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Analisis Cluster Sebaran Hara Makro dan Rekomendasi Pemupukan untuk Tanaman Tebu (Saccharum officinarum Linn.) Basuki, Basuki; Purwanto, Benito Heru; Sunarmito, Bambang Hendro; Hidayah Utami, Sri Nuryani
Jurnal Ilmu Pertanian Vol 18, No 3 (2015)
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.096 KB) | DOI: 10.22146/ipas.10614

Abstract

Industri gula Indonesia berada di bawah tekanan untuk meminimalkan kehilangan nutrisi off-farm dan mengurangi seluruh biaya produksi. Saprodi pupuk menyerap biaya produksi 65% dari total biaya. Salah satu upaya yang dapat dilakukan adalah penerapan rekomendasi pupuk spesifik berdasarkan analisis tanah. Penelitian ini bertujuan untuk mengelompokkan petak Status Hara N Total, P-Tersedia, K-Tertukar dan cluster rekomendasi pemupukan tanaman tebu (Saccharum officinarum Linn.) di kebun Unit Usaha PG. Djatiroto, Lumajang melalui pemetaan. Analisis dilakukan terhadap 48 sampel, dengan 1 sampel mewakili petak 6,25 ha. Pengelompokan petak berdasarkan peubah konsentrasi N Total, P-Tersedia, K-Tertukar dilakukan dengan metode Hierarchical cluster Analysis dan Sistem Informasi Geografis (GIS) mulai dari bulan Januari sampai Mei 2014. Hasil analisis mendapatkan 5 kelompok area rekomendasi pemupukan. Satu kelompok (cluster 3) yang terdiri dari satu petak dengan rekomendasi 160 kg N/ha, 90 kg P2O5/ha,145 kg K2O/ha; cluster 1 yang terdiri dari 29 petak dengan rekomendasi 160 kg N/ha, 90 kg P2O5/ha, 175 kg K2O/ha; cluster 2 yang terdiri dari 7 petak dengan rekomendasi 120 kg N/ha, 90 kg P2O5/ha, 175 kg K2O/ha, cluster 4 yang terdiri dari 23 petak dengan rekomendasi 160 kg N/ha, 135 kg P2O5/ha, 175 kg K2O/ha; cluster 5 yang terdiri dari 6 petak dengan rekomendasi 120 kg N/ha, 135 kg P2O5/ha, 175 kg K2O/ha.
THE LEACHING OF IRON AND LOSS OF PHOSPHATE IN ACID SULPHATE SOIL DUE TO RICE STRAW AND PHOSPHATE FERTILIZER APPLICATION Fahmi, Arifin; Radjagukguk, Bostang; Purwanto, Benito Heru
Journal of Tropical Soils Vol 17, No 1: Januari 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i1.%p

Abstract

Low phosphorus (P) availability and high iron (Fe) concentration are the dominant characteristics of acid sulphate soils (ASS).  Optimum agricultural management practices are required to leach the excess Fe2+  and to prevent or minimize loss of P from the soil in order to obtain conditions favorable for rice growth. The aim of this experiment was to study the effect of organic matter (OM) application in the form of rice straw (RS) on leaching of Fe and loss of P in an acid sulphate soil. The experiment was conducted in the glasshouse consisting of three treatment factors utilizing the completely randomized design with three replications. The first factor was soil condition consisting of continuous application of RS and without RS during the past five years. The second factor was application of fresh RS consisting of fresh RS application and without fresh RS application, whereas the third factor was P application consisting of three rates of SP-36 fertilizer (0.5, 1.0 and 1.5 times of the recommended rate). The results showed that RS application was effective in preventing P loss from the soil at 6 weeks after planting (WAP) and decreased the pH of leachate at all observations time but it increased Fe2+ concentration in leachate (0.07-0.42% Fe2+ in the soil were leached or 2-5 folds higher than without RS application).
EFFECTS OF AMELIORANT COMPOSITIONS ON NITROGEN MINERALIZATION AND UPTAKE BY SWEET CORN IN DEGRADED PEATLAND Maftu’ah, Eni; Purwanto, Benito Heru
Indonesian Journal of Agricultural Science Vol 15, No 1 (2014): April 2014
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Peat soil is characterized by poor nitrogen (N) availability. Ameliorants are expected to rectify this problem. This research  aimed to study the effect of ameliorant on N availability and N uptake by sweet corn plant in degraded peatland. The experiment was conducted in the greenhouse in May-July 2011 and on peatland of Kalampangan Village, Palangkaraya, Central Kalimantan in September-December 2011. Burnt peat soil of Kalampangan was used in the greenhouse experiment and sweet corn was used as an indicator plant. The treatments consisted of two factors, i.e. compositions of ameliorants by weight (A1 = 80% chicken manure + 20% dolomite; A2 = 80% local farm weed + 20% dolomite; A3 = 80% mineral soil + 20% dolomite; A4 = 20% chicken manure + 20% local farm weed + 20% residue of Chinese water chestnut (Eleocharis dulcis) + 20% mineral soil + 20% dolomite; and A5 = 19% chicken manure + 71.5% mineral soil + 9.5% dolomite) and rates of those ameliorants (5, 10, 15, 20 and 25 t ha-1). The experiment was arranged in a completely randomized block design with three replications. Data were collected every two weeks for five times. Observations were made on soil pH, available N (NH4+, NO3-), plant height, and N uptake in root and shoot. The results showed that  treatment A1 increased soil pH and availability of NH4+ and NO3-  in peat soils at the maximum vegetative stage. Treatment A1 provided the highest N availability and N uptake by the plant. Field experiment showed that N uptake increased  with the plant yield. Optimum yield of fresh corn cob was obtained from treatment A1 at the rate of 20 t ha-1. This research reconfirms the effectiveness of chicken manure and dolomite as peat soil ameliorant.
PERAN MIKROBA STARTER DALAM DEKOMPOSISI KOTORAN TERNAK DAN PERBAIKAN KUALITAS PUPUK KANDANG Agus, Cahyono; Faridah, Eny; Wulandari, Dewi; Purwanto, Benito Heru
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 21, No 2 (2014)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1.84 KB)

Abstract

Pupuk organik perlu didekomposisi oleh mikroba dan memerlukan lingkungan yang sesuai agar cepat matang sempurna dan tidak memberikan dampak negatif pada aspek sosial, estetika maupun kesehatan pada makluk hidup dan lingkungan. Dekomposisi bahan pupuk organik dilakukan dengan menggunakan kotoran sapi, dengan 2 perlakuan mikroba (tanpa dan dengan mikroba starter) dan 3 variasi waktu, yaitu 0, 6 dan 24 jam setelah diberi mikroba starter. Analisis meliputi  uji fisik bahan pupuk yang meliputi pH, warna, aroma, lengas, dan DHL,  uji mikroba patogen (Eschericia. coli dan Salmonella) pada pupuk, pengujian kandungan hara pupuk total (C, N, P, K, Ca, Mg, Na, S, Cd, Cr, B, Fe, Cu, Zn)  dan Ntersedia (NH4 dan NO3),  serta analisis emisi gas amonia (NH3), oksigen (O2), karbon monoksida (CO), karbon dioksida (CO2), metana (CH4), NOx, NO, dan SO2. Mikroba starter mengandung mikrobia dan unsur hara yang sangat diperlukan dalam proses dekomposisi bahan organik. Pupuk kandang sapi setelah aplikasi  mikroba starter masih mengandung E. coli dan Salmonella sp. yang cenderung menurun seiring dengan lama waktu inkubasi. Terjadi dinamika kandungan unsur-unsur hara seperti P, K, Mg, Fe dan Cu serta logam berat Cr selama proses inkubasi baik pada pupuk kandang ayam maupun sapi. Dengan perlakuan mikroba starter, bagian senyawa sulfur dari bahan organik banyak yang terombak menjadi gas SO2 yang relatif tidak berbau, dan sebaliknya H2S serta senyawa reduktif sulfida lainnya menjadi terhambat pembentukannya. Perombakan dengan  mikroba starter sebaiknya diupayakan dalam suasana aerobik atau dengan suasana lembab tetapi tidak sampai anaerobik sehingga kehadiran senyawa H2S dan senyawa sulfur reduktif lainnya dapat dikurangi atau tidak terbentuk. Hasil penelitian ini menunjukkkan pentingnya penggunaan mikroba starter optimal dan benar untuk memperbaiki kandungan nutrisi dan kualitas pupuk kandang.
PENGARUH KUALITAS BAHAN ORGANIK DAN KESUBURAN TANAH TERHADAP MINERALISASI NITROGEN DAN SERAPAN N OLEH TANAMAN UBIKAYU DI ULTISOL Wijanarko, Andy; Purwanto, Benito Heru; Indradewa, Didik
Perkebunan dan Lahan Tropika Vol 2, No 2 (2012): PERKEBUNAN DAN LAHAN TROPIKA
Publisher : Fakultas Pertanian Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/plt.v2i2.3484

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
SHALLOT GROWTH AND YIELDS BASED ON AMMONIUM:NITRATE RATIO ON COASTAL SANDY SOIL Safitri, Wiji; Sulistyaningsih, Endang; Purwanto, Benito Heru; Harper, Stephen
Jurnal Ilmu Pertanian Vol 2, No 2 (2017): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2544.368 KB) | DOI: 10.22146/ipas.18333

Abstract

Nitrogen was a key component for increasing yield and quality of vegetables like shallots. The growth and development of plants were influenced by nitrogen form. Common plants preferred nitrate for growth, but the enormity preference varies within plant species and other environmental factors. The purpose of this experiment was to study the effect of ammonium:nitrate ratio in sandy soil to growth and yield of shallot (Allium cepa L. Aggregatum group). The experiment had been conducted in August-October 2015 in the sandy land on Samas Beach, Bantul, Yogyakarta, Indonesia. The research was arranged in a Split-Plot design. The main plot was the source of nitrogen (NH4+; NO3-; NH4+: NO3- 1:1; NH4+: NO3- 1:2; and NH4+: NO3- 2:1) and the subplot was cultivars (Crok Kuning, Tiron, and Bima Brebes). Each subplot covered an area of 2.5 m² (2.5 m x 1 m) with three blocks as replications. Shallot bulbs were planted in sixth-row, spacing 20 cm between rows and 15 cm within rows. The dose was applied according to the recommendation of BPTP (urea 200 kg ha-1, ZA 250 kg ha-1, SP-36 150 kg ha-1, and KCl 150 kg ha-1) 144.5 kg N ha-1. Ammonium:nitrate ratio influenced shallot growth in sandy soil through number of leaves at maximum vegetative phase and its leaf area. The NH4+: NO3- 1:2 ratio gave the best result in dry weight of leaves following bulb dry weight than other ratio. Nevertheless, ammonium:nitrate ratio had no significant influence on bulb dry weight (ton ha-1).
Application of Lime and Gypsum and Their Effect on Micronutrients (Fe, Zn, Mn, and Cu) Uptake of Sugarcane Planted in Central Lampung Ultisols Widiarso, Christoporus Sudradjat; Purwanto, Benito Heru; Hanudin, Eko; Ma’as, Azwar
Jurnal Ilmu Pertanian Vol 2, No 2 (2017): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1519.079 KB) | DOI: 10.22146/ipas.25805

Abstract

Most of sugarcane are cultivated on Ultisols with low inherent soil fertility in Central Lampung. This experiment aimed to observe the effect of lime (CaCO3) and gypsum (Ca2SO4) on Fe, Zn, Mn, and Cu uptake of sugarcane. The experiment was conducted in Experimental Research Field of Gula Putih Mataram Enterprise, Central Lampung District. The experiment was designed using a split-plot, which consisted of lime application as the main plot and gypsum application as the sub plotwith three replications. The results showed that there were no significant influence of lime and gypsum application on micronutrient content of the soil. However, application of 2 and 3 tons of lime/ha could reduce soil Fe content about 349.86 and 328.07 ppm respectively within 0-20 cm soil in depthand it was significantly lower than comparing to Fe content (around 457.68 ppm) in control. Similarly, the effect of gypsum application at 0.25 ton.ha-1 decreased Fe content (355.42 ppm), while Fe content of non-gypsum application soil showed around 410.34 ppm. The analysis of other micronutrients did not indicate asignificant effect of lime or gypsum application.
EFFECT OF SALTED FISH WASTE AND COW MANURE ON THE NPK AVAILABILITY AND UPTAKE OF LOWLAND RICE ON PEAT SOIL IN PELALAWAN, RIAU Ompusunggu, Dian Syafitri; Purwanto, Benito Heru; Wulandari, Cahyo; Utami, Sri Nuryani Hidayah
Jurnal Ilmu Pertanian Vol 5, No 1 (2020): April (On Progress)
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.47281

Abstract

The low rice yield on thick peat can be overcome if the rice plants are provided with complete nutrients. Various efforts have been done to increase the productivity of Indonesian peatlands, one of which is by adding salted fish waste and cow manure. This research was carried out on a plastic house scale from October 2017 to January 15, 2018 in Pelalawan District, Pelalawan Regency, Riau. This research was conducted using a Completely Randomized Design (CRD), which were L0 = Control, L1 = 1.5 ton.ha-1 of fish waste, L2 = 2.25 ton.ha-1 of fish waste, L3 = 7 tons/ha of cow manure, L4 = 15 ton.ha-1 of cow manure, L5 = 1.5 ton.ha-1 of fish waste + 7 ton.ha-1 of cow manure, L6 = 1.5 ton.ha-1 of fish waste + 15 ton.ha-1 of cow manure, L7 = 2. 25 ton.ha-1 of fish waste + 7 ton.ha-1 of cow manure, L8 = 2.25 ton.ha-1 of fish waste + 15 ton.ha-1 of cow manure. The results showed that the application of cow manure and salted fish waste could increase soil pH, total NPK dan NPK uptake. The best results are soil pH, total NPK dan NPK uptake obtained from the treatment of 2.25 tons/ha of fish waste and 15 tons/ha of cow manure, so the cultivation of lowland rice on peat soil is recommended.
THE EFFECT OF HUMIC ACID TO PLANT GROWTH, AND YIELD OF TWO CULTIVAR MAIZE (ZEA MAYS L.) ON ANDISOL SOIL Prakoso, Tangguh; Sulistyaningsih, Endang; Purwanto, Benito Heru
Jurnal Ilmu Pertanian Vol 5, No 1 (2020): April (On Progress)
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (43.008 KB) | DOI: 10.22146/ipas.36935

Abstract

To increase corn production (Zea mays L.) is the extension of land using Andisol land. Andisol soil has a fixation problem of phosphate element (P) because of the high amorphous material. Humic acid which has greater affinity to amorphous minerals, is one way to increase the unavailability of soil P element. This research was conducted on February-May 2017 at Tri Dharma field of Faculty of Gadjah Mada University. Andisol land used is a has a low P available from Datar and Wonosobo, Central Java. This research uses a polybag scale, using a Randomized Complete Randomized Block Design (RCRBD) of 2 factors. The first factor is maize cultivar (Bisi-2 and Pioneer-35). The second factor is the doses of humic acid include without fertilization (control), NPK fertilization, fertilizer + humic acid 5%, 10%, and 15%. Percentage of humic acid based on the amount of NPK 16:16:16 fertilizer given is 350 kg ha-1. Fertilization was applied 3 times 100 kg ha-1 on 1 MST, 150 kg ha-1 at 3 MST and 100 kg ha-1 at 7 MST. The results, humic acid treatment had the same effect with NPK fertilization treatment only and control on P available Andisol soil. Humic acid, also has the same effect with NPK fertilizer treatment in increasing the yield component of 100 seeds weight, dry weight of seeds, harvest index, length of cobs and productivity. Meanwhile, the use of humic acid and NPK fertilization, had a effect in increasing the growth of both corn cultivars compared to the controls.
GROWTH AND YIELD RESPONSE OF MAIZE (ZEA MAYS L.) ON ACID SOIL TO DIFFERENT RATES OF HUMIC ACID AND NPK FERTILIZER Wulandari, Putri; Sulistyaningsih, Endang; Handayani, Suci; Purwanto, Benito Heru
Jurnal Ilmu Pertanian Vol 4, No 2 (2019): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (268.804 KB) | DOI: 10.22146/ipas.36680

Abstract

The main constraint in the extensification of maize on the dry land of acid soil is the low availability of P in soil. This study aimed to determine the effect and the optimal dose of humic acid on the growth and yield of maize on acid soil. This research was conducted from February to May 2017 at Tri Dharma Field Laboratory, Faculty of Agriculture, Gadjah Mada University. Acid soil with low P availability used was from sub-district Cigudeg and Jasinga, West Java. The research was arranged in Randomized Complete Block Design (RCBD) with 2 factors. The first factor was maize cultivar, namely Bisi 2 and Pioneer 35. The second factor was the rate of humic acid and NPK fertilizer, consisting of 0 kg.ha-1 (without) NPK and 0% (without) humic acid, NPK + 0% (without) humic acid, NPK + 5% humic acid, NPK + 10% humic acid, and NPK + 15% humic acid. NPK fertilizer applied was NPK 16:16:16 at a dose of 350 kg.ha-1. The results showed that humic acid application on acid soil increased C-humic content in the soil, soil P availability, total dry weight of the plant, and kernel dry weight at harvest (15 weeks after planting). The increase in soil P availability did not improve the plant growth but increased the accumulation of plant biomass.  The application of humic acid at 15% (52.5 kg.ha-1) combined with NPK fertilizer on acid soil significantly increased total dry weight of plant and kernel dry weight up to 13.14% and 21.81%, respectively, thus, it is recommended for maize cultivation on acid soil.