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Dja’far Shiddieq

Unknown Affiliation

Author-ID : 2527343

Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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KLASIFIKASI KEMAMPUAN KESUBURAN TANAH (FCC) PADA BEBERAPA SUB DAS DI DAS SEMPOR KABUPATEN KEBUMEN JAWA TENGAH Roro Kesumaningwati; Dja’far Shiddieq; Bambang H Sunarminto
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 5, No 1 (2008)
Publisher : Faculty of Agriculture, Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v5i1.77

The fertility capability soil classification system (FCC) on several sub catchment areas, Sempor catchment area of Kebumen district Central Java. Sempor catchment area have many function, one of them is as a central of agricultural sector in Sempor sub district. The agricultural sector in Sempor catchment area hasn’t been able to catch up the optimal production. The production was only sufficient to supply farmer requirement. The research in order to agricultural development uncommon to do in Sempor catchment area. The research usually talking about the sedimentation process of Sempor basin whereas for the other problems weren’t gave much attention. Sempor catchment area has different characteristic on soil physic, chemical, and fertility. The research about the fertility capability soil classification system (FCC) on several sub catchment areas, Sempor catchment area need to be done in order to agricultural development. This research was used soil survey methods, and laboratory analysis. Result of this study shown that Sempor catchment area have different in soil fertility. Sampang sub catchment area has four FCC that is LR (≥45%), LCk (15‐30%), SC (30‐45%), and LC (8‐20%). Ketegan sub catchment area has three FCC that is LCk (15‐30%), SC (30‐45%), and LC (8‐ 20%). Kedungjati sub catchment area have four FCC that is LCk (15‐30%), SC (30‐45%), C (30‐45%), and LC (8‐20%). Kalikumbang, Kaliputih, Kedungwringin, and Sempor sub catchment area have two FCC that is LCk (15‐30%), and C (30‐45%), and Seliling sub catchment area have three FCC that is LCk (15‐30%), SC (30‐45%), and C (30‐45%). Key word : catchment area, the fertility capability soil classification system (FCC)

KAJIAN KONSERVASI TANAH KRITIS BERDASARKAN SATUAN LAHAN DI DAERAH TANGKAPAN AIR SEMPOR KABUPATEN KEBUMEN Dwi Priyo Ariyanto; Bambang Hendro Sunarminto; Dja’far Shiddieq
Sains Tanah - Jurnal Ilmu Tanah dan Agroklimatologi Vol 8, No 2 (2011)
Publisher : Faculty of Agriculture, Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15608/stjssa.v8i2.3

Title : Study of Critical Soil Conservation Based on Land Unit on Sempor’s Catchment Area, Kebumen Regency. This research aims to predict critical soil and soil erosion level of Sempor’s Catchment Area and to recommend the management according to soil conservation.This is an explorative descriptive research based on environment data. The data are obtained from field observation and result of laboratory analysis of soil samples taken from field survey. Furthermore, the data are classified based on critical soil classification to get critical soil map. The data also are calculated based on USLE to get soil erosion prediction. The results of soil erosion prediction are grouped based on erosion hazard levels and result of soil erosion mapping. After knowing critical soil and soil erosion level in each land unit, recommendation is made to manage land according to soil conservation.The result shows that on observation area with total extent 4,333.68 ha there are criticalsoil about 1,373.68 ha (31.70 %), semi critical about 2,164.54 ha (49.95 %), potentially critical about 440.46 ha (10.16 %) and the others are about 355.00 ha (8.19 %) in the form of settlement and reservoir located at the outside of the observation area. The soil erosion predicted on observation area are divided into 6 classes, those are very low erosion class at about 103.90 ha (2.40 %), low erosion class at about 332.00 ha (7.66 %), moderate erosion class at about 953.78 ha (22.01 %), high erosion class at about 247.53 ha (5.71 %), very high erosion class at about 2,108.50 ha (48.65 %), acute erosion class at about 232.96 ha (5.38 %) and the others are out of observation area. Topography and land management are factors that have the most dominant influence to soil erosion prediction. Total soil erosion on observation area is about 320,958.016 tons/ha or soil erosion average about 74.061 tons/ha/year. The recommendation is to restore critical and erosion through some actions such as reboization or planting with annual crop, vegetation nursery, adding organic matter via organic fertilizer or organic mulches, making and maintaining of terrace and ditches, and agroforestry.Keywords: critical soil, erosion, Sempor, soil coservation

PEMANFAATAN BAHAN ALAMI SEBAGAI PENGHAMBAT NITRIFIKASI UNTUK MENINGKATKAN EFISIENSI PEMUPUKAN NITROGEN PADI SAWAH Joko Pramono; Djoko Prajitno; Tohari Tohari; Dja’far Shiddieq
Agrin Vol 15, No 2 (2011): Agrin
Publisher : Jenderal Soedirman University

Pemupukan merupakan upaya untuk meningkatkan ketersediaan hara dalam tanah guna menunjangpertumbuhan tanaman yang optimal. Sistem usahatani padi sawah intensif di Indonesia, sejak era revolusi hijauhingga sekarang tidak terlepas dari peran pupuk kimia yang bernama urea. Penelitian bertujuan untukmengetahui pengaruh pemberian bahan penghambat nitrifikasi alami terhadap pertumbuhan, hasil dan efisiensipemupukan N pada tanaman padi. Penelitian rumah kaca untuk mengetahui efektivitas pengunaan pupuk N +nitrat inhibitor (NI) alami dilakukan di rumah kaca Fakultas Pertanian Universitas Gadjah Mada. Rancanganyang digunakan adalah Acak Lengkap dengan perlakuan sebagai berikut; N0 = tanpa urea tanpa NI (kontrol);N1 = urea tanpa NI; N2 = urea + NI dari bubuk kulit bakau pada dosis 20 % dari urea; N3 = urea + NI daribubuk kulit bakau pada dosis 30 % dari urea; N4 = urea + NI dari bubuk biji mimba pada dosis 20 % dari urea,dan N5 = urea + NI dari bubuk biji mimba pada dosis 30 % dari urea, diulang sebanyak 4 kali. Hasil penelitianmenunjukkan bahwa (1) Perlakuan NI rata-rata mampu mempertahankan nilai kandungan klorofil pada daunpadi pada umur 60 hst berada diatas batas kritis, (2) Perlakuan terbaik adalah bahan NI yang berasal dari serbukbiji Nimba dengan takaran 20 % dari dosis urea yang diberikan, yang memberikan kenaikan hasil sebesar 9,6 %,dan (3) Penggunaan pupuk urea + serbuk biji Nimba 20 % lebih efektif dengan nilai efektivitas (RAE) sebesar34 % dan efisiensi agronomi (AE) sebesar 50 g g-1 dan lebih tinggi dibandingkan perlakuan yang lain.Kata kunci : Nitrat inhibitor, efisiensi pemupukan N, bahan alam ABSTRACTFertilization is an effort to improve nutrient availability in the soil to support optimal plant growth.Intensive rice farming systems in Indonesia, since the green revolution era to the present is inseparable from therole of chemical fertilizer called urea. The study aims to determine the effect of giving the material a naturalnitrification inhibitor on growth, yield and N fertilizer efficiency in rice plants. Greenhouse studies to determinethe effectiveness of the use of N fertilizer + nitrate inhibitors (NI) carried out in greenhouse Faculty ofAgriculture, Gadjah Mada University. The design used was Randomized Complete with treatments as follows:N0 = no urea without NI (control); N1 = urea without NI: N2 = urea + NI of mangrove skin powder at doses of20% of urea; N3 = urea + NI from mangrove skin powder at doses of 30% of urea; N4 = urea + NI of neemseed powder at doses of 20% of urea, and N5 = urea + NI of neem seed powder at doses of 30% of urea,repeated 4 times. Results showed that (1) NI treatment on average is able to maintain the value of the content ofchlorophyll in the leaves of rice at the age of 60 DAT is above the critical limit, (2) The best treatment is a NIfrom Neem seed powderwith a dose of 20% of the dose of urea, which gives rise to a yield of 9.6%, and (3)Theuse of urea + 20% Neem seed powder is more effective with the effectiveness (RAE) by 34% and agronomicefficiency (AE) of 50 g g-1 and higher than the other treatments.Key words: Nitric inhibitor, N fertilization efficiency, natural materials

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