The effect of different types of organic fertilizer on the availability of nitrogen in
paddy soil was determined. The soil samples were collected from an organic rice field in
Nongchok District, Bangkok. The results showed that the soil pH of all treatments increased
from 5.3 to 6.9 and 7.2. The cumulative N mineralization of sunn hemp was the highest
(121.33 mg N/kg), but no significant difference was compared to for other organic fertilizers.
The change of AHN was increased at the start of incubation and decreased after 70 days of
incubation. It indicated that the AHN changed to ammonium. The potential N mineralization of
control, cow manure, compost and sunn hemp were 95.34, 109.90, 107.23 and 114.53 mg N/kg,
respectively. The K values indicated the mineralization rate of control, cow manure, compost
and sunn hemp which were 0.2095, 0.2075, 0.2053 and 0.1992 mg N/kg, respectively.
Keywords
Nitrogen, Organic fertilizers, Paddy soil
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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