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The Confluence

The Confluence is the blog of the California Institute for Water Resources (CIWR) within University of California Agriculture and Natural Resources. We cover timely topics of water management in California, highlighting innovative research and voices. CIWR's mission is to integrate California's research…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Know Your Elevation When Canning

May 14, 2026
Make your altitude adjustments. Did you know that at altitudes over 1,000 feet above sea level, you need to make adjustments to your canning procedures? When boiling water or steam canning, processing times need to be lengthened. When pressure canning, pressure needs to be increased. Why? Because as…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: The Top 5 Pathogens that Cause Foodborne Illness

May 14, 2026
There are 31 reasons to follow safe food handling procedures. Bacteria and other microorganisms (such as parasites and viruses) are everywhere.  They’re in the soil and water, they float through the air, they’re on plants and are in and around animals, and they’re even on people. The good, the…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Remove Foil from Baked Potatoes Immediately for Safety

May 14, 2026
Baking potatoes in foil is a safety concernBaking potatoes in aluminum foil is a common way of preparing this root vegetable.  Doing so makes the skin soft, and some say that it makes the potatoes cook faster.  The foil can also keep the potatoes hot longer once they come out of the oven – and this…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Canning Breads is Unsafe

May 14, 2026
Cake and quick bread should never be "canned."Pretty pictures and recipes for quick breads and cakes canned or baked in canning jars (aka mason jars) often circulate on the Internet, especially around the holidays.  Despite what some well-intentioned bloggers may say, the practice of canning breads and…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Bubbles in Canning Jars Can Be Bad News

May 14, 2026
Distinguish between bubble types to determine safety.It’s not uncommon to see tiny bubbles in glass canning jars; these are generally not a concern. But large bubbles in the glass are manufacturing defects. They indicate weak points in the walls of the jars which could spell trouble during the canning…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: There Are No Home Canning Recommendations for Dairy Products

May 14, 2026
No canning of butter, cheese, cream, yogurt, etc. will produce a safe product.Aside from a very tiny bit of butter that may be used to reduce foaming when canning jams and jellies, there are no home canning recommendations for dairy products, including butter, hard and soft cheeses, milk, and yogurt.Many …
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Canning Water

May 14, 2026
Should you process water for storage and emergency use? Experts recommend that households store at least a three-day supply of water per person to cover drinking and food preparation needs in the event of an emergency.  With a minimum daily recommended amount of one gallon of water per person per…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Only Certain Fruits May Be Safely Canned for Baby

May 14, 2026
Be extra cautious preserving your own baby food. Want to preserve your own baby food?  High-acid fruits are the only food for which there are home processing recommendations for use as baby food. Unfortunately, there are no recipes for canning pureed or mashed vegetables, meat or poultry. …
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Is it Safe to Can Previously Frozen Produce?

May 14, 2026
Safety and quality depend on what you have in the freezer.If you’ve got an excess of produce that you don’t have time to process, can you store it in the freezer to can later? Yes, sometimes. The freezing process breaks down the cell structure of produce, which changes the density of the food. For this…
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UC Master Food Preservers of Central Sierra: Article

Preserve it! Series: Canning Fruit Purees

May 14, 2026
Applesauce isn't the only game in town! Turning bushels of apples into home-canned applesauce is a time-honored tradition for many folks. But why stop at plain applesauce, or even apples for that matter?  Many fruits can be processed as fruit purees, and fruits can be mixed and matched.  …
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