1. Section 5.3 – Estimating Land Requirement
Nutrient Management
Section 5.3 – Estimating Land Requirement
Adapted CNMP Core Curriculum
Presented by:
Roberto Maisonnave, Ag Engineer & M. Sc.
International Environmental Consultant

2. Objectives
Relation between number of pigs with crop land needed for the agronomic usage of manure.
Impact of your waste treatment system in the annual volume of available manure and nutrients.
Relevance of the agricultural cropping system in your manure management plan.

3. Manure Nutrients Production
Number of Animals
Nitrogen
Phosphorus Hd
Kg/yr 1
8,55
3,26
5.000
42.750
16.300
These values are only a function of animal type, live weight and diet
Relatively uniform within a reasonable range

4. Treatment & Storage N & P
Number of Animals
NITROGEN Kg/yr
(after losses)
Produced
Anaerobic Lagoon
Aboveground
tank
100%
50%
80%
5.000
42.750
21.400
34.200
Number of Animals
PHOSPHORUS Kg/yr
(after losses)
Produced
Anaerobic Lagoon
Aboveground
tank
100%
20%
90%
5.000
16.300
3.250
14.650
Ammonia-N volatilization is the main process of N loss to the atmosphere
Nitrification / denitrification?
Sedimentation is the main physical process involved in P loss from the liquid phase
Solid Separation? Composting?
The 80% sedimentation factor is a function of proper anaerobic lagoon design.
Solid separation and composting will not necessarily reduce the available phosphorus in the lagoon liquid fraction but it will anticipate the moment of usage.
Solid settlement in anaerobic lagoon bottom will defer the need of land application to the end of lagoon life time.
The role of microbes…

5. Land Application System AL vs ST
Number of Animals
AVAILABLE NUTRIENTS Kg/yr
(after losses)
Sprinkler Irrigation broadcasted
Underground Injection
50%
90%
N 90%
100%
5.000
10.700
2.950
19.250
3.250
Number of Animals
AVAILABLE NUTRIENTS Kg/yr
(after losses)
Surface Broadcasted
Underground Injection
40%
70%
N 90%
100%
5.000
13.700
10.250
30.780
14.650
N-NH3 Volatilization
P drift and minimal runoff

6. Available Nutrients Summary
Manure Production AL SI UI
Kg/yr
N & PAN*
42.750
21.400
10.700
19.250 P
16.300
3.250
2.950
AL: Anaerobic Lagoon
SI: Sprinkler Irrigation
UI: Underground Injection
PAN*: Plant Available Nitrogen

7. Cropping System Crops / year: Corn, Wheat/Soybean, garden crops
Tillage system
Fallow period
Decay time for manure decomposition (direct human consumption crops)

8. Land Requirement Example #1
Excreted N
Storage Tank with Manure Injection
Lagoon with Broadcast Application
Hectares per 1,000 sows
58 hectares
35 hectares
14 hectares
Hectares per 1,000 nursery pigs
17 hectares
10 hectares
4 hectares
Hectares per 1,000 slaughter pigs produced
40 hectares
24 hectares
Hectares per 5,000 slaughter pigs
200 hectares
120 hectares
50 hectares
kg/ha 22 kg N/ton grain
N-based application

9. Land Requirement Example # 2
Number Animals N
P2O5
Anaerobic Lagoon + Sprinkler
Soy-N
Soy-P
Corn-N
Corn-P
Kg/yr
Ha/yr
SOW
2.000
24.777
19.343 17 42 28 38
NURSERY
7.000
23.338
23.090
116 45
FINISHER
14.000 83
232
136
205
TOTALS
23.000
117
390
192
289
Swine Ex AU excel file
kg/ha Corn, kg/ha Soybeans

10. Unbalance Manure N/P ratio
Generally,
Manure: 5N / 1P
Crop Uptake: 3N / 1P
N based application: P over application
P based application: N shortage

11. Summary
5.000 Finishing Site will produce a fairly constant amount of manure, nitrogen and phosphorus.
Select a Treatment & Storage and Land Application System that not only comply with Environmental Regulations but also fit in your agricultural production scenario.

12. Summary Cropping system is flexible but SOIL AG POTENTIAL is not.
Be realistic about crops and yields.
Different crops and rotations for different soil nutrient scenarios.