FREE TRAINING VIDEOS
Do you want to create a plan for reducing nitrogen, phosphorus, and sediment? These videos are for you! Learn how to create a scenario and analyze the results using Chesapeake Assessment Scenario Tool (CAST).
How is Manure Treatment Technology credited differently than Manure Transport? What is the difference between all 19 different types of Manure Treatment Technology?
Manure transport simply moves the manure from one location to another and then the replacement nutrients are applied in the source location. Manure Treatment Technology works the same way but also includes a reduction based on the treatment and an added load due to ammonia volatilization. A reference guide is available that discusses the types of Manure Treatment Technology. It may be downloaded from the CAST home page under BMPs, Models and Geography. The direct link is:
What level of N and P load reductions are achieved for removing a ton of manure from the watershed?
This amount is highly variable and depends on the number and type of animals in a county, crop need, and acres of manure-receiving land uses. For nitrogen, the load is likely to increase with additional implementation of Manure Transport and Manure Treatment Technologies. An estimate of the load reduction by BMP is available for all counties for nitrogen as well as phosphorus by downloading the spreadsheet named BMP Pounds Reduced and Costs under the heading Cost Effectiveness of BMPs at: http://cast.chesapea">55 min
Upcoming Webinars
Join us for Watershed Planning with CAST: Aligning Local Actions to the Revised Chesapeake Bay Agreement to learn how to use CAST to develop watershed plans that reflect the Bay Agreement's updated goals. This session will highlight what's new in the Agreement, demonstrate CAST's planning tools, and show how to prioritize actions that deliver both nutrient reductions and community co-benefits.
- Topic: Watershed Planning with CAST: Aligning Local Actions to the Revised Chesapeake Bay Agreement
- Time: October 16, 2025 at noon EDT
- Join Zoom Meeting
- Meeting ID: 868 4886 3846
- One tap mobile +13017158592,,86848863846#
Join us for a conversation wiing at managing a larger area, like a state, then phosphorus reductions can be seen from manure transport. The impact depends on multiple factors like crop need, amount of manure, acres of cropland, and other BMPs in the scenario.
How can I determine which counties have manure in excess of crop need?
Login to CAST and navigate to Results>Reports. Select the report type of Nutrients Applied. You can request the report for multiple counties for a scenario. This report includes the amount of manure and fertilizer applied to meet the crop need. There are columns with the amount of crop need, manure and fertilizer. Note that eliminating manure does not bring the loads down. You also must reduce the crop need using the Nutrient Management Core BMP. You can see the amount of crop need met in this same report in the column named Total N App to Crop Need. Implementing 100% of Nutrient Management Core will produce the lowest crop need.
The difference in nutrient concentrations by animal types may be found in the manure source data file that can be downloaded from: http://cast.chesapeakebay.net/Home/SourceData. It varies by year, county and animal type.
What is the different effect of transporting manure between