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All Journal Vegetalika Jurnal Ilmu Pertanian agriTECH Planta Tropika Informatika Pertanian jurnal Ilmu Pertanian (Agricultural Science) Aspirasi: Jurnal Ilmiah Administrasi Negara

Djoko Prajitno

Departemen Budidaya Pertanian, Fakultas Pertanian, Universitas Gadjah Mada

Author-ID : 2898521

Agriculture, Biological Sciences & Forestry Computer Science & IT Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences

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The Study on The Seed Storability of Black Soybean (Glycine max L. Merrill) Intercropped with Sweet Sorghum (Sorghum bicolor L. Moench) Purwanti, Setyastuti; Immawati, Dhika Rizky; Prajitno, Djoko
PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) Vol 6, No 2 (2018)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.2018.088.116-121

The experiment was aimed to know how to maintain seed quality during storage by planting black soybean and sweet sorghum in row using an intercropping system. This experiment was conducted in the Laboratory of Seed Technology, Faculty of Agriculture, Gadjah Mada University, Yogyakarta, Indonesia, from November 2013 until April 2014. This experiment was single factor experiment arranged in CRD (Completely Randomized Design) with four treatments and four replications. The treatments consisted of monoculture of black soybean, intercropping between black soybean and sweet sorghum with various row ratios, i.e. 3:1, 4:1, and 6:1. The seeds were stored as many as 250 g for each treatment in hermetic plastic at normal temperature (27-28 ºC) for five months. Seed quality testing was performed every month. Data collected included moisture content, germination, vigor index and vigor hypotetical of the seeds. The result of this experiment showed that the quality of black soybean seeds yielded from intercropping with sweet sorghum gave the same effect compared to the black soy bean seeds yielded from monoculture. Seed quality of black soybean planted in intercropping and monoculture system could be well maintained until the fourth months of storage.

ANALISIS GGE BIPLOT PADA HASIL KLON-KLON UBI KAYU MENGGUNAKAN METODE RESTRICTED MAXIMUM LIKELIHOOD Noerwijati, Kartika; Nasrullah, nFn; Taryono, nFn; Prajitno, Djoko
Informatika Pertanian Vol 25, No 1 (2016): JUNI 2016
Publisher : Sekretariat Badan Penelitian dan Pengembangan Pertanian

The study was conducted in five locations i.e Kediri, Ponorogo, Probolinggo, Malang, and Mojokerto, from November 2010 until August 2011. The planting materials used were 15 cassava clones. The research objective was to compare analysis methods of the genotype Ã— environment interaction, namely: a) GGE technique using REML without A matrix by assuming homogeneous residual error variance, b) GGE technique using REML with A matrix by assuming homogeneous residual error variance, c) GGE technique using REML without A matrix by assuming heterogeneous residual error variance, and d) GGE technique using REML with A matrix by assuming heterogeneous residual error variance. The results showed that GGE technique using REML without A matrix by assuming heterogeneous residual error variance was more appropriate. Clones CMM 03038-7 (G8) had a wide adaptability and high yield potential, and its clone was closest to the ideal criteria for genotype compared with other genotypes. Clones CMM 03094-4 (G10) had specific adaptability in the environments S2 (Malang) and S5 (Mojokerto), and it had higher yield potential than the control varieties UJ5, Malang 6, and Adira 4. Environment Kediri (S1) had the highest yield among other environments and Kediri was a suitable environment for the growth and selection of cassava.Â

Mitigasi Pelindian Nitrat pada Tanah Inceptisol melalui Pemanfaatan Bahan Nitrat Inhibitor Alami Joko Pramono; Djoko Prajitno; Tohari Tohari; Dja'far Shiddieq
agriTECH Vol 32, No 2 (2012)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

NO3 - leaching is one mechanism of N reduction in agricultural activity, which may contribute to environmental pollution. The purpose of this research is to investigate the use of natural products as nitrate inhibitors toward nitrate leaching in Inceptisol soil. In this study, three types of natural nitrate inhibitors (NI) derived from neem seed powder (NSP), mangrove bark powder (MBP), and coffee leaf powder (CLP) were tested combined with the three doses of NI, i.e. 20 %, 30 %, and 40 % of urea used were given. Moreover, a treatment without NI was used as a control. Material was supplied with urea nitrate inhibitor on the surface of the soil in the pot experiment that had been moistened with distilled water. Results showed that the nitrate inhibitors materials had different response to different nitrifi cation inhibition. Nitrate inhibitors material derived from neem seed powder (NSP) had the highest inhibition rate of 25.6 %, while mangrove bark powder (MBP) and coffee leaf powder (CLP) had the rate of 9.1 % and 11.8 %, respectively. NI ingredients naturally capable of inhibiting nitrifi cation through the inhibition of nitrifi er growth (ammonium oxidizing) which was temporary in the range of 7-14 days after NI materials application. Treatment of different materials and NI doses suppressed the leaching of nitrate from 56.6 % to 62.8 % during 14 day after application. Treatment using different materials had signifi cant effect compare to the control treatment without NI. Optimal dose of two selected NI materials showed the best performance of nitrifi cation inhibition (NSP and MBP), i.e. 18.3% (R2 = 0.69) and 21.67% (R2 = 0.69) from a given dose of urea, respectively, 7 day after application.ABSTRAKPelindian NO3- merupakan salah satu mekanisme kehilangan N dalam aktivitas pertanian, yang dapat berdampak terhadap pencemaran lingkungan. Tujuan dari penelitian adalah untuk mengetahui penggunaan bahan alami sebagai nitrat inhibitor terhadap pelindian nitrat pada tanah Inceptisol. Pada penelitian ini diuji tiga jenis bahan nitrat inhibitor (NI) alami yang berasal dari; serbuk biji Mimba (SBM), serbuk kulit kayu bakau (SKKB), dan serbuk daun kopi (SDK),yang dikombinasikan dengan tiga taraf dosis NI, yaitu: 20 %, 30 % dan 40 % dari urea yang diberikan, dan ditambah satu perlakuan kontrol tanpa NI. Bahan nitrat inhibitor diberikan bersama urea pada permukaan tanah dalam pot percobaan yang telah dibasahi dengan air suling. Hasil penelitian menunjukkan bahwa bahan NI yang berbeda memberikan respon terhadap penghambatan nitrifi kasi yang berbeda. Bahan NI yang berasal dari serbuk biji mimba memberikan tingkat penghambatan tertinggi sebesar (25,6 %), serbuk kulit kayu bakau sebesar (19,1 %), dan serbuk daun kopi sebesar 11,8 %. Bahan NI alami mampu menghambat nitrifi kasi melalui penghambatan pertumbuhan bakteri nitrifi kasi (pengoksida ammonium) yang bersifat sementara pada kisaran 7-14 hari setelah aplikasi. Perlakuan berbagai bahan dan dosis NI mampu menekan pelindian nitrat rata-rata pada kisaran antara 56,6 sampai 62,8 % dan berbeda sangat nyata terhadap perlakuan kontrol tanpa NI. Bahan NI yang mampu menurunkan rata-rata pelindian nitrat pada pengamatan 14 hari setelah aplikasi tertinggi adalah SBM sebesar 74,15 %. Dosis optimal dua bahan NI terpilih yang menunjukkan kinerja penghambatan nitrifi kasi terbaik (SBM dan SKKB) pada 7 hsa, masing-masing 18,30 % (R2 = 0,694) dan 21,67 % (R2=0.691) dari dosis urea yang diberikan.

PENGARUH JARAK TANAM DAN TAKARAN PUPUK NPK TERHADAP PERTUMBUHAN DAN HASIL BENIH KACANG HIJAU (Vigna radiata L. Wilczek) Tri Marsiwi; Setyastuti Purwanti; Djoko Prajitno
Vegetalika Vol 4, No 2 (2015)
Publisher : Universitas Gadjah Mada

Penelitian ini bertujuan untuk 1) mengetahui pengaruh jarak tanam terhadap pertumbuhan dan hasil benih kacang hijau 2) mengetahui pengaruh takaran pupuk NPK terhadap pertumbuhan dan hasil benih kacang hijau serta 3) mengetahui interaksi antara jarak tanam dan takaran pupuk terhadap pertumbuhan dan hasil benih kacang hijau. Penelitian di lahan petani Karangasem, Palbapang, Bantul, Yogyakarta pada bulan Mei-Agustus 2012. Sedangkan pengujian kualitas benih di lakukan dilaboratorium Teknologi Benih, Fakultas Pertanian UGM. Percobaan menggunakan rancangan petak terbagi dengan menggunakan tiga ulangan. Petak utama adalah jarak tanam terdiri atas J0= 15 cm x 30 cm (populasi 216.667 tanaman/ha), J1= 30 cm x 30 cm (populasi 108.300 tanaman/ha), J2= 20 cm x 40 cm (populasi 125.000 tanaman/ha), sedangkan anak petak adalah takaran pupuk, terdiri atas P0= 0 kg Urea, 0 kg SP36, 0 kg KCl, P1= 50 kg Urea, 50 kg SP36, 50 kg KC1, P2= 75 kg Urea, 75 kg SP36, 75 kg KCl. Hasil penelitian menunjukkan bahwa tidak terjadi interaksi yang nyata antara parameter jarak tanam dengan parameter takaran pupuk NPK. Jarak tanam mampu memberikan hasil yang sama dengan hasil tertinggi pada jarak 15 cm x 30 cm sebesar 0,85 ton/ha. Takaran pupuk NPK 75 kg/ha mampu memberikan hasil sebesar 0,84 ton/ha.

CIE L*a*b* Color Space Based Vegetation Indices Derived from Unmanned Aerial Vehicle Captured Images for Chlorophyll and Nitrogen Content Estimation of Tea (Camellia sinensis L. Kuntze) Leaves Wahono Wahono; Didik Indradewa; Bambang Hendro Sunarminto; Eko Haryono; Djoko Prajitno
Jurnal Ilmu Pertanian Vol 4, No 1 (2019): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

A lot of digital image techniques to assess crop agronomic character have been developed. Most of those techniques are based on non-visible light equiped cameras, such as infared wavelengths. This research was aimed to examine the use of commercial digital camera with sensor range in visible light spectrum using CIE L*a*b* color space to estimate chlorophyll and nitrogen content of tea leaf. Data was collected from an experiment of nitrogen dossage levels on 3 years after prunning tea crops. The result shows that Lb* Difference Simple Index (LI), a*b* Difference Simple Index (AI), and a* Vegetation Index (VIA) can be used to estimate tea leaf chlorophyll and nitrogen content. The relationship between VIA and tea leaf nitrogen content was defined on linear equation y = 1.8382x2 - 0.3099x + 3.0658 with determinant coefficient R² = 0.71.

A Proposed Crop Yield Model Djoko Prajitno
Jurnal Ilmu Pertanian Vol 3, No 7 (1984): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.58716

Optimasi Produksi Tanaman Untuk Petani Djoko Prajitno
Jurnal Ilmu Pertanian Vol 3, No 2 (1981): Agustus
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.58738

Suatu Konsep Tentang Stabilitas Serta Kemungkinan Penerapannya Dalam Analisa Sistem Pertanian Djoko Prajitno
Jurnal Ilmu Pertanian Vol 3, No 4 (1981): Desember
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.59426

Karakter Fisiologis Padi Sawah Efisien dan Tanggapan Fosfor (P) Di Tanah Podsolik Merah Kuning Karno Karno; Didik Indradewa; Dja'far Shiddieq; Djoko Prajitno
Jurnal Ilmu Pertanian Vol 14, No 2 (2007): Desember
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.59443

The Effect of Genotype X Environment Interaction on the Estimate of Genetic Variances. A Computer Simulation Study Djoko Prajitno
Jurnal Ilmu Pertanian Vol 2, No 6 (1979): Mei
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.59760

Co-Authors A. Widiyatmoko Abdurahman . Aziz Purwantoro Bambang Hendro Sunarminto Ch. Atik Setyowati Didik Indradewa Didik Indradewa Dja'far Shiddieq Dja'far Shiddieq Eko Haryono Harkingto Harkingto Immawati, Dhika Rizky Joko Pramono Karno Karno KHOIRUL ANAM Mohammad Fahrur Rozi Mujib Mujib, Mujib Nasrullah, nFn Noerwijati, Kartika Pratama, Arga Rini Aristin, Rini Setyastuti Purwanti Setyastuti Purwanti, Setyastuti Sulistiorini Sulistiorini Suroso, Rahmad Kurniadi Taryono, nFn Tohari Tohari Tri Marsiwi Wahono Wahono

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