Evaluation and Modeling of the Impact of Environmentally Friendly
11
leached below 2 m is low in the loam, regardless of whether broadcasting or
banding is used. Ammonia volatilization from the loam soil is also significantly
reduced by the banding. The difference in N uptake between banding and
broadcasting in the loam is relatively small.
Table 3. Interactions of application mode with soil type and N form
Soil
N
Applic.
Leached Volatiliz.
N
N storage
type
form
mode
N
uptake
N0 3 --N NH/-N
- {kg ha- I 2 -
NH/- Broadcast
139
42
89
19
1
Sandy
N
Band
92
12
124
53
8
loam
N0 3 -- Broadcast
215
0
69
7
1
N
Band
207
0
78
5
1
NH/- Broadcast
13
43
116
120
1
Loam
N
Band
12
16
122
138
9
N03-Broadcast
18
0
114
158
1
N
Band
17
0
124
147
1
3.4 Interaction of EFFPs with Banding
3.4.1 Influence of Soi/lnhibition Capacity
Table 4 shows that the quantity of leached N in the sandy loam decreases with an
increase in nitrification inhibition (BJ, which can be induced either by high local
ammonium concentrations or by NIs. Correspondingly, more nitrate-N remains in
the root zone at the end of a crop growth period. Some differences are found in N
uptake, which approaches its maximal value when Bl = 0.01. Without inhibition
(Bl =0) the uptake is somewhat lower. In the loam, N leaching below 2 m is small
for all cases regardless of Bl. Nitrogen uptake increases slightly with an increase
in B), approaching maximal N uptake when Bl = 0.1. Nitrate storage decreases and
the amount of stored ammonium increases as the inhibition capacity increases,
implying that N leaching in the loam is only delayed and the potential for postharvest losses is expected to grow without the inhibition effect.
3.4.2 Easi/y Dissolving Fertilizer vs. CRN Under Banding
Three types of fertilizers, CRN (NH/), EDF (NH/), and EDF (N03-), and their
interaction with a sandy loam and a loam soil were examined (Table 4). N
leaching obtained in the sandy loam with CRN ~ 1 was only 10% of the