Case Study #2

Horrellville

An example site was set up in Horrellville. A map of the site is shown in figure 1.

Figure 1


From this screenshot we can see that the site in the centre has a river to the northwest. A grower at this site should avoid spray drift into that area to avoid harming aquatic organisms. 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 towards 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 23rd at 18:00. 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 24th at 12:00 Noon.

The next graph up shows forecast temperature, rainfall and rainfall probability. In this example, rain is forecast on February 23rd at 18:00 with a low probability. The rain will not start again until February 25th at 0:300. The temperature forecast during this time is between 10 and 15° Celcius. 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 when 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 12.77° Celsius to produce a light infection period.


Figure 2


When one puts this information together, it can be seen that an infection event may be due soon. Applying a spray on February 25th at 12:00 Noon will be the worst conditions to minimize drift. Sprays applied on February 25th and 26th will drift directly towards the sensitive area. The first opportunity for a spraying window away from the sensitive area is on February 27th at 09:00. This is an ideal time for a spray window.


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