Case Study #1


An example site was setup at Scarborough. An example map of the site is shown in figure 1.

Figure 1

From this screenshot, we can see that the site in the centre has houses to the north. A grower at this site should avoid spray drift into that area. By clicking on the field, a weather forecast similar to figure 2 should appear. This output contains masses of valuable information that a grower can use. Starting with the bottom graph, a summary of spray drift conditions is shown. The green squares show the best conditions for applying agrochemicals, while the red squares show when spraying is not recommended.

The second graph shows forecast wind speed and direction. Direction is shown at the very top. Whenever the wind is headed toward a sensitive area that you nominate, a red square will show at the top. In this example, a red square can be seen directly above February 25th at 06:00. Whenever the wind is headed 45 degrees or 1 compass direction towards the sensitive area a pink square will show. In the example shown in figure 2 pink squares can be seen starting February 25th at 03:00.

The next graph up shows forecast temperature, rainfall and rainfall probability. In this example, rain is forecast on February 23rd at 13:00 with a low probability. The rain forecast for the next period has a much higher probability. The temperature forecast during this time is just about 12° Celsius. Using this information; some warning of a wet weather disease infection period is shown.

The very top graph shows a humidity and leaf wetness forecast. If this information is added to the information shown in the previous graph, and if you know the time and temperature required for an infection period to occur; a spraying decision can be made. Apple scab for example, requires 11 hours of wetness at 12.7° Celcius to produce a light infection period.

Figure 2

When one puts all this information together; it can be seen that an infection event may be due soon. Applying a spray on February 25th at 00:00 should be the best conditions to minimize drift away from the sensitive area to the north. The next ideal spraying window is on February 26th at 06:00.

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