Efisiensi Pemupukan N dengan Aplikasi Pupuk Organik Cair Limbah Tahu pada Tanaman Kale (Brassica oleracea var. acephala)

Penggunaan pupuk urea yang semakin masif oleh petani sebagai faktor utama produksi tanaman kale yang optimal, menyebabkan banyak masalah baru. Mulai dari meningkatnya biaya produksi yang dipicu mahalnya urea, hingga degradasi lahan akibat penumpukan zat kimiawinya. Degradasi lahan memicu petani untuk semakin menambah input urea agar kebutuhan hara bagi kale dapat terpenuhi yang akhirnya justru menurunkan efisiensi penggunaannya. Perlu dicarikan solusi yang berbasis organik untuk mengatasi masalah efisiensi urea dan degradasi lahan, salah satunya dengan penggunaan limbah tahu sebagai POC. Penelitian ini bertujuan untuk 1) mengetahui dosis pupuk urea yang efisien untuk pertumbuhan tanaman kale, 2) mengetahui konsentrasi POC limbah tahu yang terbaik untuk pertumbuhan tanaman kale, 3) mengetahui kombinasi pemupukan urea dan POC limbah tahu yang terbaik untuk pertumbuhan tanaman kale, dan 4) mengetahui pengaruh pemupukan urea dan POC limbah tahu terhadap persentase efisiensi serapan N tanaman kale. Penelitian ini dilaksanakan di Desa Karangkemiri, Kecamatan Karanglewas, Kabupaten Banyumas dengan ketinggian 110 m dpl, serta di Laboratorium Agronomi dan Hortikultura Fakultas Pertanian, Universitas Jenderal Soedirman dari bulan Agustus sampai Oktober 2019. Penelitian menggunakan Rancangan Acak Kelompok Lengkap (RAKL) yang terdiri dari 2 faktor, yaitu 4 taraf dosis pupuk urea berupa U0 (0 g/tanaman), U1 (0,20 g/tanaman), U2 (0,41 g/tanaman), dan U3 (0,82 g/tanaman) serta 4 taraf konsentrasi POC limbah tahu berupa T0 (0 ml/l air), T1 (50 ml/l air), T2 (100 ml/l air), dan T3 (150 ml/l air), sehingga diperoleh 16 kombinasi perlakuan. Penelitian diulang 3 kali dengan tiap unit terdiri dari 3 tanaman, sehingga keseluruhan terdapat 144 tanaman. Variabel yang diamati dan diukur meliputi tinggi tanaman, jumlah daun, luas daun, bobot tajuk segar, bobot tajuk kering, panjang akar, bobot akar segar, bobot akar kering, serapan nitrogen, kadar klorofil daun, dan pH tanah. Data hasil penelitian dianalisis ragam pada taraf kesalahan 5% dan jika terdapat perbedaan yang signifikan, maka dilakukan uji lanjut dengan Duncan’s Multiple Range Test (DMRT) pada taraf kesalahan 5%. Hasil penelitian menunjukkan bahwa pemupukan urea dosis 0,41 g/tanaman atau 50% dosis rekomendasi berpengaruh terhadap tinggi dan bobot tajuk segar tanaman kale, sedangkan dosis 0,82 g/tanaman berpengaruh terhadap luas daunnya. Pemupukan POC limbah tahu konsentrasi 150 ml/l air berpengaruh terhadap tinggi tanaman kale, sedangkan konsentrasi 0 ml/l air berpengaruh terhadap bobot akar keringnya. Pemupukan POC limbah tahu konsentrasi 150 ml/l air tidak mampu memberikan efisiensi pemupukan urea sebesar 50% dari dosis rekomendasi, tapi konsentrasi 50 ml/l air yang mampu memberikannya dan berpengaruh terbaik hanya terhadap luas daun tanaman kale. Pemupukan urea dan POC limbah tahu tidak mampu meningkatkan persentase efisiensi serapan N tanaman kale secara optimal

Diversity of culturable moderately halophilic and halotolerant bacteria in a marsh and two salterns a protected ecosystem of Lower Loukkos (Morocco)

To study the biodiversity of halophilic bacteria in a protected wetland located in Loukkos (Northwest, Morocco), a total of 124 strains were recovered from sediment samples from a marsh and salterns. 120 isolates (98%) were found to be moderately halophilic bacteria; growing in salt ranges of 0.5 to 20%. Of 124 isolates, 102 were Gram-positive while 22 were Gram negative. All isolates were identified based on 16S rRNA gene phylogenetic analysis and characterized phenotypically and by screening for extracellular hydrolytic enzymes. The Gram-positive isolates were dominated by the genus Bacillus (89%) and the others were assigned to Jeotgalibacillus, Planococcus, Staphylococcus and Thalassobacillus. The Gram negative isolates were dominated by the genus Vibrio (41%) and the others were assigned to Halomonas, Psychrobacter, Marinobacterium, Pseudoalteromonas, Salinivibrio and Photobacterium. The growth of strains obtained under different physico-chemical conditions and the screening for hydrolytic enzymes showed a high diversity even within the same species

Design and Validation of Online Learning Environment Questionnaire

This study aims at designing and validating the questionnaire as an instrument to assess the lecturers’ perception in terms of factors affecting the ‘online learning environment’. Forty participants who have been teaching English completed the 125 items in questionnaire. The result of the study showed that average variance extracted for peer support was 0.66 and instructor support was 0.52 indicating adequate convergence. The construct reliability showed value of 0.83 for peer support and 0.70 for instructor support indicating the good construct validity. Peer support and instructor support constructs in this study were the model fit to the factors affecting the ‘online learning environment

Selection of halophilic bacteria for biological control of tomato gray mould caused by Botrytis cinerea

In Morocco, tomato gray mould caused by Botrytis cinerea Pers: Fr. is a serious threat for postharvest storage of tomatoes. Fifteen halophilic bacteria were evaluated for their antagonistic activity against B. cinerea: 11 Gram positive strains assigned to the genera Bacillus (9), Jeotgalibacillus (1) and Planococcus (1) and four Gram negative strains assigned to the genera Salinivibrio (1), Vibrio (2) and Photobacterium (1). In in vitro screening, 12 antifungal isolates secreted diffusible compounds, hydrolytic enzymes or volatile compounds. In vivo screening of the isolates, Bacillus safensis CCMM B582 and Bacillus oceanisediminis CCMM B584 showed permanent antagonistic activity on tomato fruits, with 100% inhibition of B. cinerea after 7 days. These two strains may offer potential for biological control of tomato gray mould

Efektivitas Metode Pembelajaran Examples Non Examples terhadap Hasil Belajar Matematika

Penelitian ini bertujuan untuk mengetahui keefektifan Metode Pembelajaran Examples Non Examples terhadap hasil belajar Matematika di SMP Negeri 4 Polewali peserta didik kelas VIII dengan melihat hasil belajar, aktivitas dan respon peserta didik. Jenis penelitian ini adalah penelitian eksperimen yang melibatkan 1 kelompok yaitu peserta didik kelas VIIID. Pengumpulan data dilakukan melalui tes, lembar observasi, dan angket. Data hasil penelitian dianalisis dengan analisis deskriptif dan analisis inferensial. Hasil penelitian menunjukkan bahwa berdasarkan hasil analisis deskriptif pada kelas VIIID diperoleh nilai rata-rata sebesar 85,47 > KKM atau mencapai ketuntasan klasikal 85%, yaitu mencapai 86,84%. Dan berdasarkan analisis terhadap instrument non tes diperoleh aktivitas peserta didik pada kelas VIIID memenuhi kriteria keaktifan yaitu rata-rata persentase keaktifan peserta didik adalah 78,50% dan respon peserta didik berada pada kategori positif yaitu rata-rata persentase respon positif adalah 84,31%serta Hasil uji analisis one sampel t test diperoleh signifikansi 0,00 < 0,05, maka dapat disimpulkan bahwa Metode Pembelajaran Examples Non Examples efektif dalam meningkatkan hasil belajar Matematika peserta didik kelas VIII di SMP Negeri 4 Polewali

Selection of halophilic bacteria for biological control of tomato gray mould caused by Botrytis cinerea

In Morocco, tomato gray mould caused by Botrytis cinerea Pers: Fr. is a serious threat for postharvest storage of tomatoes. Fifteen halophilic bacteria were evaluated for their antagonistic activity against B. cinerea: 11 Gram positive strains assigned to the genera Bacillus (9), Jeotgalibacillus (1) and Planococcus (1) and four Gram negative strains assigned to the genera Salinivibrio (1), Vibrio (2) and Photobacterium (1). In in vitro screening, 12 antifungal isolates secreted diffusible compounds, hydrolytic enzymes or volatile compounds. In vivo screening of the isolates, Bacillus safensis CCMM B582 and Bacillus oceanisediminis CCMM B584 showed permanent antagonistic activity on tomato fruits, with 100% inhibition of B. cinerea after 7 days. These two strains may offer potential for biological control of tomato gray mould

Graph Aggregation Based Image Modeling and Indexing for Video Annotation

International audienceWith the rapid growth of video multimedia databases and the lack of textual descriptions for many of them, video annotation became a highly desired task. Conventional systems try to annotate a video query by simply finding its most similar videos in the database. Although the video annotation problem has been tackled in the last decade, no attention has been paid to the problem of assembling video keyframes in a sensed way to provide an answer of the given video query when no single candidate video turns out to be similar to the query. In this paper, we introduce a graph based image modeling and indexing system for video annotation. Our system is able to improve the video annotation task by assembling a set of graphs representing different keyframes of different videos, to compose the video query. The experimental results demonstrate the effectiveness of our system to annotate videos that are not possibly annotated by classical approaches

Design and validation of online learning environment questionnaire

This study aims at designing and validating the questionnaire as an instrument to assess the lecturers' perception in terms of factors affecting the 'online learning environment'. Forty participants who have been teaching English completed the 125 items in questionnaire. The result of the study showed that average variance extracted for peer support was 0.66 and instructor support was 0.52 indicating adequate convergence. The construct reliability showed value of 0.83 for peer support and 0.70 for instructor support indicating the good construct validity. Peer support and instructor support constructs in this study were the model fit to the factors affecting the 'online learning environment'