Pedosphere 25(5): 790--798, 2015
ISSN 1002-0160/CN 32-1315/P
©2015 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of biochars and other organic soil amendments on plant nutrient availability in an Ustoxic Quartzipsamment |
T.KONGTHOD1, S. THANACHIT1 ,
S.ANUSONTPORNPERM1 and
W.
WIRIYAKITNATEEKUL2 |
1Department of Soil Science, Faculty of Agriculture,
Kasetsart University, Chatuchak, Bangkok 10900 (Thailand)
2Sciences of Land Development, Land Development
Department, Bangkok 10900 (Thailand) |
| ABSTRACT |
| A sandy soil, Nampong soil (classified as Ustoxic
Quartzipsamment), was incubated under controlled condition
i) to compare the mineralization of major plant nutrients
derived from different types of biochars and other organic soil
amendments; ii) to examine their effects on soil properties and plant
nutrient availability; and iii) to evaluate the plant
nutrient losses in leachate from the rooting zone of soil
incorporated with the different amendments. The experiment was
arranged in a
completely randomized design with 3 replications. Five
treatments of soil amendments used were cassava stem base
biochar (CSB), rice husk biochar (RHB), chicken manure
(CM), compost (CP), and no amendment application
(control). The RHB treatment released the highest amounts of
mineralized NO3--N, available P and K
(2.30--17.26, 5.50--42.90 and 43.00--187.63 mg kg-1,
respectively) while the CM treatment releasing the highest
NH4+-N in the range of 1.86--53.67 mg
kg-1. The CSB and RHB treatments showed better
continuity of mineralization of nutrients than the
treatments of CM and CP, particularly in the case of the
CSB treatment. In the soil column incubation experiment,
the amounts of NH4+-N and NO3--N in all
treatments barely changed on Day 1 to Day 30 of incubation
and then the amounts increased markedly on Day 60. On Day
60, the RHB treatment contained a very high amount of
NO3--N (> 250 mg kg-1). This
suggests that N would become more available 30 d after the
incorporation. The CM treatment gave the highest amounts of
organic matter and available P in the ranges of 4.64--8.94
g kg-1 and 14.41--36.33 mg kg-1, respectively,
during the 60-d column incubation. The CSB treatment tended
to have higher available K throughout the measuring period.
The NO3--N was leached from the soil column quite
quickly on Day 1 of incubation while the loss of
NH4+-N decreased slightly from Day 1 until the
end of the measurement. The amounts of P and K
losses varied with the type of soil amendments, and the
pattern of the loss was irregular. |
| Key Words: cassava stem base biochar, chicken manure, compost,
mineralization, rice husk biochar, sandy soil |
| Citation: Kongthod, T., Thanachit, S., Anusontpornperm, S. and Wiriyakitnateekul, W. 2015. Effects of biochars and other organic soil amendments on plant nutrient availability in an Ustoxic Quartzipsamment. Pedosphere. 25(5): 790-798. |
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