Exercise 5. Prioritizing Fields for Manure Allocation
(adapted from Wolkowski et al. 1994)

 

1.  It is spring and you will soon be able to land apply manure. You would like to establish the priority based on physical site characteristics, management and nutrient levels. You have three fields that you feel are acceptable candidates. The following are different characteristics of the individual fields. Fill out the following form for the three fields based on the information given.


Field 1 Field 2 Field 3
Planned crop canola barley silage good legume stand
Soil test P 90 270 125
Soil test K 500 3200 380
Soil landscape model DERK 1/U1l BOV1/U1h-r MDP1/U1l
Soil texture clay loam loamy sand sandy loam
Slope 2-5% 7% <2%
Depth to sandstone bedrock 15 feet 15 inches 6 feet

Fields 1 and 3 have no surface water within or bordering them. Field 2 has a seasonal creek dissecting the inclined slope.

 

Category Points Category points
Field 1 Field 2 Field 3
Planned crop
(points based on crop nitrogen requirements)
potatoes 10      
canola 8      
corn 8      
first-year corn following forage legume 1      
non-forage legumes (peas, beans, lentils) 2      
cereal grains (removed as grain) 4      
cereal grains (removed as silage) 5      
prior to direct seeding forage legume 8      
topdress good legume stand 1      
topdress fair legume stand 2      
topdress poor legume stand 3      
grass pasture or other non-legumes 7      
Soil test results
(select one from each category)
Phosphorus  
> 200 ppm 1      
100-200 ppm 3      
20-100 ppm 5      
< 20 ppm 10      
Potassium  
> 3000 ppm 6      
250-3000 ppm 8      
< 250 ppm 10      
Site/soil limitations (select one from each category)
Surface and groundwater proximity  
Applied and incorporated within 10-year floodplain or within 200 feet of surface water or groundwater access 1


Application outside the above restrictions 5      
Slope        
> 9% 1      
6-9% 3      
2-6% 5      
<2% 10      
Soil texture        
Sands, loamy sands 1      
Sandy loams, loams; Or loamy sands spring applied 3      
Other soils; Or sandy loams, loams spring applied 5      
Depth to bedrock        
O - 10 inches (0 - 25 cm) 0      
10 - 20 inches (25 - 50 cm) 1      
> 20 inches (> 50 cm) 5      
Total (highest value indicates field with highest priority)        

2.  Using information from your own fields, redo the exercise and prioritize your fields for manure allocation.