Judul: Application of Geotextiles and Plastics as Covering Materials in The Production of Solid Organic Fertilizers from Oil Palm Fiber Waste
Abstrak: Serabut kelapa sawit memiliki C/N rasio yang tinggi sehingga dalam pemanfaatannya sebagai pupuk organik padat diperlukan proses pengomposan agar dapat menurunkan C/N rasio. Proses dalam pembuatan pupuk organik padat memerlukan bahan penutup, sehingga penggunaan bahan penutup yang baik diperlukan agar dapat menghasilkan pupuk organik yang efektif dan memenuhi syarat berdasarkan Keputusan Menteri Pertanian Republik Indonesia No. 261 Tahun 2019. Penelitian ini dilakukan menggunakan rancangan acak lengkap (RAL) 2 × 2, masing-masing kombinasi perlakuan dibuat 2 ulangan. Proses pengomposan dilakukan selama 30 hari dan dilakukan pembalikan setiap 3 hari. Parameter yang dianalisis meliputi aspek kualitas fisik yaitu, warna dan bau; kualitas kimia yaitu, pH, N-total, C/N rasio, P-total (P2O5), dan K-total (K2O); serta kualitas biologi yaitu, total mikrob dan aktivitas mikrob. Hasil penelitian menunjukkan bahwa aplikasi bahan penutup geotekstil menghasilkan pupuk organik padat yang lebih baik dibandingkan bahan penutup plastik secara kualitas fisik, kimia, maupun biologi. pH dan total hara makro telah memenuhi syarat, kecuali C/N rasio. Pupuk organik padat kualitas terbaik terdapat pada perlakuan bahan penutup geotekstil dengan penambahan mikrob., Oil palm fiber has a high C/N ratio so that in its utilization as a solid organic fertilizer, a composting process is needed in order to reduce the C/N ratio. The process of making solid organic fertilizer requires a covering material, so the use of a good covering material is needed in order to produce an effective organic fertilizer and meet the requirements based on the Decree of the Minister of Agriculture of the Republic of Indonesia No. 261 of 2019. This study was conducted using a completely randomized design (CRD) 2 × 2, each treatment combination made 2 replications. The composting process is carried out for 30 days and is turned every 3 days. Parameters analyzed include aspects of physical quality, chemical quality, and biological quality. The results showed that the application of geotextile covering material produced solid organic fertilizer which was better than plastic covering material in physical, chemical, and biological quality. pH and total macronutrients counts were met, except for the C/N ratio. The best quality solid organic fertilizer is found in the treatment of geotextile covering material with the addition of microbes.
Keyword: microbes, minister of agriculture regulations, quality of fertilizer, respiration, total microbes

Judul: Utilization of Weatherable Organik Materials for Improvement of Soil Physical Properties (Soil Permeability and Shear Strength)
Abstrak: Penurunan produktivitas pertanian di Indonesia umumnya disebabkan oleh terjadinya penurunan kualitas tanah akibat penggunaan tanah secara terus-menerus. Penurunan produktivitas juga dialami oleh PT Great Giant Pineapple (GGP) sejak 2018. Hal tersebut terjadi karena kandungan bahan organik yang rendah dan terjadinya pemadatan tanah. Pemadatan tanah dapat diatasi dengan pemberian bahan organik. Pemberian bahan organik sering mengalami kendala akibat residence time-nya yang relatif singkat terutama untuk tanaman berumur panjang seperti nanas. Salah satu alternatif adalah dengan memanfaatkan limbah ekstraksi bromelain yang tersedia. Penelitian ini bertujuan mengidentikasi pengaruh aplikasi limbah ekstraksi bromelain dan bambu cacah berbagai dosis terhadap proses agregasi, kekuatan geser tanah dan permeabilitas tanah. Penelitian dilakukan di lokasi 88 C2 Kebun PT GGP, Lampung Tengah dengan metode rancangan acak kelompok (RAK) faktorial. Tanah dengan perlakuan limbah ekstraksi bromelain memiliki indeks stabilitas agregat tanah yang lebih tinggi dibandingkan tanah dengan perlakuan bambu cacah. Laju permeabilitas tanah mengalami penurunan pada 5 bulan setelah aplikasi bahan organik baik pada limbah ekstraksi bromelain maupun bambu cacah. Pemberian bahan organik memicu pertumbuhan akar tanaman nanas sehingga meningkatkan nilai kekuatan geser tanah. Semakin tinggi dosis bahan organik yang diberikan maka semakin baik dampaknya terhadap sifat fisik tanah., The decline in agricultural productivity in Indonesia is generally caused by a decrease in soil quality due to continuous land use. PT Great Giant Pineapple (GGP) has also experienced a decline in productivity since 2018. This is due to the low organik matter content and soil compaction. Soil compaction can be overcome by adding organik matter. The application of organik matter often experiences problems due to its relatively short residence time, especially for long-lived plants such as pineapple. One alternative is to utilize the available bromelain extraction waste. This study aims to identify the effect of the application of bromelain extraction waste and various doses of chopped bamboo on the aggregation process, soil shear strength and soil permeability. The research was conducted at location 88 C2 of PT GGP's plantation, Central Lampung with a factorial randomized block design (RBD) method. Soil treated with bromelain waste extraction had a higher soil aggregate stability index than soil treated with chopped bamboo. The rate of soil permeability decreased 5 months after the application of organik matter in both bromelain extraction waste and chopped bamboo. The application of organik matter triggers the growth of pineapple plant roots thereby increasing the shear strength value of the soil. The higher the dose of organik matter given, the better the impact on soil physical properties.
Keyword: aggregate stability, bromelain, residence time, soil compaction

Judul: Asymptotic Distribution of Estimator for the Intensity Function of a Doubly Periodic Poisson Process
Abstrak: In this manuscript, estimation of the intensity function of a doubly periodic Poisson process is discussed. It is assumed that only a single realization of the Poisson process is observed in a bounded window [0,n]. It is also assumed that the period of the intensity function is known. The rate of consistency and asymptotic normality of the estimator are formulated. Finally, a confidence interval for the local intensity function is also formulated.
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