: 20 sections x 30 ft 3 in = 605 feet

Field length: 48 rows x 3 feet = 144 feet

Note that the data from Rothamsted library contains 48 rows, but there are some missing values in rows 43-48. This may be why Sayer (1963b) used only 42 rows.

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1933 Experiment, 8 col x 136 row = 1088 plots

Sayer (1936a, page 688). The experiment was conducted in 1933 at Meghaul (Monghyr). A road was cut through the field, creating blocks 480 ft x 315 ft and 480 ft x 93 ft. (See Plate XLI). There were 136 rows, 3 feet apart, 480 feet long each. It required 16 days to harvest the 1088 plots. Each plot was 1/242 acre. The authors conclude that long narrow plots of 12/242 to 16/242 acre would be best.

Field width: 8 plots * 60 feet = 480 feet

Field length: 136 rows * 3 feet = 408 feet

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1934 Experiment, 8 col x 121 row = 968 plots

This experiment was conducted at the New Area, Pusa. The experiment was laid out in 6 blocks, each separated by a 3-foot bund. The cutting of the canes began in Jan 1934, taking 24 days. (An earthquake 15 January delayed harvesting). Conclusion: Variation is reduced by increasing the plot size up to 9/242 acre.

Field width: 8 plots * 60 feet = 480 feet

Field length: 121 rows * 3 feet = 363 feet

The 1932 data was made available with special help from the staff at Rothamsted Research Library.

References

None

Examples

if (FALSE) {

library(agridat)
  
  data(sayer.sugarcane.uniformity)
  dat32 <- subset(sayer.sugarcane.uniformity, year==1932)
  dat33 <- subset(sayer.sugarcane.uniformity, year==1933)
  dat34 <- subset(sayer.sugarcane.uniformity, year==1934)

  # The 1933 data have a 15-foot road between row 105 & row 106.
  # Add 5 to row number of row 106 and above.
  dat33$row <- ifelse(dat33$row >= 106, dat33$row + 5, dat33$row)
  
  b1 <- subset(dat33, row<31)
  b2 <- subset(dat33, row > 30 & row < 61)
  b3 <- subset(dat33, row > 60 & row < 91)
  b4 <- subset(dat33, row > 105 & row < 136)
  mean(b1$yield) # 340.7 vs Sayer 340.8
  mean(b2$yield) # 338.2 vs Sayer 338.6
  mean(b3$yield) # 331.3 vs Sayer 330.2
  mean(b4$yield) # 295.4 vs Sayer 295.0

  mean(dat34$yield) # 270.83 vs Sayer 270.83
  
  libs(desplot)
  
  desplot(dat33, yield ~ col*row,
          flip=TRUE, aspect=408/480, # true aspect
          main="sayer.sugarcane.uniformity 1933")

  desplot(dat34, yield ~ col*row,
          flip=TRUE, aspect=363/480, # true aspect
          main="sayer.sugarcane.uniformity 1934")
  
}