| Summary: | This research aimed to obtain local specific technology for recommendations of maize farming at various overflow types of tidal swamp land. The method used were field survey, laboratory analysis and field experiment, consisted of four stages, namely: 1) preparation of operational maps, 2) field survey and soil analysis, 3) land suitability evaluation, and 4) field experiment. Preparation of operational maps aimed to create a work map at 1 : 20,000 scale used for operations in the field. The survey included ground check, observation of the physical body of soil and environmental factors, and as well as observations and descriptions of physiographic landform. Soil samples from each representative soil unit were analyzed in the laboratory. Analysis of land suitability was determined by comparing land use requirements of maize crop with land qualities/land characteristics. The experimental design used was a nested design. Treatment consisted of two factors: the type of overflow and land management factors, each treatment was repeated 3 times. Maize crop of Sukmaraga variety was used with spacing of 20 x 75 cm, in 4 x 5 m2 plot size. The data were analyzed using Analysis of Variance (ANOVA), followed by Least Significant Difference test, and then a financial analysis was also carried out.
The results showed that Sungai Bulan area was categorized as tidal swamp wetlands agroecosystem with four types of overflow, i.e. type of A, B, C, and D. The overflow type of A on LMU 2, type B and C on LMU 1, and type D on LMU 5. The actual land suitability class for maize was mostly marginally suitable (S3) on the LMU 1, LMU 2, LMU 3, LMU 5 with the major limiting factors were the availability of water, oxygen availability, rooting condition, nutrient retention, toxicity of sulfidic, and flooding hazard., whereas not suitable (N) on LMU 4 with the limiting factor was the thickness of peat (> 200 cm). The potential land suitability class for maize were mostly slightly suitable (S2) on LMU 1, LMU 2, LMU 5, and marginally suitable (S3) on the LMU 3 with the major limiting factors were the availability of water, rooting condition, and toxicity of sulfidic, whereas not suitable (N) on the LMU 4 with the limiting factor was the thickness of peat (> 200 cm).
Land with overflow type of A on LMU 2 and type B on LMU 1 that made mound on the surface with one way flow system and the flap gates, application the lime of 2 tons/ha, compost from livestock manure and straw of maize dose of 2 tons / ha each, N fertilizer 161 kg/ha, P2O5 90 kg/ha and K2O 93 kg/ha produced the highest yield of dry loose of maize 3.9 tons/ha and 4.2 tons/ha, respectively. Land with overflow type of C on LMU 1 and type D on LMU 5 that made of technology of conservation irrigated system and watering, application the lime of 2 tons/ha, compost from livestock manure and straw of maize dose of 2 tons / ha each, N fertilizer 161 kg/ha, P2O5 90 kg/ha and K2O 93 kg/ha produced highest yield of dry loose of maize 4.2 tons/ha and 5.5 tons/ha, respectively.
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