agridat (version 1.23)

batchelor.uniformity: Uniformity trials of apples, lemons, oranges, and walnuts

Description

Uniformity trials of apples, lemons, oranges, and walnuts, in California & Utah, 1915-1918.

Format

Each dataset has the following format

row

row

col

column

yield

yield per tree (pounds)

Details

A few of the trees affected by disease were eliminated and the yield was replaced by the average of the eight surrounding trees.

The following details are from Batchelor (1918).

Jonathan Apples

"The apple records were obtained from a 10-year old Jonathan apple orchard located at Providence, Utah. The surface soil of this orchard is very uniform to all appearances except on the extreme eastern edge, where the percentage of gravel increases slightly. The trees are planted 16 feet apart, east and west, and 30 feet apart north and south."

Note: The orientation of the field is not given in the paper, but all other fields in the paper have north at the top, so that is assumed to be true for this field as well. Yields may be from 1916.

Field width: 8 trees * 16 feet = 128 feet

Field length: 28 rows * 30 feet = 840 feet

Eureka Lemon

The lemon (Citrus limonia) tree yields were obtained from a grove of 364 23-year-old trees, located at Upland, California. The records extend from October 1, 1915, to October 1, 1916. The grove consists of 14 rows of 23-year-old trees, extending north and south, with 26 trees in a row, planted 24 by 24 feet apart. This grove presents the most uniform appearance of any under consideration [in this paper]. The land is practically level, and the soil is apparently uniform in texture. The records show a grouping of several low-yielding trees; yet a field observation gives one the impression that the grove as a whole is remarkably uniform.

Field width: 14 trees * 24 feet = 336 feet

Field length: 26 trees * 24 feet = 624 feet

Navel 1 at Arlington

These records were of the 1915-16 yields of one thousand 24-year-old navel-orange trees near Arlington station, Riverside, California. The grove consists of 20 rows of trees from north to south, with 50 trees in a row, planted 22 by 22 feet. A study of the records shows certain distinct high- and low-yielding areas. The northeast corner and the south end contain notably high-yielding trees. The north two-thirds of the west side contains a large number of low-yielding trees. These areas are apparently correlated with soil variation. Variations from tree to tree also occur, the cause of which is not evident. These variations, which are present in every orchard, bring uncertainty into the results offield experiments.

Field width: 20 trees * 22 feet = 440 feet

Field length: 50 trees * 22 feet = 1100 feet

Navel 2 at Antelope

The navel-orange grove later referred to as the Antelope Heights navels is a plantation of 480 ten-yearold trees planted 22 by 22 feet, located at Naranjo, California. The yields are from 1916. The general appearance of the trees gives a visual impression of uniformity greater than a comparison of the individual tree production substantiates.

Field width: 15 trees * 22 feet = 330 feet

Field length: 33 trees * 22 feet = 726 feet

Valencia Orange

The Valencia orange grove is composed of 240 15-year-old trees, planted 21 feet 6 inches by 22 feet 6 inches, located at Villa Park, California. The yields were obtained in 1916.

Field width: 12 rows * 22 feet = 264 feet

Field length: 20 rows * 22 feet = 440 feet

Walnut

The walnut (Juglans regia) yields were obtained during the seasons of 1915 and 1916 from a 24-year-old Santa Barbara softshell seedling grove, located at Whittier, California. [Note, The yields here appear to be the 1915 yields.] The planting is laid out 10 trees wide and 32 trees long, entirely surrounded by additional walnut plantings, except on a part of one side which is adjacent to an orange grove. The trees are planted on the square system, 50 feet apart.

Field width: 10 trees * 50 feet = 500 feet

Field length: 32 trees * 50 feet = 1600 feet

References

McCullagh, P. and Clifford, D., (2006). Evidence for conformal invariance of crop yields, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, 462, 2119--2143. https://doi.org/10.1098/rspa.2006.1667

Examples

if (FALSE) {

library(agridat)
libs(desplot)

  # Apple
  data(batchelor.apple.uniformity)
  desplot(batchelor.apple.uniformity, yield~col*row,
          aspect=840/128, tick=TRUE, # true aspect
          main="batchelor.apple.uniformity")

  # Lemon
  data(batchelor.lemon.uniformity)
  desplot(batchelor.lemon.uniformity, yield~col*row,
          aspect=624/336, # true aspect
          main="batchelor.lemon.uniformity")

  # Navel1 (Arlington)
  data(batchelor.navel1.uniformity)
  desplot(batchelor.navel1.uniformity, yield~col*row,
          aspect=1100/440, # true aspect
          main="batchelor.navel1.uniformity - Arlington")

  # Navel2 (Antelope)
  data(batchelor.navel2.uniformity)
  desplot(batchelor.navel2.uniformity, yield~col*row,
          aspect=726/330, # true aspect
          main="batchelor.navel2.uniformity - Antelope")

  # Valencia
  data(batchelor.valencia.uniformity)
  desplot(batchelor.valencia.uniformity, yield~col*row,
          aspect=440/264, # true aspect
          main="batchelor.valencia.uniformity")

  # Walnut
  data(batchelor.walnut.uniformity)
  desplot(batchelor.walnut.uniformity, yield~col*row,
          aspect=1600/500, # true aspect
          main="batchelor.walnut.uniformity")

}