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Cotton Planting Forecasts |
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The 5-Day forecast of degree-days (heat units) helps San Joaquin Valley cotton growers determine if suitable weather to plant cotton is likely to occur. Using the weather forecast along with the planting guidelines and taking soil temperatures can aid in making planting decisions to establish a vigorous cotton stand. The 5-day degree-day forecast can be accessed at the UC IPM Online web site. The forecast is updated daily at about 9:00 am. Click here to go to the UC IPM Cotton Forecast Use your browser’s “Back” button to return to the AgQuest web page. Or Click on an item in the far the Left Column. The graphical presentation below shows the actual, forecasted and normal degree-days during the 2005 cotton planting period. This information will be updated weekly through May 1, 2005.
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2005 - Western Fresno County Cotton Planting Forecasts |
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This is the Last Cotton Planting Degree-day Forecast of the 2005 Season |
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| Last Update: July 03, 2008 |
Next Update: 2006 |
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| 5-Day Forecast of Fahrenheit Degree-days | Planting Guidelines Using 5-Day degree-day Forecast | ||||||||||||
| Temperature oF1 | |||||||||||||
| Date | Minimum | Maximum | Degree-Days2 | Forecasted Degree-days | Planting Conditions | ||||||||
| May 1 | 51 | 75 | 4.7 | >20 |
Ideal |
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| May 2 | 49 | 76 | 4.7 | 15-20 |
Adequate |
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| May 3 | 50 | 78 | 5.8 | 10-15 | Marginal | ||||||||
| May 4 | 51 | 79 | 6.4 | <10 | Unfavorable | ||||||||
| May 5 | 52 | 76 | 5.3 | ||||||||||
Total |
27.0 |
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| The 5-Day forecast of degree-days (heat units) is provided to help cotton growers determine suitable weather to plant cotton and avoid chilling injury to emerging cotton seedlings. The forecast, with the planting guidelines, should be used together with soil temperatures (seeding depth at 8:00 am) above58oF for timely, vigorous seedling establishment. The degree-day forecasts are based on the best available weather forecasts from the National Weather Service. However, local conditions may cause some variation. Use your judgment if your local temperatures are different. If your min/max temperatures are above those reported, then your degree-days will be higher; if your min/max temperatures are below those reported, then your degree-days will be less. | |||||||||||||
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| 1. Forecasted temperatures are for Mendota CA and were accessed from the National Weather Service San Joaquin Valley Internet web site. Forecasts from AccuWeather.com and intellicast.com may also be used in the calculation. | |||||||||||||
| 2. The degree-day accumulations are calculated using the single triangle method and a lower threshold of 60°F with no upper threshold. | |||||||||||||
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