4 tGMLha−1 was applied. A similar trend occurred in cycle
2 of the experiment. These results seem to confirm that the
suitable rate of GML application for ameliorating the
infertility of acid sulphate soils in Malaysia is 4 t ha−1.
Ground basalt application at 4 t ha−1 (T4) lowered Al in the
solution from 24·20 to 2·15 mg kg−1. This value is slightly
above the critical Al concentration for rice production of
2mgkg−1 as mentioned by Dent (1986). The exchangeable
Al in the soil after treating it with 4 t ground basalt ha−1 was
2·64 cmolc kg−1 (Table VI). At this rate of application, the
exchangeable Al was reduced to 0·24 cmolc kg−1 in cycle 2
(Table VII). This happened because of more dissolution of
ground basalt as time went by. It means that it is better to
sow rice after a ground basalt‐treated soil has undergone at
least one wet‐and‐dry cycle. Again, it is shown that ground
basalt is as good as GML for ameliorating acid sulphate
soils in Malaysia.
In T10 where ground basalt was applied in combination
with organic fertilizer, solution Al was 1·96 and 0·73mg g−1
in cycles 1 (Table IV) and 2 (Table V), respectively. For
exchangeable Al, the corresponding values were 1·45
(Table VI) and 0·33 cmolc kg−1 (Table VII). It seems that
organic matter had some effects on the availability of Al in
the soil. This is consistent with the findings of Hoyt and
Turner (1975) and Hue and Amien (1989) who believed that
Al could be fixed by organic matter via chelation. It is
therefore suggested that for maximal ameliorative effect,
ground basalt should be applied together with organic matter
(e.g. organic fertilizer).
4 tGMLha−1 was applied. A similar trend occurred in cycle
2 of the experiment. These results seem to confirm that the
suitable rate of GML application for ameliorating the
infertility of acid sulphate soils in Malaysia is 4 t ha−1.
Ground basalt application at 4 t ha−1 (T4) lowered Al in the
solution from 24·20 to 2·15 mg kg−1. This value is slightly
above the critical Al concentration for rice production of
2mgkg−1 as mentioned by Dent (1986). The exchangeable
Al in the soil after treating it with 4 t ground basalt ha−1 was
2·64 cmolc kg−1 (Table VI). At this rate of application, the
exchangeable Al was reduced to 0·24 cmolc kg−1 in cycle 2
(Table VII). This happened because of more dissolution of
ground basalt as time went by. It means that it is better to
sow rice after a ground basalt‐treated soil has undergone at
least one wet‐and‐dry cycle. Again, it is shown that ground
basalt is as good as GML for ameliorating acid sulphate
soils in Malaysia.
In T10 where ground basalt was applied in combination
with organic fertilizer, solution Al was 1·96 and 0·73mg g−1
in cycles 1 (Table IV) and 2 (Table V), respectively. For
exchangeable Al, the corresponding values were 1·45
(Table VI) and 0·33 cmolc kg−1 (Table VII). It seems that
organic matter had some effects on the availability of Al in
the soil. This is consistent with the findings of Hoyt and
Turner (1975) and Hue and Amien (1989) who believed that
Al could be fixed by organic matter via chelation. It is
therefore suggested that for maximal ameliorative effect,
ground basalt should be applied together with organic matter
(e.g. organic fertilizer).
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)