Adi Setiawan

Bawang merah (Allium ascalonicum L.) merupakan jenis tanaman yang memiliki nilai ekonomi yang tinggi dan permintaannya dari konsumen terus meningkat, namun produksi mengalami penurunan. Penurunan ini disebabkan oleh teknik budidaya tanaman yang belum optimal, serta kondisi lingkungan dan tanah yang tidak ideal. Penggunaan mulsa sekam padi dan pemakaian pupuk kandang ayam dengan dosis yang tepat bisa menjadi alternatif untuk mengatasi masalah penurunan hasil bawang merah. Tujuan penelitian ini adalah untuk mengetahui interaksi dan pengaruh dosis mulsa sekam padi dan pupuk kandang ayam terhadap mikroklimat, pertumbuhan serta hasil bawang merah. Penelitian ini dilaksanakan dari bulan Juni hingga Agustus 2024 di Desa Ngurensiti, Kabupaten Pati, Jawa Tengah. Rancangan penelitian yang digunakan adalah Rancangan Acak Kelompok (RAK). Berdasarkan hasil penelitian, ditemukan adanya interaksi antara dosis mulsa sekam padi dan pupuk kandang ayam terhadap suhu tanah, kelembapan tanah minimum, panjang tanaman, jumlah daun, bobot umbi segar dan kering, serta produktivitas umbi. Perlakuan dengan dosis mulsa sekam padi 10 ton ha-1 dan dosis pupuk kandang ayam 15 ton ha-1 yang menghasilkan produktivitas bawang merah tertinggi. Perlakuan dosis mulsa sekam padi 5 ton ha-1 menunjukkan kelembapan tanah, panjang tanaman, jumlah daun dan anakan lebih tinggi dibandingkan dengan dosis mulsa 10 dan 15 ton ha-1. Sementara itu, dosis pupuk kandang ayam 15 ton ha-1 menghasilkan suhu tanah, panjang tanaman, jumlah anakan dan daun yang lebih banyak dibandingkan dengan 5 dan 10 ton ha-1.

1. Oil palm (Elaeis guineensis Jacq.) is a strategic commodity in tropical regions and a major source of vegetable oil. Despite its economic importance, oil palm productivity is severely constraine...

Citronella (Cymbopogon nardus L.) is an economically valuable commodity in Indonesia which is used in perfumes, insect repellents, and for its aromatic properties. The plant could be cultivated with other crops in intercropping to optimize of agricultural land. Intercrops might challenge with...

Indonesia's current population growth rate has reached 1.13% per year, leading to increased demand for land and consequent land use conversion, including peatlands. The conversion of peatlands into oil palm plantations raises several negative issues, such as increased carbon emissions. Therefore, it is crucial to consider the characteristics of peatlands when determining their suitability for crop cultivation. This study aims to assess peat quality, nutrient retention, and soil classification in the research area and evaluate the suitability of peatlands for oil palm cultivation in Pancung Soal. The research was conducted in an oil palm plantation in Nagari Tluk Amplu Inderapura, West Sumatra, using a survey method and parameters such as peat depth, ash content, and pH. The boundaries of land suitability classes were determined based on oil palm production results. The findings indicate variations in peat quality, nutrient retention, and suitability for oil palm cultivation. The analysis initially reveals land suitability classes ranging from S3 to N. However, with modifications to certain parameters, the suitability classes can be improved to S2 and S3. These results approximate suitability based on actual field productivity. Boundary delineation for specific parameters is necessary to enhance land suitability for oil palm in the region.

Garlic (Allium sativum) is an indispensable ingredient for enriching and diversifying Indonesian cuisine taste. Indonesian people always use garlic for their daily dishes and any traditional foods. Due to its widespread culinary use, its availability in the market become critical. The main challenge to consistently growing this garlic is Fusarium oxysporum f. sp. cepae, which wilts Allium plants. The application of arbuscular mycorrhiza fungi (AMF) + Bacillus amyloliquefaciens B1 on local garlic varieties named Lumbu Hijau could effectively control F. oxysporum through in vitro and in vivo experiments. In the in vitro test, B. amyloliquefaciens B1 successfully suppressed the growth of F. oxysporum up to 53.41%. The consortium application in the greenhouse reduced disease incidence by up to 39.17%, and the efficacy of this biocontrol reached 84%. In addition, this approach also positively influenced plant growth, such as plant height, total wet shoot and root weight, and also tuber weight. As such, it is essential to use this consortium of microorganisms in field research and carry out a comprehensive investigation to identify any possible phenomena that may arise in the rhizosphere after application.

Perkembangan pertanian konvensional memunculkan kekhawatiran akan keberlanjutan sistem pertanian akibat ketergantungan input luar yang mengganggu efisiensi dan efektivitas lahan. Konsep Complex Rice System (CRS) memberikan alternatif pilihan keberlanjutan dari aspek pengelolaan lahan yang lebih terpadu. Mengombinasikan tanaman padi dengan tanaman refugia sebagai tanaman pematang, azola sebagai penambat unsur N, ikan dan itik/bebek untuk pengendali organisme pengganggu tanaman di samping itu kami juga menghitung keuntungan finansial petani. Kami melakukan diseminasi melalui kegiatan pengabdian masyarakat kepada warga dusun Klitik desa wajik Kab. Lamongan di Gapoktan gemah ripah sejumlah 46 petani terlibat dengan luasan mencapai 30 ha dengan menerapkan sekolah lapangan yang dilangsungkan pada Juni-September 2022 di satu musim tanam padi. Kegiatan diawali Survei dan Diskusi Kelompok (FGD) dilakukan sebagai kegiatan awal untuk memahami konteks lokal sistem pertanian padi dan mempersiapkan implementasinya. Kemudian kegiatan CRS berlangsung di ladang petani, berukuran ±1000 m2 dan terdiri dari 2 pengulangan perawatan. Perawatan terdiri dari, monokultur padi dan CRS. Evaluasi terhadap kegiatan dilakukan dengan diskusi kelompok, dan evaluasi terdiri dari peningkatan antusiasme dan keuntungan dari CRS dengan menanam refugia dibanding monoculture. Hasil menunjukkan produktivitas petani yang menerapkan sistem CRS lebih tinggi dibanding produktivitas sebelumnya. Hasil FGD menunjukkan lebih dari 55% petani setuju mengembangkan CRS karena pendapatan yang diperoleh meningkat dan dapat memenuhi kebutuhan hidup petani.

Platycerium elephantotis, an African epiphytic fern thriving in Indonesia, is prized for its ornamental value and medicinal potential. It aids in fern succession without harming its host, obtaining nutrients from leaf litter and roots. Special water-storing tissues and CAM photosynthesis enhance its resilience. Endophytic bacteria in its roots likely contribute to nutrient absorption, including phosphate solubilization and nitrogen fixation, similar to other fern species. Studies on these bacteria are crucial for enhancing agricultural practices by reducing chemical inputs and promoting plant growth as plant growth-promoting bacteria (PGPB), particularly in nitrogen fixation and phosphate solubilization. The research was conducted from November 2023 to January 2024. Plant samples were collected from Arjuna Park Conservation Garden, Malang, and endophytic bacteria were isolated using serial dilution and nutrient agar media. Hypersensitivity, phosphate solubilization, and nitrogen fixation tests were conducted to assess bacterial traits. The study obtained six bacterial isolates (PE 5, PE 7, PE 24, PE 25, PE 30, and PE 49) from P. elephantotis with potential as biofertilizers due to their nitrogen-fixing and phosphate-solubilizing abilities. The diverse colony morphologies indicate different bacterial species. All isolates are rod-shaped (bacilli). Gram staining shows that PE 25 and PE 49 are gram-negative, while PE 5, PE 7, PE 24, and PE 30 are gram-positive.

Drought is a major challenge in developing the integrated farming system (IFS) in Trenggalek Regency, making it one of the factors contributing to the construction of the Tugu Dam. Additionally, in developing the IFS area, it is necessary to assess soil fertility and land suitability evaluation for food and livestock feed commodities. The research was conducted in Tugu and Karangan Sub-Districts, Trenggalek Regency by conducting spatial analysis and soil survey at locations potentially affected by dam construction and soil samples analysis at the laboratory. The results of this study found that the level of soil fertility at the research site was included in the low to very low class with characteristics of acidic pH, very low C-organic, very low total N and low base saturation. While the results of the actual land suitability evaluation of rice, maize, and elephant grass showed the land suitability class S3 with limiting factors of C-organic, pH, total N, P2O5, and base saturation.

This study contributes to understanding ecological changes in land use following slash-and-burn land clearing. This study aimed to compare the richness and density of plant species and soil fertility in farmland cultivated for one year (1 Y), three years (3 Y), and five years (5 Y) after slash-and-burn, with the conditions in the secondary forest (SF) in Berau Regency of East Kalimantan. Understory plant taxon types, numbers, and soil organic matter were measured in each region using a series of nested plots. The size of each observation plot was 20 x 100 m. Data on understory vegetation composition was collected using 1 x 1 m mini plots at 20 sampling points and divided into five blocks, with a 10 m spacing between sampling points on each property. Understory vegetation species and cover percentage, litter cover percentage, open soil percentage, and soil fertility were measured for each observation plot. The results showed that the land cover percentage increased each year during the 5 years transition from secondary forest to farmland. Furthermore, within the 5 years, there was a change in understory species, particularly the presence of grasses and sedges at 3 and 5 years after the land use change. However, the transition from secondary forest to farmland within 5 years did not alter soil organic matter and total nitrogen.