Abstract
Swampland development such as acid sulphate soil for agricultural cultivation has various problem, including high soil acidity, fluctuated and unpredictable water flooding and the presence of toxic elements such as Fe which resulting in low crop yields. The research was conducted at the experimental station Belandean, Barito Kuala regency in dry season 2007. The objective of research was to study the effect of rice straw on the dynamic of soil pH, the concentration of iron and sulphate and yield on tidal land acid sulphate soil at two different water inlet channel. This research was designed in RCBD (Randomized Completely Block Design) with five treatments (0, 2.5, 5.0, 7.5 and 10 Mg ha-1) and four replications. Dolomite as much as 1 Mg ha-1 was also applied. This research was divided into two sub-units experiment i.e. two conditions of different water inlet channel. The first water channels were placed with limestone and the second inlet was planted with Eleocharis dulcis. The results showed that (i) rice straw application did not affect the dynamic of soil pH, concentration of iron and sulphate, and (ii) the highest yield was obtained with 7.5 Mg ha-1 of rice straw.
Highlights
Swampland has an important role in agriculture development
Organic acids that produced from rice straw decomposition process is dominated by acetic acid that buffer the process of soil pH
Carboxyl group dissociation that can occur at pH 39 (Tan 1986), so that straw can cause reductive condition but remains statistically not different on pH values among treatments.Figure 1 shows a higher pH value at 10 WAP observation. It was the reaction of dolomite which was slower in release (Kuswandi 1993), Ca and Mg ions were produced from the hydrolysis process of lime sufficient to neutralize soil acidity so that the soil pH increased
Summary
Swampland has an important role in agriculture development. The development of acid sulphate soils have several constraints including high soil acidity. Soil acidity can be reduced by applying ameliorant such as organic matter and lime. CaCO3 increased rice yield 30% on acid sulphate soils type B Unit Tatas, Central Kalimantan. Application of 2.0 Mg ha -1 CaCO 3, increased rice yield by 20% on acid sulphate soils type C Barambai, South Kalimantan (Noor 2004). Combination of rice straw (5.0 Mg ha-1) with lime (3.5 Mg ha-1) increased soil pH from 4.32 to 4.50, decrease the concentration of Fe2+ and SO42-, as to. S Nurzakiah et al.: Soil Chemical Properties and Rice Yield on Acid Sulphate Soil of materials such as rice straw ameliorant and lime and water management, combined with the use of biofilter) could increase productivity of soil and plant. The objctive of the present study was to study the effect of rice straw on the dynamic of soil pH, the concentration of iron and sulphate and the rice yield on tidal land acid sulphate soil at two different water inlet channel
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