Mariatul Qifli, Anita Kisni (2008) Studi Nitrifikasi Tanah dengan Penambahan Seresah Asal Hutan Alami dan Agroforestri Kopi. Sarjana thesis, Universitas Brawijaya.
Abstract
Alih guna lahan hutan menjadi agroforestri kopi telah menurunkan jumlah dan kualitas seresah, meningkatkan laju dekomposisi dan mineralisasi seresah. Tingkat nitrifikasi tanah yang meningkat setelah alih guna lahan hutan menjadi agroforestri kopi dapat mencemari lingkungan melalui pencucian NO3 -. Pengelolaan bahan organik diharapkan mampu menekan tingkat nitrifikasi tanah setelah alih guna lahan hutan menjadi agroforestri kopi. Tujuan penelitian ini adalah mengukur tingkat nitrifikasi tanah dengan menambah seresah asal hutan alami, kopi campuran, kopi naungan legum (Gliricidia sepium) dan kopi monokultur. Hipotesis penelitian ini adalah penambahan seresah kopi monokultur menghasilkan tingkat nitrifikasi yang lebih tinggi dibandingkan penambahan seresah hutan alami, kopi campuran dan kopi naungan legum. Penelitian ini dilakukan pada bulan Mei-Juni 2005. Bahan yang digunakan adalah tanah dan seresah. Tanah yang digunakan adalah tanah Inseptisol, berasal dari kebun kopi monokultur di Bodong, Sumberjaya, Lampung Barat. Seresah yang digunakan berupa seresah yang dikumpulkan menggunakan littertrap. Seresah berasal dari sistem penggunaan lahan (SPL) hutan alami, kopi campuran, kopi naungan legum (Gliricidia sepium) dan kopi monokultur. Percobaan disusun dalam Rancangan Acak Lengkap (RAL), inkubasi aerob selama 8 minggu di laboratorium dengan 5 perlakuan penambahan seresah asal hutan alami, kopi campuran, kopi naungan legum (Gliricidia sepium), kopi monokultur dan kontrol (tanpa penambahan seresah). Setiap perlakuan dilakukan ulangan sebanyak 4 kali dan 6 waktu pengukuran yang dilakukan 1 minggu 1 kali. Pot percobaan menggunakan polibag volume 250g dan total pot percobaan sebanyak 120pot.Penelitian ini merupakan percobaan inkubasi aerob selama 8minggu. Pengukuran dilakukan setelah menambah seresah ke dalam tanah dan terikubasi selama 2 minggu. Tingkat nitrifikasi ditentukan dengan cara membandingkan konsentrasi NH4 + dan NO3 - setelah penambahan seresah. Analisis data menggunakan analisis ragam dengan program SPSS 13. Hasil penelitian menunjukkan (1) penambahan seresah berpengaruh sangat nyata (p<0.01) terhadap konsentrasi NH4 +, NO3 - dan N-mineral tanah (2) Penambahan seresah berpengaruh sangat nyata (p<0.01) terhadap peningkatan nisbah NH4 +/NO3 - (3) Penambahan seresah kopi monokultur menghasilkan konsentrasi NO3 - lebih tinggi dari seresah hutan alami dan kebun kopi campuran (4) penambahan seresah kopi monokultur menghasilkan nisbah NH4 +/NO3 - paling rendah (0.1mg kg-1) dibandingkan penambahan seresah hutan alami (1mg kg-1), kopi naungan legum (0.8mg kg-1) dan kopi campuran (0.4mg kg1). Hasil penelitian mengindikasikan penambahan seresah yang lebih beragam seperti seresah hutan dapat menekan tingkat nitrifikasi tanah sebesar 96%.
English Abstract
Forest conversion to coffee agro forestry has decreased quality and amount of litter fall, increase decomposition rate and litter fall mineralization. Soil nitrification rate increased after forest conversion to coffee agro forestry can contaminate environment through leaching of NO3 -. Management of organic matter can decrease in the rate of soil nitrification after forest conversion to coffee agro forestry. This research was aimed measuring soil nitrification rate by addition of forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium) and monoculture of coffee litter fall. Hypothesis of this research is addition litter fall from monoculture of coffee yield rate nitrification compared to higher level of addition forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium) litter fall. This research conducted in May-June 2005 was used Inceptisol soil and litter fall of forest, coffee based agro forestry with mix shade trees and legumeshaded coffee (Gliricidia sepium) and monoculture of coffee from Bodong, Sumberjaya, Lampung Barat. Litter fall was collected by litter trap. This research was compiled in Complete Random Device (RAL) with aerobic incubation method during 8 week in laboratory by 5 treatment addition of forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium), monoculture of coffee litter fall and control (non litter fall addition). Every treatment conducted begins with 4 times and 6 measurements. This research use volume of polybag 250g and total of polybag are 120. Measurement conducted adding litter fall and soil has incubation during 2 week. Soil nitrification rate determined by comparing concentration of NH4 + and NO3 - after added of litter fall. Data analysis was used one-way ANOVA analysis with SPSS 13 program. Result of research show that (1) addition of litter fall has significant(p<0.01) to concentration of NH4 + and NO3 - and N-mineral of soil (2) addition of litter fall has significant (p<0.01) to NH4 +/NO3 - ratio (3) addition of coffee monoculture litter fall has yield concentration of NO3 - higher than forest and coffee based agro forestry with mix shade trees litter fall (4) addition of coffee monoculture litter fall has yield ratio of NH4 +/NO3 - lower (0.1mg kg-1) than addition of forest litter fall (1mg kg-1), coffee based agro forestry with mix shade trees litter fall (0.4mg kg-1) and legume-shaded coffee (Gliricidia sepium) litter fall (0.8mg kg-1). This result of research was indicated that adding litter fall like forest, coffee based agro forestry with mix shade trees and legume-shaded coffee (Gliricidia sepium) litter fall can depress soil nitrification rate until 96%.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/FP/2008/73/050800885 |
| Subjects: | 600 Technology (Applied sciences) > 630 Agriculture and related technologies |
| Divisions: | Fakultas Pertanian > Agroekoteknologi |
| Depositing User: | Unnamed user with email repository.ub@ub.ac.id |
| Date Deposited: | 31 Mar 2008 09:27 |
| Last Modified: | 08 Apr 2022 02:28 |
| URI: | http://repository.ub.ac.id/id/eprint/128063 |
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