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All Journal Jurnal Pendidikan dan Pembelajaran Khatulistiwa (JPPK) Jurnal Biologi Tropis Media Pertanian
Sukmawati, Riska
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Education Immunology & microbiology Languange, Linguistic, Communication & Media Mathematics Other

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PENDEKATAN ANTISIPASI DIDAKTIS UNTUK MENGATASI HAMBATAN NUMBER SENSE SISWA MATERI PENJUMLAHAN PECAHAN DI MTs Sukmawati, Riska; Hartoyo, Agung; Hamdani, Hamdani
Jurnal Pendidikan dan Pembelajaran Khatulistiwa Vol 7, No 8 (2018): AGUSTUS 2018
Publisher : Jurnal Pendidikan dan Pembelajaran Khatulistiwa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (500.218 KB)

Abstract

AbstractThis study aims to describe and overcome the obstacle of number sense students by giving treatment in the form of anticipatory didactic approach in fraction addition material in class VII of MTsN Sintang. Specifically the purpose of this research is : (1) Disclose the number sense of student before being given didactic anticipation ;(2) Disclose the number sense of student after being given didactic anticipation. The research method used is descriptive analytical oriented to problem solving with the form of research is a case study. Subjects in this study were four students who got the lowest score. The results obtained from this study are that the number sense of students who have been given treatment using the anticipatory approach didactically experience a reduction from before being given treatment. So that it can be concluded that the didactic anticipation approach can reduce the obstacle of students' number senseKeywords : Didactic Anticipation Approach, Learning Obstacle, Number Sense, Fraction Addition
PENGUJIAN SIFAT BIOHERBISIDA EKSTRAK TUMBUHAN Tetracera indica L. Merr DAN SENYAWA WOGONIN PADA GULMA UJI DAN TANAMAN Sukmawati, Riska; Guntoro, Dwi; Junaedi, Ahmad
Media Pertanian Vol 9, No 2 (2024): Media Pertanian
Publisher : Program Studi Agroteknologi Universitas Siliwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37058/mp.v9i2.12059

Abstract

Tumbuhan T. indica  memiliki zat alelokimia yang dapat berperan sebagai bioherbisida. Salah satu zat alelokimia yang diduga mampu menghambat perkecambahan gulma yaitu senyawa wogonin. Penelitian dilaksanakan di Laboratorium Penyimpanan dan Pengujian Mutu Benih Fakutas Pertanian IPB pada bulan Oktober 2018 sampai dengan Juni 2019. Penelitian menggunakan rancangan acak lengkap (RAL) dengan tiga perlakuan yaitu senyawa wogonin konsentrasi 80 ppm, ekstrak T. indica  13.75 ppm dan kontrol dengan empat ulangan dihasilkan 36 satuan unit percobaan disusun pada cawan petri kemudian diberi alas satu lembar kertas Whatman no.1. Setiap cawan petri disusun 10 butir biji. Hasil penelitian menunjukkan bahwa senyawa wogonin dapat menghambat perkecambahan gulma uji Asystasia gangetica, Echinochloa crus-galli dan tanaman indikator (sorgum) ditandai dengan penurunan panjang plumula dan radikula. Penghambatan perkecambahan oleh senyawa wogonin lebih rendah pada benih sorghum yaitu pada persentase perkecambahan akhir (PPA) 57.5% dibandingkan dengan penghambatan oleh ekstrak T. indica  sebesar 72.5%. Hal ini dapat disimpulkan bahwa selain wogonin terdapat zat alelokimia lainnya yang berperan dalam proses penghambatan perkecambahan. T. indica plants have allelochemical substances that can act as bioherbicides. One of the allelochemical substances that can inhibit weed germination is wogonin compounds. The research was conducted at the Laboratory of Storage and Quality Testing of the Agriculture Faculty of IPB from October 2018 to June 2019. The study used a completely randomized design (CRD) of one factor, the wogonin compound with four replications. The treatments tested were control, standard 80 ppm wogonin compounds and T. indica extract 13.75 ppm, 36 units of experimental units were arranged on a petri dish then given a sheet of Whatman paper no.1. Each petri dish is arranged in 10 seeds. The results showed that wogonin proved to inhibit weeds and sorghum as indicator plants characterized by a long decline plumula and radicles Asystasia gangetica, decreased in radicle length in Echinochloa crusgalli weeds and affect the length of abnormal curly radicles in sorghum indicator plants. Inhibition of germination by wogonin compounds was lower in sorghum seeds ie at the percentage of final germination (PPA) of 57.5% compared with inhibition by T. indica  extract of 72.5%. These results indicated that the inhibition of test weeds and indicator plants by T. indica extract in addition to wogonin compounds was also caused by other allelochemical substances contained in T.indica extract.
Effect of Soil Tillage Systems and Boiler Ash Application on the Growth and Yield of Sugarcane (Saccharum officinarum L.) Suryana, Suryana; Zuliati, Septiarini; Sukmawati, Riska; Fadillah, Resti
Jurnal Biologi Tropis Vol. 25 No. 3 (2025): Juli-September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i3.9751

Abstract

Soil tillage and the application of organic materials such as boiler ash play a crucial role in improving soil fertility and crop productivity. This study aimed to evaluate the effects of different tillage systems and boiler ash application on the growth and yield of sugarcane (Saccharum officinarum). The experiment was arranged in a randomized complete block design (RCBD) with five treatments and three replications, involving tillage variations (plowing, harrowing, subsoiling) and 40 tons ha⁻¹ of boiler ash. Data were analyzed using the LSD test at a 5% significance level. The results showed that treatment P5 produced the best growth performance, with a plant height of 2.85 cm, stem diameter of 2.33 cm, and 15 tillers at 9 weeks after planting. This treatment also achieved the highest yield of 122.79 tons ha⁻¹, with a 7.18% increase in productivity. Positive correlations were observed between yield and plant height (R² = 0.4593) as well as stem diameter (R² = 0.793). These findings suggest that the appropriate combination of tillage techniques and boiler ash application has the potential to sustainably enhance sugarcane productivity.
Co-Authors Agung Hartoyo AHMAD JUNAEDI Dwi Guntoro Fadillah, Resti Hamdani Hamdani Suryana Suryana Zuliati, Septiarini