Abstract
The descriptive explored study was conducted in districts Bumi Nabung, Sari Bakti, Seputih Banyak and Rumbia, Central Lampung, Indonesia. The parameters observed consisted of chemical and biological aspects of soil, which directly affected plant growth. This activity was carried out as preliminary studies for the diagnosis of soybean extensification on acid dry land. The results showed that all locations observed were less suitable for soybean development, indicated by low pH values (4.35 – 6.00), nutrient contents (N < 0.1% and C-organic < 2.0%), and low soil microbial populations. Population of bacteria was 17 × 103 – 29 × 104 CFU g-1 soil and fungi was 21 × 101 – 63 ×102 CFU g-1 soil of soils. Beneficial microbe types included non-symbiotic nitrogen-fixing bacteria (with the capability to fix the Nitrogen around 0.16 – 1.53 mM 100 ml-1 medium h-1), phosphate solubilizing bacteria (with the value index 1.22 – 6.25) and arbuscular mycorrhizal fungi (with root colonization by 70.50 – 90.33% and the number of sporeswere 49 – 175 spores g-1 soil). This less suitable land can be improved to become suitable for developing soybean by using innovative technology. Soil biological and chemical improvement technology through liming and amelioration as well as organic and bio-fertilizers applications were required for soybeans extensification on acid dry land.[How to Cite: Prihastuti and Sudaryono. 2013. Soil Chemical and Biological Characteristics for Diagnostic the Potency of Acid Dry Land for Soybean Extensification. J Trop Soils, 18 (1) : 17-24. doi: 10.5400/jts.2013.18.1.17][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.1.17]
Highlights
The acid dry land has a great potential to be expanded as the effort for planting soybeans. Sudaryono et al (2007) reported that an identification of acid dry land issues included: limited water availability, acidic pH, sensitively high erosion, fertilization and amelioration not appropriate, nutrient leaching and toxicity of Al, low levels of soil organic matter, low fertilization efficiency, and degradation of productivity
Isolation of microbial was carried by Nitrogen Fixation Bacterial (NFB) selective medium for symbiotic nitrogen-fixing bacter ial presented by Vincent (1970) with compositions of KH2PO4 0.4 g; MgSO4.7H2O 0.2 g; NaCl 0.1 g; CaCl2.2H2O 0.026 g; FeCl3.6H2O 0.017 g, Na2MoO4.2H2O 2 mg; DL-malic acid 3.58 g; bromothymolblue 0.025 g; agar 1.75 g, and distilled water to 1 L
Plant growth or soil microbial population dynamics were determined by soil properties in which as growth environment (Cao et al 2008)
Summary
The acid dry land has a great potential to be expanded as the effort for planting soybeans. Sudaryono et al (2007) reported that an identification of acid dry land issues included: limited water availability, acidic pH, sensitively high erosion, fertilization and amelioration not appropriate, nutrient leaching and toxicity of Al, low levels of soil organic matter, low fertilization efficiency, and degradation of productivity. The acid dry land has a great potential to be expanded as the effort for planting soybeans. Sudaryono et al (2007) reported that an identification of acid dry land issues included: limited water availability, acidic pH, sensitively high erosion, fertilization and amelioration not appropriate, nutrient leaching and toxicity of Al, low levels of soil organic matter, low fertilization efficiency, and degradation of productivity. Management of acid dry land is required to improve crop productivity optimally. Acid dry land management strategies can be done through a high input by liming and fertilizing P or low input by addition of organic manure, crop rotation, legumes and alley cropping, integrated management, increasing nutrient efficiency, organic-inorganic fertilizer combination (Vestberg et al 2002). The biological management of acid dry land is surely being interesting to achieve sustainable agricultural systems.
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