Jurnal Ilmu Tanah dan Lingkungan
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Improvement of growth and yield of organic broccoli (Brassica oleracea var. Italica) by application of different organic materials combination
Full text linkPot experiment was conducted to evaluate the effect of organic materials combination on improvement of growth and yield of organic broccoli. There were 19 treatments in total consisted of four types organic materials that were azolla (A), vermicompost (V), cow dung (S), and chicken manure (F) applied in combination, blank control, and inorganic fertilizer as comparison standard. The experiment results showed that application of organic materials combination significantly increased the growth of plant, diameter head and yield of broccoli compared with untreated soil and inorganic fertilizer treatment. The addition of dolomite into the organic materials combination tended to decrease the growth and yield of broccoli than no addition of dolomite. However, the addition of chicken manure into the combination showed higher growth and yield of broccoli. The best combination of organic materials in raising the growth and yield of broccoli was azolla, and chicken manure (A+F)
Exchangeable aluminum and available phosphorus in the soils of Bangka Belitung Province: Aluminium Dapat Dipertukarkan dan Fosfor Tersedia pada Tanah di Provinsi Bangka Belitung
Full text linkProduktivitas lada di Provinsi Bangka Belitung mengalami penurunan karena salah satunya penyebabnya adalah masalah ketersediaan hara yang rendah. Penelitian dilakukan di Provinsi Bangka Belitung untuk menentukan distribusi pH, aluminium yang dapat ditukar (Al-dd), dan fosfor (P) yang tersedia dan korelasi antar parameter tersebut. Contoh tanah pada kedalaman 0-30 cm dan 30-60 cm diambil pada titik yang telah ditentukan pada peta sistem lahan skala 1: 250,000. pH ditetapkan dengan mengocok contoh tanah dengan air destilata dan rasio contoh tanah dan air destilata adalah 1:5. Al-dd diekstraksi menggunakan 1.00 mol L-1 KCl dan ditetapkan dengan titrasi. P tersedia ditetapkan menggunakan metode Bray 1. Analisis statistik dasar untuk memperoleh nilai minimum, maksimum, rata-rata dan standar deviasi dilakukan. Uji korelasi antara pH, Al-dd, dan P tersedia untuk mengevaluasi hubungan antar parameter tersebut dilakukan. Hasil penelitian menunjukkan bahwa tanah di Bangka Belitung relatif asam, Al-dd yang relatif tinggi terutama di kedalaman 0-30 cm dan Bray 1-P yang relatif rendah. Bray 1-P dan Al yang dapat ditukar pada kedalaman 0-30 cm memiliki SD yang lebih tinggi daripada paramater lainnya. Untuk uji korelasi, pH secara signifikan berkorelasi negatif dengan Al-dd. pH dan Al-dd tidak berkorelasi dengan Bray 1-P. Penelitian ini menunjukkan bahwa tanah di Bangka Belitung memiliki masalah dengan kemasaman tanah dan rendahnya jumlah P yang tersedia dalam bentuk Bray 1-P. Bray 1-P tidak berkorelasi dengan jumlah Al-dd.Productivity of pepper in Bangka Belitung Province has decreased because one of the causes is the problem of the low nutrient availability. The research was conducted in Bangka Belitung Province to determine the distribution of pH, exchangeable aluminium (Exch Al), and available phosphorus (P) and the correlation among those parameters. Soil samples at depths of 0-30 cm and 30-60 cm were collected at the specified points on a 1: 250,000 scale land system map. The pH was determined by shaking the soil sample with distilled water and the ratio of soil sample and distilled water was 1:5. Exch Al was extracted using 1.00 mol L-1 KCl and determined by titration. Available P was determined using the Bray 1 method. Basic statistic analyses to have minimum, maximum, average and standar deviation (SD) values were conducted. Correlation test among pH, exch Al, and available P to evaluate their relationship were also conducted. The results showed that soils in Bangka Belitung were relatively acid, relatively high exch Al especially in the depth of 0-30 cm and relatively low available P as Bray 1-P. Bray 1-P and exch Al on the depth of 0-30 cm had higher SD than that of the other paramaters. As for correlation analyses, pH significantly negatively correlated with exch Al. pH and exch Al did not correlate with Bray 1-P. This research suggested that soil in Bangka Belitung had problem with soil acidity and low amount of available P in the form of Bray 1-P. The amount of Bray 1-P did not correlate with the amount of exch Al
Land Suitability of Rice Fields in Bumi Rapak Village and Selangkau Village East Kutai Regency: Kesesuaian Lahan Padi Sawah di Desa Bumi Rapak dan Desa Selangkau Kabupaten Kutai Timur
Full text linkLahan sawah produksi utamanya adalah gabah yang menghasilkan beras sebagai bahan utama makanan rakyat Indonesia. Kesesuaian lahan terhadap padi sawah dipengaruhi oleh karakteristik lahan yang dapat dievaluasi sesuai atau tidak sesuai dan faktor pembatasnya. Kabupaten Kutai Timur di Provinsi Kalimantan Timur terdapat lahan sawah yang cukup luas sebagai penghasil gabah yang terdapat di Desa Bumi Rapak dan Desa Selangkau. Penelitian berusaha untuk memahami dan menyelami kelas kesesuaian lahan sawah di Desa Bumi Rapak, Desa Selangkau, dan faktor pembatas utama. Metode diterapkan dengan pencocokan antara persyaratan tumbuh padi sawah dengan karakteristik lahan sawah. Terbukti bahwa rendahnya ketersediaan hara P2O5, sehingga kelas kesesuaian lahan aktual padi sawah sesuai marginal (S3) dan sub kelas S3n, produktivitas hanya 4,54 ton ha-1. Usaha perbaikan yang dilakukan masukan rendah hingga sedang dengan pemberian pupuk SP-36 dosis 100 kg ha-1 tiap musim tanam, kelas kesesuaian naik menjadi cukup sesuai (S2) dan sub kelas S2n diharapkan produktivitas akan naik menjadi 5,00-6,00 ton (ha-1).The major production of paddy fields is grain, which produces rice as the principal ingredient of Indonesian people’s food. The characteristics of the land that can be evaluated or not suitable and the limiting factors influence the suitability of land for lowland rice. East Kutai Regency in East Kalimantan Province has a fairly large paddy field as a grain producer in Bumi Rapak Village and Selangkau Village. The research objectives to understand and explore the suitability class of paddy fields in Bumi Rapak Village, Selangkau Village, and the principal limiting factors. The method applied by matching the growing requirements of lowland rice with the characteristics of paddy fields. We prove that the low availability of P2O5 nutrients so that the actual land suitability class for lowland rice is marginally suitable (S3) and sub-class S3n; the productivity is only 4.54 tons (ha-1). Improvement efforts carried out by low-to-moderate inputs with the application of SP-36 fertilizer at a dose of 100 kg (ha-1) per growing season, the suitability class increases of quite appropriate (S2) and the S2n sub-class expected to increase productivity to 5.00-6.00 tons (ha-1)
Dosage of Empty Palm Oil Bunches Compost with Cellulolytic Bacteria on Corn (Zea Mays L.) Growth in Ultisol Soil: Dosis Kompos Tandan Kosong Kelapa Sawit (TKKS) Ber-Bakteri Selulolitik terhadap Pertumbuhan Jagung (Zea mays L.) di Tanah Ultisol
No full textPenelitian bertujuan untuk memanfaatkan tanah Ultisol dalam meningkatkan pertumbuhan dan produksi jagung dengan memperbaiki kendala pada tanah Ultisol, salah satu kendala yaitu kandungan bahan organik yang rendah. Pemberian kompos tandan kosong kelapa sawit (TKKS) ber-bakteri selulolitik merupakan alternatif untuk memperbaiki kendala pada tanah Ultisol tersebut. Penelitian telah dilaksanakan di kebun percobaan Fakultas Pertanian Universitas Riau pada bulan November 2020 sampai Maret 2021. Penelitian dilakukan secara eksperimen dengan menggunakan rancangan acak lengkap (RAL) non faktorial dengan 4 ulangan. Pemberian kompos TKKS ber-bakteri selulolitik sebagai berikut: T0 = 0 t.ha-1, T1 = 5 t.ha-1, T2 = 10 t.ha-1, T3 = 15 t.ha-1, T4 = 20 t.ha-1. Data hasil pengamatan selanjutnya dianalisis secara statistik menggunakan analisis ragam dengan uji lanjut BNJ pada taraf 5%. Pengamatan dilakukan terhadap tinggi tanaman, umur muncul bunga jantan, umur muncul bunga betina, berat kering tanaman dan rasio tajuk akar. Hasil penelitian ini menunjukkan bahwa pemberian kompos TKKS ber-bakteri selulolitik meningkatkan secara nyata tinggi tanaman, muncul bunga jantan, muncul bunga betina, berat kering tanaman dan rasio tajuk akar. Berdasarkan hasil penelitian dianjurkan menggunakan TKKS ber-bakteri selulolitik dengan dosis 20 t.ha-1 untuk mendapatkan pertumbuhan yang terbaik.This research aims to utilize Ultisol soil in increasing the growth and production of corn by improving the constraints on Ultisol soil, one of which is low pH and low organic matter. Application of compost for oil palm empty fruit bunches with cellulolytic bacteria is an alternative to improve the problem of Ultisol soil. This research was carried out in the experimental garden of the Faculty of Agriculture, Riau University from November 2020 to March 2021. This research was conducted experimentally used a non-factorial experiment with 4 replications. Application of oil palm empty fruit bunches compost with cellulolytic bacteria as follows: T0 = 0 t.ha-1, T1 = 5 t.ha-1, T2 = 10 t.ha-1, T3 = 15 t.ha-1, T4 = 20 t.ha-1. The results of this research indicate that the application of 20 t.ha-1 couldgive a significant effect on each parameter such as plant height, male flower appearance, female flower appearance and plant dry weight. Based on the results of the research, it is recommended to use oil palm empty fruit bunches compost with cellulolytic bacteria at a dose of 20 t.ha-1 to get optimal results
Land Use Identification and Spatial Pattern Suitability Analysis using 2020 Landsat 8 OLI Imagery: Case Study: Cikeruh, Citarik, and Cirasea Sub-watersheds
Full text linkSub-DAS Cikeruh, Citarik, dan Cirasea merupakan salah satu bagian DAS Citarum yang masuk ke dalam 15 DAS prioritas pemulihan lahan kritis. Salah satu penyebab terjadinya kekritisan lahan adalah pemanfaatan lahan yang tidak sesuai dengan kapabilitas lahan ataupun arahan pola ruang. Tujuan dari penelitian ini adalah untuk mengetahui jenis penggunaan lahan di Wilayah Sub-DAS Cikeruh, Citarik, dan Cirasea pada tahun 2020 serta mengevaluasi kesesuaian penggunaan lahan terhadap Pola Ruang RTRWP Jawa Barat periode 2009-2029. Penelitian ini dilakukan melalui pendekatan analisis kuantitatif deskriptif melalui interpretasi citra satelit Landsat 8 OLI metode supervised classification dengan algoritma maximum likelihood dan analisis kesesuaian menggunakan metode overlay (union) antara data penggunaan lahan yang dihasilkan terhadap Pola Ruang RTRWP Jawa Barat. Hasil dari proses interpretasi citra Landsat 8 OLI teridentifikasi 5 jenis penggunaan lahan dengan luas tertinggi, yaitu: Pertanian lahan kering, hutan, lahan terbangun, sawah, dan lahan terbuka dengan luas masing-masing 35,696.60 Ha (41.78 %), 14,819.90 Ha (17.34%), 12,959.50 Ha (15.17%), 9,112.95 Ha (10.67%), 5,862.92 (6.86%). Tingkat akurasi dari hasil klasifikasi tersebut memiliki nilai overall accuracy 91.25% dan indeks kappa mencapai 0.90. Berdasarkan hasil analisis kesesuaian penggunaan lahan tahun 2020 terhadap Rencana Tata Ruang Wilayah menunjukkan bahwa 40,997.18 Ha (47.98%) sesuai, 17,172.46 Ha (20.10%) belum sesuai, dan 27,276.99 Ha (31.92%) tidak sesuai.Cikeruh, Citarik, and Cirasea sub-watersheds are part of the Citarum watershed which has been included in the 15 priority watersheds for critical land restoration. One of the causes of land criticality is land uses that is not in accordance with land capabilities or spatial pattern directions. The purpose of this study was to identify the types of land use in Cikeruh, Citarik, and Cirasea Sub-watersheds in 2020 and to evaluate the suitability of land use based on the spatial pattern of the West Java Regional Spatial Plans period of 2009-2029. This research was conducted through a descriptive-quantitative analysis approach through interpretation of Landsat 8 OLI satellite imagery using supervised classification method and maximum likelihood algorithm. Suitability analysis was conducted using the overlay (union) method between the resulted land use data and the spatial pattern of the West Java Regional Spatial Plans. The results of the Landsat 8 OLI image interpretation identified 5 land uses with the highest area, showed: dry land agriculture, forest, built-up land, rice field, and bare land covered 35,696.60 ha (41.78%), 14,819.90 ha (17.34%), 12,959.50 ha (15.17 %), 9,112.95 ha (10.67%), 5,862.92 (6.86%) respectively. The accuracy level of the classification showed an overall accuracy value of 91.25% and a kappa index reached 0.90. Based on the results of the 2020 land use analysis of the Regional Spatial Plan, it showed that 40,997.18 Ha (47.98%) was suitable, 17,172.46 Ha (20.10%) was not suitable yet, and 2,276.99 Ha (31.92%) ) was not suitable
The Effect of Cow Manure Compost and Fly Ash-Bottom Ash (FABA) Addition on the Chemical Properties of Sandy Soil and Tomato Growth: Pengaruh Penambahan Kompos Kotoran Sapi dan FABA Terhadap Karakteristik Kimia pada Tanah Berpasir dan Pertumbuhan Tanaman Tomat
No full textTanah berpasir memiliki kemampuan retensi air, kemantapan agregat, dan kadar unsur hara yang tergolong rendah. Untuk meningkatkan kualitas tanah berpasir ini dilakukan upaya pemberian berbagai dosis campuran kompos dan fly ash-bottom ash (FABA) sebagai amelioran. Tujuan penelitian ini yaitu menguji pengaruh pemberian kompos dan FABA sebagai bahan amelioran pada tanah berpasir terhadap karakteristik kimia tanah dan pertumbuhan tanaman tomat (Solanum lycopersicum). Percobaan pot dilakukan di Rumah Kaca Cikabayan, IPB University menggunakan Rancangan Acak Lengkap (RAL) dengan tujuh perlakuan dengan dua kali ulangan. Masing-masing 5 kg tanah berpasir per pot dicampur dengan kompos dan FABA pada berbagai dosis. Tanaman yang digunakan ialah tomat varitas SL 975. Parameter karakteristik kimia tanah yang diamati meliputi C-organik, N-total, P-tersedia, KTK, dan basa-basa dapat ditukar. Parameter pertumbuhan tanaman diamati pada lima minggu setelah tanam (MST). Hasil percobaan menunjukkan bahwa perlakuan A6, yaitu penambahan 1,950 gram kompos pot-1 dan 25 gram FABA pot-1, menghasilkan kadar C-organik tanah yang tinggi sebesar 3.83%, serta tinggi, jumlah daun, dan bobot basah tanaman tertinggi dengan nilai secara berturut-turut yaitu 54.4 cm, 21 lembar, dan 68.7 gram.Sandy soil has a low: ability of water retention, aggregate stability, and nutrient content. To improve its quality a mixture of compost and fly ash-bottom ash (FABA) need to be added to this soil. This study was aimed to determine the effect of compost and FABA as an ameliorant on the chemical properties of sandy soil and plant growth of tomato (Solanum lycopersicum). The pot experiment was carried out at Cikabayan Greenhouse, IPB University using a Completely Randomized Design with seven treatments and two replications. Each 5 kg of sandy soil per pot were mixed with cow manure compost and FABA at various doses. The test plant was tomato variety SL 975. Parameters of soil chemical properties were observed for organic-C, total N, available P, CEC, and exchangeable bases. Plant growth was observed at five weeks after planting (WAP). The A6 treatment, i.e. addition of 1,950 gram compost pot-1 and 25 gram FABA pot-1, showed the highest organic-C content in the soil (3.83%) as well as the plant height, leaf number, and fresh weight by 54.4 cm, 21 sheet, and 68.7 gram
Synthesis Zeolite X/Silver and Copper Oxide Composite via Tollens Reactions and Its Application as Adsorbent: Sintesis Komposit Zeolit X/Oksida Perak dan Tembaga Melalui Reaksi Tollens Serta Aplikasinya Sebagai Adsorben
No full textZeolit adalah mineral aluminosilika berpori mikro sehingga memiliki permukaan yang luas. Permukaannya yang luas menyebabkan zeolit umum digunakan sebagai adsorben. Zeolit X termasuk dalam struktur Faujasit dan biasa mengikat kation natrium. Kation yang terikat pada zeolit dapat ditukar dengan kation lainnya, seperti kation logam transisi. Kation logam transisi seperti [Ag(NH3)2]+ biasa digunakan sebagai pendeteksi gugus aldehida atau biasa dikenal sebagai pereaksi Tollens. Penelitian ini bertujuan menyintesis komposit adsorben zeolit X/oksida perak dan zeolit X/oksida tembaga melalui reaksi Tollens. Komposit dikarakterisasi menggunakan scanning electron microscope menunjukkan permukaan milik komposit lebih kasar dari pada permukaan zeolit X. Bahan yang digunakan sebagai model untuk adsorpsi ialah, gas amonia. Komposit yang dihasilkan ada tiga jenis berdasarkan tahapan penambahan zeolit pada proses sintesis, yaitu setelah penambahan prekursor (komposit 1), setelah penambahan NH4OH (komposit 2), dan setelah pemanasan (komposit 3). Komposit yang dihasilkan mampu meningkatkan adsorpsi amonia hingga 2 kali lipat daripada zeolit X.Zeolite is a micro porous aluminosilic mineral that has a wide surface. Its wide surface causes zeolite to be commonly used as an adsorbent. Zeolite X is included in the Faujasite structure and usually binds sodium cations. Cations bound to zeolites can be exchanged for other cations, such as transition metal cations. Transition metal cations such as [Ag(NH3)2]+ are commonly used to detect aldehyde groups or commonly known as Tollens reagents. This study aims to synthesize composite adsorbent zeolite X / silver oxide and zeolite X / copper oxide through Tollens reaction. Composites characterized using scanning electron microscope showed that the composite surface was coarser than the surface of zeolite X. The material used as a model for adsorption was ammonia gas. The resulting composites are of three types based on the stages of zeolite addition in the synthesis process, namely after the addition of a precursor (composite 1), after addition of NH4OH (composite 2), and after heating (composite 3). The resulting composite can increase the adsorption of ammonia by up to 2 times than zeolite X
Strategi Pengendalian Konversi Lahan Sawah untuk Mempertahankan Swasembada Pangan di Kabupaten Toba: Strategies to Control Paddy Field Conversion for Mantaining Food Sufficiency in Toba Regency
Full text linkKrisis pangan menjadi isu penting yang dihadapi banyak negara, salah satunya Indonesia. Konversi lahan sawah menyebabkan penurunan produksi beras di berbagai wilayah seperti di Kabupaten Toba. Konversi lahan sawah perlu dikendalikan secara strategis untuk mempertahankan eksistensinya sebagai area produksi pangan. Penelitian ini bertujuan untuk: 1) mengidentifikasi isu konversi, ketersediaan, dan kebutuhan beras, 2) mengindentifikasi faktor kekuatan, kelemahan, peluang, dan ancaman (faktor SWOT) pengendalian konversi lahan sawah, 3) menyusun strategi pengendalian konversi lahan sawah di Kabupaten Toba. Faktor SWOT diidentifikasi melalui metode desktriptif, studi pustaka, dan wawancara. Strategi pengendalian dianalisis menggunakan metode Analytical Hierarchy Process (AHP) dan Strenghts, Weaknesses, Opportunities, Threats (SWOT). Hasil penelitian diperoleh bahwa ketersediaan beras turun sebesar 7,030 ton dan kebutuhan naik sebesar 4,001 ton pada periode 2010-2020 disebabkan konversi lahan sawah sebesar 3,529 ha dan peningkatan jumlah penduduk. Faktor kekuatan utama dalam pengendalian konversi lahan sawah yaitu kesesuaian lahan padi, kelemahan utama yaitu tingkat pendidikan rendah sampai sedang, peluang utama yaitu aksesibilitas mendukung, dan acaman utama yaitu PERDA LP2B belum ditetapkan. Prioritas utama strategi pengendalian konversi lahan sawah di Kabupaten Toba yaitu penyusunan PERDA LP2B, memberikan bantuan input produksi kepada petani, dan mengalokasikan dana APBD pada sektor pertanian untuk pembangunan infrastruktur pertanian.The food crisis is an important issue faced by many countries, including Indonesia. Paddy field conversion caused decreasing rice production in many regions, one of which is in Toba Regency. Paddy field conversion should be controlled strategically to maintain the existence of the field for food production. This study aims: 1) to identify the conversion, availability, and rice needs 2) to identify the strengths, weaknesses, opportunities, and threats (SWOT factor) affecting paddy field conversion, 3) to generate strategies that control paddy field conversion. The SWOT factors were identified through descriptive methods, literature studies, and interviews. The strategies were constructed using a hybrid Analytical Hierarchy Process (AHP) and SWOT method. The results showed that rice availability decreased by -7,030 and demand increased by 4,001 tons between 2010 and 2020 due to paddy field conversion by 3,529 ha and increasing population. The main strength to be considered for controlling paddy field conversion is managing rice land, while the main weakness that might hinder the strategy is the low level of farmer education. Moreover, the main opportunity is supporting accessibility, and the main threat was regulation concerning sustainable agricultural land. The essential strategies to control paddy field conversion in Toba Regency include Land Protection Regulation, the subsidy of production input to farmers, and use of the local government budget to build agricultural infrastructure
Application of Biochar and Biofertilizer Combination on Corn in Up Land Pandeglang Regency: Aplikasi Kombinasi Biochar dan Pupuk Hayati pada Tanaman Jagung di Lahan Kering Kabupaten Pandeglang
Full text linkBiochar is an alternative amendment for improving soil is to rehabilitate degraded land, especially dry land. In addition, biochar serves as a habitat for soil microbes that play an important role in the availability of nutrients for plants. The use of biofertilizers in agriculture is part of the support for sustainable agriculture because it is environmentally friendly. This study aimed to examine effect of application biochar and biofertilizers combination on chemical and biological properties of soil as well as growth and yield of maize in an up land, Pandeglang Regency. The experimental design in this study was a factorial completely randomized design with two factors. The first factor was biochar with 3 levels (0; 2.5; 5 tons ha-1) and the second factor was combination of biofertilizer (PHC) and NPK with 5 types (100% PHC, 100% NPK, 25% PHC + 75% NPK, 50% PHC + 50% NPK, and 75% PHC + 25% NPK). Each treatment was replicated 3 times so there were 45 experimental units. The results of this study showed that the application of biochar dose of 5 tons ha-1 (B2) significantly increased K-available in soil and plant height. The combination of 75% biofertilizer and 25% NPK (P4) significantly increased the population of N2-fixing bacteria and cellulolytic bacteria. The combination of biochar dose 2 with 100% NPK fertilizer (B2P1) is the best treatment combination in improving soil nutrient status. On the other hand, the combination of application of biochar dose 1 (2.5 ton ha-1) with 50:50 concentration of biofertilizer and NPK (B1P3) has the opportunity to support the growth and yield of maize.Biochar merupakan bahan alternatif pembenah tanah dari pemanfaatan limbah biomassa berpotensi sebagai bagian dari upaya rehabilitasi lahan terdegradasi, khususnya lahan kering. Biochar juga berfungsi sebagai habitat mikrob tanah yang berperan penting dalam ketersediaan unsur hara bagi tanaman. Pemanfaatan pupuk hayati di bidang pertanian merupakan bagian dari dukungan terhadap pertanian berkelanjutan karena bersifat ramah lingkungan. Berdasarkan latar belakang tersebut, penelitian ini bertujuan untuk mengkaji pengaruh aplikasi kombinasi biochar dan pupuk hayati terhadap sifat kimia dan biologi tanah serta pertumbuhan dan hasil tanaman jagung di lahan kering Kabupaten Pandeglang. Percobaan ini merupakan percobaan faktorial dua faktor yang ditempatkan dalam rancangan acak lengkap. Faktor pertama adalah biochar dengan 3 taraf (0; 2.5; 5 ton ha-1) dan faktor kedua adalah kombinasi pupuk hayati cair (PHC) dengan pupuk NPK terdiri atas 5 macam (100% PHC, 100% NPK, 25% PHC + 75% NPK, 50% PHC + 50% NPK, dan 75% PHC + 25%NPK). Masing-masing perlakuan diulang sebanyak 3 kali sehingga terdapat 45 satuan unit percobaan. Hasil penelitian ini menunjukkan aplikasi biochar dosis 5 ton ha-1 (B2) nyata meningkatkan K-tersedia dalam tanah dan tinggi tanaman. Kombinasi pemupukan 75% pupuk hayati cair dan 25% pupuk NPK (P4) nyata meningkatkan jumlah populasi bakteri penambat N2 dan bakteri selulolitik. Kombinasi biochar dosis 2 dengan 100% pupuk NPK (B2P1) merupakan kombinasi perlakuan yang paling baik dalam memperbaiki status unsur hara tanah. Di sisi lain, kombinasi aplikasi biochar dosis 1 dengan pemupukan pupuk hayati cair dan pupuk NPK konsentrasi 50:50 (B1P3) memiliki peluang untuk mendukung pertumbuhan dan hasil tanaman jagung
Agricultural Conservation Planning on Traditional Land Management in Amarasi Barat District, East Nusa Tenggara.: Perencanaan Pertanian Konservasi pada Pengelolaan Lahan Tradisional di Kecamatan Amarasi Barat, Nusa Tenggara Timur
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Sistem pengelolaan lahan tradisional untuk kegiatan pertanian dilakukan sepanjang tahun. Hal tersebut akan memicu terjadinya degradasi tanah, jika tidak dibarengi dengan praktik konservasi tanah yang memadai, akibat erosi yang mengakibatkan lahan menjadi kritis. Penelitian ini bertujuan untuk menganalisis keramahan lingkungan dari sistem pengelolaan lahan tradisional berdasarkan analisis prediksi erosi dan menganalisis, merencanakan, dan menentukan perencanaan penggunaan lahan yang tepat atau tindakan konservasi untuk meningkatkan keramahan lingkungannya. Penelitian ini dilakukan di tiga lokasi yang mewakili tiga sistem pengelolaan lahan tradisional yaitu sistem mamar di Teunbaun, sistem tebang dan bakar di Niukbaun dan wanaternak di Merbaun, Amarasi Barat, Kupang, Nusa Tenggara Timur. Analisis yang dilakukan adalah prediksi erosi tanah menggunakan model Universal soil Loss Equation (USLE) dan Tolerable Soil Loss (TSL), kemudian perbandingan nilai erosi (A) dan nilai TSL dipertimbangkan untuk menentukan alternatif tindakan konservasi air dan tanah. Hasil penelitian menunjukkan bahwa sistem tebang dan bakar memiliki prediksi erosi tertinggi (A), diikuti oleh sistem wanaternak dan mamar. Nilai erosi (A) dapat diminimalkan dengan tindakan konservasi. Skenario pola penggunaan lahan yang ideal merekomendasikan nilai C dan P untuk menurunkan nilai A sehingga lebih kecil dari nilai TSL. Tindakan konservasi yang direkomendasikan adalah teras gulud. Pengelolaan tanaman yang dapat dilakukan adalah meningkatkan kerapatan tajuk tanaman pada beberapa lahan dengan penggunaan lahan agroforestri, hingga merotasi tanaman disertai mulsa.Traditional land management system for agricultural activities is carried out throughout the year. It will trigger soil degradation, if it is not accompanied by adequate soil conservation practices. This research aimed to analyze the environmental friendliness of traditional land management systems based on erosion predictions and analyze, plan, and determine appropriate land use planning or conservation measures to increase their environmental friendliness.This research was conducted at three locations representing three traditional land management systems i.emamar system at Teunbaun, slash and burn system at Niukbaun and silvopasture at Merbaun, Amarasi Barat, Kupang, East Nusa Tenggara. This research was conducted in several stages, such as: secondary data collection, observation or primary data collection in the field, laboratory analysis, calculation of erosion factors, prediction of erosion according to the USLE method and recommendations for soil and water conservation measures. The results showed that the slash and burn system had the highest predictive value of erosion (A), namely 2,368.7 ton ha-1 year-1, followed by thewanaternak and mamar system 599.9 to 1,534.5 ton ha-1 year-1. The erosion value (A) can be minimized with conservation measures. Hence the erosion is less than tolerable soil loss (TSL). The recommended conservation action is construction gulud terraces. Crop management that can be done is to increase the density of plant canopy through high agroforesty, crop rotation, and mulching