Only certain forms of Nitrogen are suitable for controlled release in the tropics. Most
dump their Nitrogen.
IBDU Release Pattern (as used in Nurseryace and Woodace)
It is very difficult to say clearly the lasting period of effective nitrogen of IBDU,
because IBDU is naturally affected by climatic and local variation in soils and
temperature. To get the general idea, roughly estimated lasting period of IBDU is shown as
follows:
Influence of Various Factors on Lasting Period of effective Nitrogen IBDU
| Straight IBDU 31-0-0 |
CONDITIONS |
AVAILABILITY
LASTING PERIOD OF EFFECTIVE NITROGEN (WEEKS) |
| IB.N/TN |
Granule Size mm |
pH |
Water
Content * % |
Temp F |
2 |
4 |
6 |
8 |
10 |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
26 |
28 |
| 100 |
0.7-2.6 |
6 |
40 |
68 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 100 |
0.7-2.6 |
6 |
60 |
68 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 100 |
0.7-2.6 |
6 |
60 |
86 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* % of max. water holding capacity of soil. |