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Bulletin #2439, Irrigating Potatoes in Maine - long-descriptions

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Figure 1

This line graph shows the relative rate of photosynthesis to be 100 percent when available soil water is at 100 percent. The line for photosynthesis rate remains at 100 percent while the available soil water drops down to 60 percent. Below 60 percent available soil water, the line shows the photosynthesis rate dropping roughly to 85 percent at 50 percent soil water, 65 percent at 40 percent soil water, and 45 percent at 30 percent soil water. The line stops at 30 percent available soil water.

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Figure 2. A&B

These two stacked bar charts show average yield response to irrigation (as percent of dryland yield) in chart A, over average seasonal (June 1 through August 31) rainfall in chart B. The following figures are rough, from a visual reading of the chart. In 1992, the seasonal rainfall in inches was 13, and average yield response to irrigation was 4 percent. In 1993, the seasonal rainfall in inches was 10.5, and average yield response to irrigation was 8 percent. In 1994, the seasonal rainfall in inches was 9, and average yield response to irrigation was 26 percent. In 1995, the seasonal rainfall in inches was 6.5, and average yield response to irrigation was 37 percent. In 1996, the seasonal rainfall in inches was 11.5, and average yield response to irrigation was 16 percent. In 1997, the seasonal rainfall in inches was 10, and average yield response to irrigation was 23 percent. In 1998, the seasonal rainfall in inches was 11.2, and average yield response to irrigation was 23 percent. In 1999, the seasonal rainfall in inches was 11, and average yield response to irrigation was 7 percent. In 2000, the seasonal rainfall in inches was 8, and average yield response to irrigation was 19 percent. There is no data for 2001. In 2002, the seasonal rainfall in inches was 10, and average yield response to irrigation was 16 percent. In 2003, the seasonal rainfall in inches was 11.8, and average yield response to irrigation was 6 percent.

Figure 3

This is a scatter chart. The x (horizontal) axis shows inches of rainfall from July 15 to August 31 on a scale of 0 to 7. The y (vertical) axis shows yield response to irrigation in cwt/acre on a scale from 0 to 120. Black circles appear at the following x,y coordinates, approximated from a visual reading:

3.1,50

3.4,72

4.0,70

4.2,52

4.3,24

4.5,47

5.4,15

5.5,20

6.2,16

Open circles appear at the following x,y coordinates, approximated from a visual reading:

4.3,100

5.2,80

The following equations appear in the blank area of the chart:

Y = 122.8 – 18.2X

r2 = 0.64**


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