3 research outputs found
Study of Bacillus subtilis Bacteria and Drought Tolerance in Upland Rice (Oryza Sativa L.) an Approach to Understanding Mechanisms and Interactions
No full textRice is the main staple crop providing carbohydrates for the majority of the
world's population. A primary challenge in the cultivation of upland rice is drought
stress. One promising technology for mitigating drought stress is the use of B.
subtilis. The objective of this study is to examine the mechanisms and interactions
of two upland rice varieties, Sigambiri Merah and Inpago 13 Fortiz, under drought
stress conditions and different B. subtilis application methods. The experiment was
conducted in the Greenhouse of the Faculty of Agriculture, Universitas Sumatera
Utara, using a Randomized Complete Block Design with three factors and three
replications. The first factor was the rice varieties: Sigambiri Merah (local
superior) and Inpago 13 Fortiz (superior). The second factor was the rhizosphere
microbial application technique: no application, application to seeds, and
application at 3 weeks after planting (WAP). The third factor was soil moisture
content: 40%, 60%, and 80% field capacity. The results showed significant
differences between Sigambiri Merah and Inpago 13 Fortiz in average plant height,
leaf area, proline content, H2O2 content, with higher empty grain percentage in
Sigambiri Merah. Meanwhile, Inpago 13 Fortiz showed higher values in leaf and
tiller number, shoot and root fresh weight, root length, stomata number and width,
POD and SOD content, total sugar, panicle length and number, filled grain per
clump, and filled grain weight. Application of B. subtilis at 3 WAP significantly
affected the morphological traits (plant height, leaf number, total tiller number,
shoot and root fresh weight, shoot and root dry weight, shoot-root ratio, root length,
root volume, leaf area), anatomical traits (stomata width, leaf bulliform cell
length), physiological traits (chlorophyll a, b, and total), and biochemical traits
(H2O2, POD enzyme, proline, total sugar content) of upland rice. Drought stress
treatment through soil moisture reduction significantly influenced changes in
morphological characteristics (plant height, leaf number, tiller number, shoot and
root fresh and dry weight, shoot-root ratio), anatomical characteristics (stomata
number and width, leaf bulliform cell length), physiological characteristics
(chlorophyll content), and biochemical characteristics (increased hydrogen
peroxide content, POD enzyme, proline content, total sugar) and production traits
(panicle number and length, filled grain number). The interaction of the three
factors significantly affects chlorophyll content, proline, and the number of
panicles, helping the plants to cope with stress and increase productivity.209 PagesTesis Magiste
Buku Monograf DAMPAK AKTIVITAS PERKEBUNAN KELAPA SAWIT TERHADAP KUALITAS AIR SUNGAI
No full textPuji dan syukur penulis panjatkan ke hadirat Tuhan Yang Maha Esa atas limpahan rahmat dan karunia-Nya, sehingga monograf yang berjudul “Dampak Aktivitas Perkebunan Kelapa Sawit terhadap Kualitas Air Sungai” ini dapat disusun dan diselesaikan dengan baik. Monograf ini disusun sebagai bagian dari upaya akademik untuk memahami hubungan antara aktivitas pemanfaatan lahan, khususnya perkebunan kelapa sawit, dengan kondisi kualitas air sungai sebagai salah satu komponen penting dalam sistem lingkungan. Perkebunan kelapa sawit merupakan sektor strategis yang berkontribusi besar terhadap pembangunan ekonomi dan kesejahteraan masyarakat. Namun, perkembangan aktivitas perkebunan yang pesat juga memerlukan perhatian terhadap aspek lingkungan, terutama yang berkaitan dengan keberlanjutan sumber daya air. Sungai sebagai bagian dari daerah aliran sungai (DAS) memiliki fungsi ekologis, sosial, dan ekonomi yang vital, sehingga perubahan kualitas air sungai dapat berdampak luas terhadap kehidupan masyarakat dan ekosistem di sekitarnya. Monograf ini membahas berbagai aspek yang berkaitan dengan sungai dan daerah aliran sungai, meliputi gambaran umum sungai, karakteristik DAS, aktivitas pemanfaatan lahan di sekitarnya, potensi sumber pencemaran, serta kerangka regulasi yang mengatur pengelolaan dan pengendalian pencemaran air. Kajian yang disajikan dalam monograf ini disusun berdasarkan hasil penelitian lapangan yang dilaksanakan pada tahun 2018 di Sungai Ular, yang kemudian diperkaya dengan telaah literatur ilmiah dan regulasi lingkungan yang relevan. Pembahasan disusun berdasarkan kajian literatur ilmiah, laporan resmi pemerintah, peraturan perundang-undangan yang berlaku, serta sumber informasi terpercaya lainnya. Dengan pendekatan tersebut, monograf ini diharapkan mampu menyajikan kajian yang objektif dan berimbang mengenai dampak aktivitas perkebunan kelapa sawit terhadap kualitas air sungai.
Penulis menyadari bahwa kajian mengenai dampak lingkungan merupakan isu yang kompleks dan dinamis, serta memerlukan data dan analisis yang berkelanjutan. Oleh karena itu, monograf ini diharapkan dapat menjadi salah satu referensi awal bagi akademisi, mahasiswa, peneliti, praktisi lingkungan, serta para pemangku kepentingan dalam memahami permasalahan kualitas air sungai dan mendorong upaya pengelolaan lingkungan yang lebih baik dan berkelanjutan.
Akhir kata, penulis berharap monograf ini dapat memberikan manfaat dan kontribusi positif bagi pengembangan ilmu pengetahuan serta menjadi bahan pertimbangan dalam pengambilan kebijakan terkait pengelolaan kualitas air sungai di wilayah dengan aktivitas perkebunan kelapa sawit. Kritik dan saran yang bersifat membangun sangat diharapkan demi penyempurnaan karya ini di masa yang akan datang
Analysis Of Biomass Of Mucuna Bracteata DC Due To The Provision Of Coffee Skin Waste As An Alternative Fertilizer
No full textBiomass Analysis of Mucuna bracteata DC Due to the Application of Coffee Husk Waste as an Organic Nutrient Source. Mucuna bracteata DC is a cover crop that plays a crucial role in soil conservation and soil fertility improvement. This study aims to analyze the effect of liquid organic fertilizer (LOF) derived from coffee husk waste on the biomass growth of Mucuna bracteata DC, particularly in terms of fresh shoot weight, fresh root weight, dry shoot weight, and dry root weight. The research was conducted at Jalan Kuali No. 50, Medan Petisah District. The experiment was designed using a Completely Randomized Block Design (CRBD) with a single-factor treatment consisting of seven LOF dosage levels: K0 (no treatment), K1 (5 mL/polybag), K2 (10 mL/polybag), K3 (15 mL/polybag), K4 (20 mL/polybag), K5 (25 mL/polybag), and K6 (30 mL/polybag), with four replications, totaling 28 experimental plots. The results showed that the application of coffee husk LOF significantly affected the biomass growth of Mucuna bracteata DC. The highest fresh shoot weight (9.51 g) and dry shoot weight (2.14 g) were recorded in treatment K6 (30 mL/polybag), whereas the highest fresh root weight (2.29 g) and dry root weight (0.32 g) were observed in treatment K5 (25 mL/polybag). Higher LOF doses generally increase plant biomass up to an optimal threshold, beyond which nutrient absorption efficiency by roots declines. Overall, the optimal LOF dosage for maximizing biomass growth in Mucuna bracteata DC ranges between 25–30 mL/polybag. The use of coffee husk waste as an organic nutrient source presents a sustainable alternative for improving plant productivity while reducing dependency on synthetic fertilizers
