CD Disertasi

Model Dinamis Pengelolaan Nitrogen Pada Tanah Gambut Untuk Pengembangan Kelapa Sawit Berkelanjutan Di Kabupaten Rokan Hilir Provinsi Riau

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This research was carried out from January 2022 to December 2023, at PT Tunggal Mitra Plantation, Manggala 3 Palm Oil Plantation, Rokan Hilir Regency, Riau Province. The research was divided into two stages, where the first stage was a field experiment that ran for two years which aimed to determine the effect of ameliorant application on the chemical and biological properties of peat soil as well as the application of nitrogen fertilizer on CO2 emissions and the rate of eutrophication as well as the efficiency of nitrogen nutrients by oil palm plants. on peat land. The second stage is social research, namely the community's perception of the existence of oil palm plantations and the impact of plantations on environmental, social and economic aspects of the community around the plantation unit.
The aim of the research is to obtain nitrogen nutrient use efficiency study (agronomic efficiency, physiological efficiency and recovery efficiency) by oil palm plants in peatlands. Analyzing the influence and relationship of nitrogen fertilizer application on carbon emissions (CO2) and the level of eutrophication in oil palm plantation areas on peatlands. analyzed the effect of ameliorant application on nitrogen nutrient status and soil microbiology in oil palm plantations on peatlands. Analyze the analysis of oil palm farming on peatlands and community perceptions of the existence of oil palm plantations. Obtaining a recommendation system for fertilizing nitrogen nutrients in oil palm plants on peatlands. Obtaining a nitrogen management model in peat soil for sustainable oil palm development

The research results showed that the application of boiler ash at doses of 1.5 and 3 tons/ha/year significantly increased the production of fresh fruit bunches (FFB) by 4.61 tons/ha/year and 6.66 tons/ha/year respectively. compared to plots without boiler ash application. The increase in FFB production due to boiler ash application was mainly due to an increase in bunch weight, where the application of 1.5 tons of boiler ash/ha/year and 3 tons of boiler ash/ha/year respectively increased bunch weight to 14.22 kg and 15.07 kg. Application of nitrogen fertilizer (Ammonium Sulphate) at a dose of 0.45 kg nitrogen and 0.9 kg nitrogen increased production yields by 7.94 tons/ha/year and 6.2 tons/ha/year respectively compared to the control plot.

The application of boiler ash did not have a significant effect on vegetative growth, however the application of Nitrogen fertilizer increased the parameters of the petiole cross section. Application of nitrogen fertilizer at a dose of 0.45 kg/principal/year increased the cross-sectional area of the midrib to 29.74 cm2 compared to the control plot, while application of nitrogen fertilizer at a dose of 0.9 kg/palm/year increased the cross-sectional area of the midrib to 31.78 cm2 or 19.3% of the control plot. From observation data, it was found that the CO2 emission value in the research plot was in the range of 0.35 – 0.84 g/m2/hour or the equivalent of 30.35 – 73.74 tonnes/ha/year. The application of boiler ash had no significant effect on soil CO2 emissions, while the application of N fertilizer at high doses significantly increased CO2 emissions. The reduction in CO2 emissions by application of boiler ash was recorded to occur for more than 50 days after the application of boiler ash, after the 55th day a pattern of increase in emissions occurred, the plot with nitrogen fertilizer application of 0.9 kg N/palm/year gave the highest CO2 emission value during two months of mass observations.

The total population of nitrifying bacteria cultured in Nitrosomonas sp specific media (TSIA) and Nitrobacter sp specific media (Burk's media) from each treatment, total bacteria cultured in TSIA media varied from 95 x 103 cfu/g soil to 231 x 103 cfu/g soil, where boiler ash treatment did not have a significant effect on the number of bacterial populations, but on the contrary the application of nitrogen fertilizer had a real effect in increasing population of bacteria Nitrosomonas sp. The number of bacteria obtained on Burk's media varied between 96 x 103 cfu/g soil to 277 x 103 cfu/g soil. However, both application of boiler ash and nitrogen fertilizer did not have a significant effect on the number of bacterial populations in Burk's media. The total bacteria in Abhy's media ranged from 51 x 103 cfu/g soil to 143 x 103 cfu/g soil. The application of boiler ash significantly reduced the total bacterial population on Abhy's media, while the application of nitrogen fertilizer had a significant effect on the total bacterial population. On NFb media the total number of bacteria obtained was in the range of 31 x 103 cfu/g soil to 141 x 103 cfu/g soil.

Analysis of farming operations on all experimental plots shows that all combination treatments of boiler ash application and nitrogen fertilizer provide benefits with an R/C ratio >1. The combination that provides the highest R/C is the application of high doses of boiler ash and low doses of nitrogen fertilizer with an R/C ratio of 3,25. Where fertilizer costs are the largest cost component in oil palm plantation, followed by harvest and transportation costs. The majority of public society's perception around the operational areas of oil palm plantations is that oil palm plantations provide a good impact on economic, social and environmental aspects. The fertilizer recommendation system obtained in this research not only considers agronomic variables such as nutrient content and yield response but also environmental factors, namely total CO2 emissions with the response curve equation Production response = 183.64 – (0.06 x Agronomic efficiency) + (1, 45 x total leaf cations) – (108.17 x nitrogen content in leaves) + (0.41 x CO2 emissions). The dynamic model for managing nitrogen nutrients in oil palm plants on peatlands uses variables: Intensive fertilization in oil palm plantation areas, the economic value of oil palm and improving the standard of living of communities around the oil palm plantation units


Keywords: Dynamics Model, Peat, Nitrogen Fertilizer, Soil Ameliorant, CO2 flux, Oil Palm.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

2110347539

Penerbit

Pekanbaru : Universitas Riau PASCASARJANA DISERTASI S3 Ilmu lingkungan., 2025

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

2110347539

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

DISERTASI S3 ILMU LINGKUNGAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

Mutia

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