Start Date

20-11-1996 12:00 AM

Description

Iowa swine producers market approximately 25 million hogs each year, 1.5 million beef cattle, 15.2 million chickens, 9 million turkeys, keep a million layers, and milk about 265,000 cows. Altogether an estimated 57 million tons of manure is produced in Iowa annually, over half a million tons per county. The value of manure nutrients (assuming 21 cents/Jb for nitrogen, 23 cents/lb for phosphorus, and 13 cents/lb for potassium) produced by hogs is $3.40 per head marketed. Beef animals in confinement produce approximately $27 per head marketed; dairy cows produce about $68 of manure nutrients every year. Even though millions of dollars worth of manure nutrients are produced, producers don't always use them efficiently. In a 1995 Rural Farm Poll, only 50% of Iowa producers said they take credit for manure nutrients. There are two reasons for producers to use manure efficiently: economics and environmental stewardship. There are two primary reasons why they don't take credit: lack of knowledge about nutrient content, and nutrient variability. This paper will address those two issues.

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Nov 20th, 12:00 AM

Manure Nutrients: Values and Variation

Iowa swine producers market approximately 25 million hogs each year, 1.5 million beef cattle, 15.2 million chickens, 9 million turkeys, keep a million layers, and milk about 265,000 cows. Altogether an estimated 57 million tons of manure is produced in Iowa annually, over half a million tons per county. The value of manure nutrients (assuming 21 cents/Jb for nitrogen, 23 cents/lb for phosphorus, and 13 cents/lb for potassium) produced by hogs is $3.40 per head marketed. Beef animals in confinement produce approximately $27 per head marketed; dairy cows produce about $68 of manure nutrients every year. Even though millions of dollars worth of manure nutrients are produced, producers don't always use them efficiently. In a 1995 Rural Farm Poll, only 50% of Iowa producers said they take credit for manure nutrients. There are two reasons for producers to use manure efficiently: economics and environmental stewardship. There are two primary reasons why they don't take credit: lack of knowledge about nutrient content, and nutrient variability. This paper will address those two issues.