Judul: Effectiveness of Mixed Bioherbicide from Mempelas (Tetracera indica L. Merr) and Nutsedge Tuber (Cyperus rotundus L.) Extract for Controlling Weeds on Kailan Cultivation
Abstrak: Kandungan senyawa yang terdapat pada ekstrak bioherbisida berbahan Tetracera indica dan Cyperus rotundus berpotensi untuk dimanfaatkan sebagai bioherbisida. Penelitian ini bertujuan mengetahui keefektifan bioherbisida campuran T. indica L. dan C. rotundus L. dalam mengendalikan gulma pada budidaya kailan. Penelitian dilakukan pada Maret-September 2022 di Agribusiness and Technology Park (ATP) IPB, Cikarawang. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan tujuh perlakuan dan empat ulangan. Perlakuan yang diuji yaitu P0=kontrol, P1=T. indica tunggal (45 kg ha-1), P2=C. rotundus tunggal (45 kg ha-1), P3= Penyiangan manual, P4=C. rotundus 45 kg ha-1 + T. indica 22,5 kg ha-1, P5=C. rotundus 22,5 kg ha-1 + T. indica 45 kg ha-1, P6=C. rotundus 45 kg ha-1 + T. indica 45 kg ha-1, sehingga terdapat 28 satuan percobaan berupa bedengan (1 m x 5 m). Hasil penelitian menunjukkan bahwa aplikasi bioherbisida campuran perlakuan P4 dan P5 efektif menekan gulma total pada 2-6 MSA, sedangkan P6 pada 2-8 MSA dibandingkan kontrol. Persentase penekanan gulma total dari bioherbisida campuran (P6) yaitu 85,18% pada 4 MSA. Aplikasi bioherbisida campuran (P6) dapat menekan pertumbuhan gulma spesies R. exaltata pada 4 MSA, C. kyllingia, E. hirta pada 2-6 MSA, C. benghalensis pada 4-6 MSA, A. conyzoides pada 4-8 MSA, serta E. indica, P. niruri, A. indica pada 2-8 MSA. Penggunaan bioherbisida dosis campuran terbukti tidak menimbulkan fitotoksisitas tanaman kailan pada 1-3 MSA., The compounds contained bioherbicide extract from Tetracera indica L. and Cyperus rotundus L. have potential as bioherbicides. The aim this study to determine effectiveness mixed bioherbicide extracts T. indica L. and C. rotundus L. for controlling weeds in kailan cultivation. The research conducted from March-September 2022 at Agribusiness and Technology Park (ATP) IPB, Cikarawang. This study used Randomized Complete Block Design (RKLT) with seven treatments and four replications. The tested treatment is P0=control, P1=T. indica single (45 kg ha-1), P2=C. rotundus single (45 kg ha-1), P3=Manual weeding, P4=C. rotundus 45 kg ha-1 + T. indica 22.5 kg ha-1, P5=C. rotundus 22.5 kg ha-1 + T. indica 45 kg ha-1, P6=C. rotundus 45 kg ha-1 + T. indica 45 kg ha-1, so there are 28 experimental units of beds (1 m x 5 m). The results showed that the application of mixed bioherbicide treatments P4 and P5 effectively suppressed total weeds at 2-6 WAA, while P6 at 2-8 WAA compared to control. The percentage of total weed suppression from mixed bioherbicide (P6) is 85.18% at 4 WAA. Application of mixed bioherbicide (P6) can suppressed growth of weed species R. exaltata at 4 WAA, C. kyllingia, E. hirta at 2-6 WAA, C. benghalensis at 4-6 WAA, A. conyzoides at 4-8 WAA, and E. indica, P. niruri, A. indica at 2-8 WAA. The application of a mixed bioherbicide did not cause the phytotoxicity of kailan plants at 1-3 WAA.
Keyword: biomass, doses, pre-emergence, toxicity

Judul: Effectiveness of Mixed Bioherbicide from Tetracera indica (L) Merr. and Cyperus rotundus L. Extract to Control Weeds in Soybean Crops
Abstrak: Salah satu penyebab penurunan produksi pada budidaya tanaman kedelai adalah gangguan gulma. Saat ini pengendalian gulma banyak dilakukan dengan pengendalian manual dan penggunaan herbisida sintetik. Penggunaan herbisida sintetik secara berulang dan berlebihan dapat menimbulkan risiko terhadap keamanan lingkungan. Bioherbisida berbahan baku ekstrak Tetracera indica dan Cyperus rotundus diharapkan dapat menekan pertumbuhan gulma. Penelitian bertujuan untuk mengetahui keefektifan bioherbisida berbahan campuran ekstrak Tetracera indica (L.) Merr. dan Cyperus rotundus L. untuk mengendalikan gulma pada pertanaman kedelai. Percobaan disusun dalam Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal dengan tujuh perlakuan yaitu : tanpa penyiangan (P0), ekstrak T. Indica tunggal (P1), ekstrak T. Indica + C. rotundus dosis 45 kg ha-1 + 22,5 kg ha-1 (P2), ekstrak T. Indica + C. rotundus dosis 45 kg ha-1 + 45 kg ha-1 (P3), bahan T. Indica + C. rotundus dosis 22,5 kg ha-1 + 45 kg ha-1 (P4), ekstrak C. rotundus tunggal (P5), penyiangan manual (P6). Hasil penelitian menunjukkan bahwa aplikasi bioherbisida campuran T. indica dan C. rotundus dapat menekan gulma spesies Commelina diffusa dan Alternanthera sessilis (golongan daun lebar) serta spesies Rottboellia exaltata dan Paspalum conjugatum (golongan rumput), namun tidak efektif menekan gulma spesies Cyperus rotundus (golongan teki). Aplikasi bioherbisida campuran dapat menekan gulma lebih baik dibandingkan aplikasi bioherbisida berbahan tunggal. Aplikasi bioherbisida campuran Tetracera indica dan Cyperus rotundus tidak menyebabkan gejala fitotoksisitas terhadap tanaman kedelai. Kata kunci: bioherbisida, Cyperus rotundus, gulma, kedelai, Tetracera indica, One of the causes of decreased production in soybean crops is weed disturbance. Nowadays, weed control mostly carried out by manual control and using synthetic herbicides. The use of herbicides that are applied repeatedly and excessively causes damage to environment. Bioherbicides made from Tetracera indica and Cyperus rotundus extracts are expected to control weeds. This study was conducted to determine the effectiveness of mixed bioherbicide based on the extract of Tetracera indica (L.) Merr. and Cyperus rotundus L. in controlling weeds in soybean crops. The experiment was arranged in a single factor randomized complete block design (RKLT) with seven treatments: without weeding (P0), single T. indica extract (P1), T. indica + C. rotundus dose of 45 kg ha-1 + 22.5 kg ha-1 (P2), T. indica + C. rotundus dose of 45 kg ha-1 + 45 kg ha-1 (P3), T. indica + C. rotundus dose of 22.5 kg ha-1 + 45 kg ha-1 (P4), single C. rotundus extract (P5), manual weeding (P6). The results showed that the application of mixed bioherbicides with T. indica and C. rotundus could suppress Commelina diffusa and Alternanthera sessilis species (broad leaf group), Rottboellia exaltata and Paspalum conjugatum species (grass group), but it was not effective in suppressing Cyperus rotundus (sedges group). The application of mixed bioherbicide could suppress weeds better than the application of single-based bioherbicides. The application of a mixed bioherbicide from Tetracera indica and Cyperus rotundus did not cause phytotoxicity symptoms to soybean plants. Keywords: bioherbicides, Cyperus rotundus, Soybean, Tetracera indica, weeds
Keyword: bioherbicides, Cyperus rotundus, Soybean, Tetracera indica, weeds

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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