Judul: Regression Analysis of The Effect of Nitrogen on Growth and Productivity of Sorghum bicollor L. Moench
Abstrak: Pertumbuhan sorgum yang optimal dapat dilakukan dengan pemberian dosis nitrogen yang tepat. Penelitian ini bertujuan untuk mengevaluasi perbedaan dosis nitrogen terhadap hasil pertumbuhan dan produktivitas tanaman sorgum. Pada 20 penelitian dari tahun 2006-2020 diperoleh 211 data perlakuan dan diinput dalam Microsoft Excel 2016. Data tersebut meliputi data pertumbuhan dan produksi yaitu umur panen, tinggi tanaman, jumlah daun, produksi bobot segar (BS), dan produksi bahan kering (BK). Kemudian data tersebut dianalisis menggunakan software IBM SPSS 26. Hasil penelitian menunjukkan bahwa penambahan dosis pupuk berpengaruh sangat nyata terhadap umur panen, peningkatan produksi bahan segar (p<0,01) dan penurunan produksi bahan kering secara nyata (p<0,01). tetapi tidak mempengaruhi jumlah daun dan tinggi tanaman (p>0,01)., Optimal growth of sorghum can be done by giving the right dose of nitrogen. The aim of this study was to evaluate differences in nitrogen dosing on growth yield and productivity of sorghum plants. A total of 20 studies from 2006-2020 obtained 211 treatment data and recorded in Microsoft Excel 2016. The data includes growth and production data, namely harvest age, plant height, number of leaves, production of fresh weight (BS), and production of dry matter (BK). Then the data were analyzed using IBM SPSS 26 software. The results showed that the addition of fertilizer doses, increased production of fresh matter (p<0.01) and significantly decreased dry matter production (p<0.01). but did not affect the number of leaves and plant height (p>0.01).
Keyword: fertilizer dosage, number of leave, plant height, sorghum (Sorghum bicollor L. Moench).

Judul: Growth and Production of Sorghum (Sorghum bicolor (L.) Moench) Varieties of Numbu at Various Doses and Placement of Fertilizers
Abstrak: Sorgum merupakan tanaman serealia dan berpotensi sebagai tanaman pangan alternatif, namun produktivitasnya masih rendah. Penelitian ini bertujuan untuk mengetahui dosis dan penempatan pupuk untuk meningkatkan pertumbuhan dan produksi tanaman sorgum. Penelitian ini dilaksanakan pada bulan Februari hingga Juli 2019 di Kebun Percobaan Cikabayan, Laboratorium Pengujian, dan Laboratorium Pasca Panen, Departemen Agronomi dan Hortikultura, Fakultas pertanian, IPB. Percobaan ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktorial. Faktor pertama adalah dosis pemupukan yang terdiri dari 25%, 50%, dan 100% dari dosis acuan yang digunakan (261 kg Urea, 100 kg SP-36, dan 150 kg KCl per hektar). Faktor kedua adalah penempatan pupuk yang terdiri dari (1) di sepanjang baris dalam di antara dua baris tanaman dan (2) di sepanjang baris di luar setiap baris tanaman. Pemberian dosis pupuk 25% dari dosis acuan meningkatkan pertumbuhan tinggi tanaman sorgum pada umur 8 dan 10 minggu setelah tanam dan menghasilkan hasil yang tidak nyata dibandingkan dosis lainnya. Penempatan pupuk tidak berpengaruh nyata terhadap pertumbuhan dan hasil sorgum., Sorghum is a cereal crop and has potential as an alternative food crop, but its productivity is still low. This research aimed to determine the dosage and placement of fertilizers to increase the growth and production of sorghum plants. This research was conducted from February to July 2019 at The Cikabayan Experimental Field Station, Testing Laboratory, and Post Harvest Laboratory, Departement of Agronomy and Horticulture, Faculty of Agriculture, IPB. The experiment used a factorial randomize complete block design (RCBD. The first factor was the fertilizer dose consisting of 25%, 50%, and 100% of the reference dose used (261 kg Urea, 100 kg SP-36, and 150 kg KCl per hectare). The second factor was the placement of fertilizers consisting of (1) along the row inside between two plant rows and (2) along the row outside each plant row. Giving a fertilizer dose of 25% of the reference dose increased the growth of sorghum plant height at 8 and 10 weeks after planting and resulted in a yield not significant to the others dose. The placement of fertilizer did not significantly affect the growth and result of the sorghum.
Keyword: dosage of fertilizers, growth, placement of fertilizer

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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