The Role of Soil Organic Matter and Manures in Sustainable Nutrient Cycling - Sustainable Management of Soil Organic Matter - page 281

Table 4.8.1. Estimates of N, P and K inputs and outputs for a model organic upland/hill farm with
sheep and suckler beef (total area 390 ha).

N
(kg ha − 1 )

P
(kg ha − 1 )

K
(kg ha − 1 )

N
(kg ha − 1 )

P
(kg ha − 1 )

K
(kg ha − 1 ) Inputs Outputs

Fixation 6.2 0 .1 0 .1 Stock sales

Deposition 12.5 0.1 3.3 Cattle 1.2 0.4 0.1

Stock purchases ~0 .1 ~0 ~1 ~0 .3~ Sheep 1.3 0.2 0.1

Bought-in feed 2.4 0.2 0.5 Wool 0.4 ~0 .~1 0.1

Seed ~0 .1 ~0 ~.1 ~0 .3~

Straw 0.2 0.1 1.1 Burning 0.1

NH 3 volatilization 1.8

Total 21.3 0.4 4.9 4.8 0.6 0.3

Balance +16.5 − 0.2 − +4.6 +

Table 4.8.2. Estimates of N, P and K inputs and outputs for a model organic lowland dairy farm
(total area 56 ha).

N
(kg ha − 1 )

P
(kg ha − 1 )

K
(kg ha − 1 )

N
(kg ha − 1 )

P
(kg ha − 1 )

K
(kg ha − 1 ) Inputs Outputs

Fixation 117 Stock sales 4 1.0 0.3

Deposition 20 0.2 3.3 Milk 33 6.0 9.0

Bought-in feed 18 2.0 5.0 NH 3 volatilization 14

Seed 1 0.1 0.2

Straw 3 0.9 7.0

Total 159 3.2 15.5 51 7.0 9.3

Balance +108 + − 3.8 − +6.2 +

Table 4.8.3. Estimates of N, P and K inputs and outputs for a model organic stockless arable/
horticultural farm.

N
(kg ha − 1 )

P
(kg ha − 1 )

K
(kg ha − 1 )

N
(kg ha − 1 )

P
(kg ha − 1 )

K
(kg ha − 1 ) Inputs Outputs

Fixation 79 Crop sales 58 .2 10.0 64

Deposition 20 0.2 3

Seed 5 0.7 3 NH 3 volatilization ~0

Compost 50 11.0 38

Total 154 11.9 44 58 .2 10.0 64

Balance +96 .+2 +1.9 + − 20 −