Andy Wijanarko
Balai Penelitian Tanaman Aneka Kacang dan Umbi Jl. Raya Kendalpayak KM. 8 Malang, Jawa Timur

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PENGARUH KUALITAS BAHAN ORGANIK DAN KESUBURAN TANAH TERHADAP MINERALISASI NITROGEN DAN SERAPAN N OLEH TANAMAN UBIKAYU DI ULTISOL Wijanarko, Andy; Purwanto, Benito Heru; Shiddieq, Dja’far; Indradewa, Didik
Jurnal Perkebunan dan Lahan Tropika Vol 2, No 2 (2012): PERKEBUNAN DAN LAHAN TROPIKA
Publisher : Jurnal Perkebunan dan Lahan Tropika

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Abstract

Bahan organik tanah sangat berpengaruh terhadap kesuburan tanah dan produksi biomassa tanaman.  Kualitas bahan organik merupakan salah satu kunci dalam menjaga kelestarian tanah, tanaman dan lingkungan.  Penelitian ini bertujuan untuk mempelajari pengaruh kualitas bahan organik dan kesuburan tanah terhadap mineralisasi N. Untuk mengestimasi parameter mineralisasi N (potensial mineralisasi N (N0), laju mineralisasi (k), energi aktivasi (Ea) dan N0k) dilakukan percobaan inkubasi di laboratorium, menggunakan persamaan first order.  Sedangkan hubungan antara parameter mineralisasi dengan serapan hara N, dilakukan dengan melakukan percobaan pot di rumah kaca. Nilai N0, k dan Ea berturut-turut adalah 400 – 1156 mg kg-1, 0,0056 – 0,098 per minggu dan 10166 – 31478 J mol-1. Parameter mineralisasi N berkorelasi positif dengan N larut air, N-POM, Mikrobiomassa N, C-POM, Mikrobiomassa C, N-total dan nisbah C/N serta berkorelasi positif dengan berat kering tanaman, konsentrasi N dan serapan N tanaman ubikayu.  Bahan organik yang mempunyai nisbah C:N rendah dan tanah yang mempunyai tingkat kesuburan yang lebih tinggi mempunyai mineralisasi N yang lebih tinggi, yang ditunjukkan dengan nilai N0, k dan N0.k yang lebih tinggi dibandingkan dengan bahan organik dengan nisbah C:N tinggi dan kesuburan tanah yang rendah.   Kata kunci :  kualitas bahan organik, kesuburan tanah, mineralisasi N, serapan N
Penentuan Kebutuhan Pupuk P Untuk Tanaman Kedelai, Kacang Tanah Dan Kacang Hijau Berdasarkan Uji Tanah Di Lahan Kering Masam Ultisol Wijanarko, Andy; Taufiq, abdullah
Buletin Palawija No 15 (2008)
Publisher : Balai Penelitian Tanaman Kacang-kacangan dan Umbi-umbian

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Abstract

Ketersediaan P pada tanah masam umumnya rendah sehingga diperlukan pemupukan P. Pemupukan P yang didasarkan pada status kandungan P dalam tanah dapat meningkatkan efektivitas dan efisiensi pemupukan. Kebutuhan pupuk dapat diketahui melalui kalibrasi uji tanah. Kalibrasi uji tanah merupakan percobaan tentang tanggap tanaman terhadap pemupukan pada status hara tanah tertentu. Tingkat ketersediaan hara dalam tanah dinyatakan dalam tingkat rendah, sedang, dan tinggi, atau dalam suatu kisaran kandungan hara tertentu. Uji kalibrasi juga dapat dilakukan pada lokasi dengan status hara tanah bervariasi dari rendah sampai tinggi. Kandungan hara P dalam tanah dengan Bray I di lahan kering masam Ultisol termasuk pada kategori rendah untuk tanaman kedelai, kacang tanah, dan kacang hijau masing-masing adalah <5 ppm P2O5, <9 ppm P2O5, dan <7 ppm P2O5. Metode Bray I dan Bray II adalah metode yang baik untuk menduga tingkat ketersediaan P untuk kedelai, kacang tanah, dan kacang hijau pada tanah Ultisol.
Keunggulan Penggunaan Fosfat Alam pada Pertanaman Kedelai di Lahan Kering Masam Wijanarko, Andy
Buletin Iptek Tanaman Pangan Vol 10, No 2 (2015): Desember 2015
Publisher : Puslitbang Tanaman Pangan

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Abstract

Phosphorus is an essential nutrient required in large quantities by plants after Nitrogen. Rock phosphate is an alternative to improve the P availability in the soil, especially in acid soils. The use of rock phosphate in agriculture, should primarily be initiated by improving its reactivity due to its low reactivity. Characteristics of rock phosphate, chemical and physical properties of soil, and type of crops grown are greatly affecting the direct application rock phosphate in agriculture. The natural phosphate may be improved by the application of organic matter, use of strong acid or sulfur, application of phosphate solvent microorganisms, and increase use of high solubility fertilizer such as SP-36.
Karakteristik Sifat Kimia dan Fisika Tanah Alfisol di Jawa Timur dan Jawa Tengah Wijanarko, Andy; Sudaryono, Sudaryono; Sutarno, Sutarno
Buletin Iptek Tanaman Pangan Vol 2, No 2 (2007): September 2007
Publisher : Puslitbang Tanaman Pangan

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Abstract

Pemanfaatan tanah dalam jangka waktu yang lama tanpa teknik pengawetan, dapat menyebabkan penurunan kesuburan kimiawi dan fisik tanah, sehingga produktivitasnya rendah. Alfisol umumnya berada pada kondisi geografis dan agroklimat yang mendorong untuk menjadi tanah marjinal. Penelitian ini bertujuan untuk mengetahui karakteristik sifat kimia dan fisika tanah Alfisol di tujuh lokasi di Jawa Timur dan Jawa Tengah. Hasil penelitian menunjukkan bahwa pH tanah Alfisol yang diamati bereaksi dari masam hingga netral, dengan kandungan C- organik rendah, P-tersedia dari sangat rendah hingga sedang, K-dd dari rendah hingga tinggi, Ca-dd dari sedang hingga sangat tinggi, Mg-dd dari sedang hingga tinggi, KTK dari sedang hingga sangat tinggi dan unsur mikro (Fe dan Zn) yang tinggi. Warna tanah Alfisol yang diamati adalah coklat kemerahan hingga merah gelap, kekuatan tanah yang relatif rendah yaitu kurang dari 3,75 kg F/cm2, struktur tanah dari butir hingga tiang dan tekstur tanah dari lempung liat berpasir hingga liat.
Keunggulan Penggunaan Fosfat Alam pada Pertanaman Kedelai di Lahan Kering Masam Wijanarko, Andy
Buletin Iptek Tanaman Pangan Vol 10, No 2 (2015): Desember 2015
Publisher : Puslitbang Tanaman Pangan

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Abstract

Phosphorus is an essential nutrient required in large quantities by plants after Nitrogen. Rock phosphate is an alternative to improve the P availability in the soil, especially in acid soils. The use of rock phosphate in agriculture, should primarily be initiated by improving its reactivity due to its low reactivity. Characteristics of rock phosphate, chemical and physical properties of soil, and type of crops grown are greatly affecting the direct application rock phosphate in agriculture. The natural phosphate may be improved by the application of organic matter, use of strong acid or sulfur, application of phosphate solvent microorganisms, and increase use of high solubility fertilizer such as SP-36.
Effect of long of landuse and cropping system on soil fertility and cassava yield Wijanarko, Andy; Purwanto, Benito Heru
Journal of Degraded and Mining Lands Management Vol 5, No 4 (2018)
Publisher : University of Brawjiaya

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Abstract

A study that was aimed to determine the influence of long of land use and cropping systems on soil fertility and yield of cassava conducted at centre of cassava in Sukadana Subdistrict, East Lampung. Survey was conducted to characterize soil fertility due to the long of landuse and cassava cropping system from February to September 2014. Treatments of cropping system and long of land use observed involving: (1) Cassava monoculture for more than 30 years, (2) Cassava monoculture for 10- 30 years, (3) Cassava monoculture for less than 10 years, (4) Intercropping cassava and maize, (5) Intercropping cassava and groundnut, (6) Crop rotation of cassava and maize, and (7) Crop rotation of cassava and groundnut. The results showed that concentration of all macro nutrients of cassava monoculture for more than 30 years was lower than cassava monoculture for less than 10 years including the decrease of 11% of soil pH, 49% of total N , 66% of organic C, 57% of available P, 64% of K, 70% of Ca, 55% of Mg and 37% of CEC. Intercropping or crop rotation of cassava with legume or non-legume increased the soil pH, organic C, total N, K, Ca and Mg and decreased exchangeable Al. The changes in soil chemical and physical properties due to different cropping system affected the yield of cassava. The highest yield of cassava was obtained by crop rotation of cassava and maize, while the lowest was monoculture for more than 30 years. Cassava monoculture grown for 10-30 years or more than 30 years had low soil fertility so that the yield of cassava was also low. The yield of cassava in the rotation system was higher than the intercropping
Effect of land use and organic matter on nitrogen and carbon labile fractions in a Typic Hapludult Wijanarko, Andy; Purwanto, Benito Heru
Journal of Degraded and Mining Lands Management Vol 4, No 3 (2017)
Publisher : University of Brawjiaya

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Abstract

A study that was aimed to determine the effect of organic matter from groundnut and maize biomass on the availability of N and C labile fraction was conducted in laboratory and glasshouse, Iletry, Malang. Research used randomized block design with three replications. The first factor was land use : (1). Soil from land cultivated by cassava crops for less than 10 years, and (2). Soil from land cultivated by cassava crops for more than 30 years. The second factor was type of organic matter: (1). Groundnut biomass, (2). Maize biomass, (3). Groundnut-maize biomass, with a ratio of 1:1, (4). Groundnut – maize biomass, with a ratio of 2:1, (5). Groundnut – maize biomass, with a ratio of 1:2, and (6). Without organic matter. The results showed that application of groundnut and maize biomass were affect the N and C labile fraction. Application of groundnut + maize biomass increases N and C labile fraction more 40% than without biomass as well as the landuse of planted with cassava less than 10 years was 20 % higher N and C labile fractions than the land that has been planted with cassava more than 30 years. This research showed that analysis of N or C labile fraction is more sensitif than analysis of N total or C organic. It indicates that analysis of labile fractions can be used to analyze of N and C availability in the soil, beside of N total and C organic analysis
Effect of mulching and amelioration on growth and yield of groundnut on saline soil Taufiq, Abdullah; Wijanarko, Andy; Kristiono, Afandi
Journal of Degraded and Mining Lands Management Vol 4, No 4 (2017)
Publisher : University of Brawjiaya

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Abstract

Agricultural lands affected by salt facing complex problems associated with soil salinity and the toxicity effects of Na cation. Soil amelioration and mulching is an alternative to alleviate negative effect of salinity. Objective of research was to identify effective ameliorant, and effect of mulching in improving growth and yield of groundnut on saline soil. The research had been conducted on saline soil (soil EC 12 dS/m) in Lamongan during dry season of 2016, using Hypoma 2 cultivar. Treatments that consisted of two factors were arranged in a split plot design with three replicates. The main plot was mulching (without mulching and mulching with 3.5 t/ha of rice straw), and the sub plot was soil ameliorations (control, 120 kg/ha K2O, 750 kg/ha S, 5 t/ha gypsum, 5 t/ha manure, and 1.5 t/ha of gypsum + 5 t/ha manure). Results showed that mulching, and amelioration with 120 kg/ha K2O, 750 kg/ha S, 5 t/ha gypsum decreased soil EC, but could not improve groundnut growth and could not retard chlorophyll degradation because the soil was EC still high (12.5 dS/m). The higher yield (1.49 t/ha dry pods) can be obtained by amelioration with 750 kg sulphur/ha combined with mulching
Respons Pertumbuhan Vegetatif dan Generatif Varietas Kacang Tanah terhadap Pemberian Pupuk Organik di Dataran Tinggi Lahan Kering Iklim Kering Rahmianna, Agustina Asri; Wijanarko, Andy; Bombo, Yeremias
Buletin Palawija Vol 16, No 2 (2018): Buletin Palawija Vol 16 no 2, 2018
Publisher : Balai Penelitian Tanaman Aneka Kacang dan Umbi

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Abstract

Lahan kering iklim kering merupakan lahan potensial untuk berusahatani komoditas kacang tanah, mengingat bahwa Provinsi Nusa Tenggara Timur yang didominasi lahan kering dan iklim kering merupakan sentra keenam terbesar kacang tanah di Indonesia. Salah satu strategi untuk meningkatkan produksi kacang tanah jangka pendek adalah menanam varietas unggul berdaya hasil tinggi. Uji adaptasi suatu calon varietas selama ini dilakukan di sentra-sentra produksi yang terletak di dataran rendah di P. Jawa pada tipe iklim yang lebih basah. Oleh kerana itu, perlu dilakukan uji adaptasi varietas-varietas unggul di lahan kering iklim kering (LKIK). Penelitian dilaksanakan di LKIK tadah hujan di Desa Pambotan Jara, Kecamatan Waingapu yang terletak pada ketinggian 600 m dpl mulai April hingga Juni 2016. Rancangan strip plot dengan tiga ulangan digunakan pada penelitian ini. Faktor horizontal adalah enam varietas (Lokal Sandel, Kancil, Kelinci, Talam 1, Takar 1, dan takar 2), faktor vertikal adalah tiga dosis pupuk kandang (0, 2500, dan 5000 kg/ha). Pada makalah ini hanya dibahas keragaan pertumbuhan vegetatif dan generatif enam varietas tersebut. Hasil penelitian menunjukkan bahwa pertumbuhan vegetatif dan generatif varietas unggul Kancil, Kelinci, Talam 1, Takar 1 dan Takar 2 lebih bagus dari pertumbuhan varietas lokal Sandel di lahan kering tadah hujan pada ketinggian tempat 600 m dpl. Kelima varietas ini ternyata beradaptasi pada lokasi dengan ketinggian tempat 600 m, walaupun uji adaptasinya dilakukan di sentra produksi di dataran rendah. Di antara kelima varietas yang diuji, varietas Kancil, Kelinci, dan Talam 1 mempunyai lebih banyak keunggulan dibanding varietas Takar 1 dan Takar 2. Satu-satunya keunggulan varietas lokal Sandel adalah bobot per polong yang paling tinggi. 
Variability of Soybean [glycine max (L) Merr] Growth in Relation to Chemical Properties of Ultisol from East Lampung Taufiq, Abdullah; Wijanarko, Andy
Journal of Tropical Soils Vol 17, No 1: Januari 2012
Publisher : UNIVERSITY OF LAMPUNG

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Abstract

Acidic dry land in Lampung is potential for soybean development area. Low soybean yield in farmer level is one of factor causing its’ low competitiveness. Soil fertility is the main constrain related to low yield of soybean. Objective of the research was to diagnose a cause of poor soybean growth on dry land Ultisol at Sukadana sub District, East Lampung District. Soil and soybean plant samples were collected from farmers’ field at Sukadana ilir village during planting season April – July year 2010. Plant and soil samples were taken when soybean at R1 stage (starting to bloom) using stratified random sampling method. The result showed that variability of soybean growth on Ultisol at Sukadana, East Lampung related to variability of soil pH, exchangeable Al, exchangeable K, Ca, and Mg. The poor soybean growth was due to low soil pH, high exchangeable Al, low exchangeable K, Ca, and Mg.