Penelitian ini dilaksanakan di Lahan Penelitian Fakultas Pertanian Universitas Quality Berastagi, Kecamatan Berastagi, Kabupaten Karo, Sumatera Utara, dengan ketinggian ±1250 – 1500 meter dari permukaan laut. Penelitian ini dilaksanakan pada bulan Oktober 2016 – Januari 2017. Dengan judul penelitian “Perubahan Pertumbuhan Dan Produksi Bawang Merah (Allium Ascalonicum L.) Dari Pengaruh Penggunaan Pupuk Organik Dan Dosis Pupuk KCl “. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) Faktorial dengan 2 faktor diujikan sekali gus. Faktor I : Dosis pemberian Kompos Asap dengan symbol “O” dengan taraf :O0 : Kontrol ( tanpa perlakuan ), O1 : 350 gram/ plot, O2 : 550 gram/ plot, O3 : 750 gram/ plot. Faktor II : Dosis pemberian Pupuk KCL dengan symbol “K” dengan taraf : K0 : Kontrol ( tanpa perlakuan ), K1 : 18 gram/ plot, K2 : 24 gram/ plot, K3 : 30 gram/ plot. Parameter yang diamati adalah Komponen pertumbuhan dan hasil tanaman bawang merah (Allium ascalonicum L.) yang diamati adalah : Tinggi Tanaman (cm), Berat Tanaman Sampel (g), Berat Tanaman /Plot (g). Berdasarkan hasil analisa dan uji beda rata-rata diperoleh pada berbeda nyata nyata (p > 0.05) terhadap tinggi tanaman, produksi (g/sampel) dan produksi (kg/plot) sedangkan jumlah daun berbeda tidak nyata (p > 0.05).

Telah dilakukan penelitian berjudul "Penggabungan Bahan Aktif Insektisida  dalam Pengendalian Hama Lalat Buah Pada Tanaman Jeruk (Citrus sinensis L.) Penelitian ini menggunakan rancangan acak (RAK) non faktorial dengan kombinasi obat, sebagai berikut; C1 = bahan aktif Fenvalerat 1,5 cc / liter air, C2 = bahan aktif Acephate 1 g / liter air, C3 = bahan aktif Cypermethrin 1,5 cc / liter air, C4 = bahan aktif Acephate + Fenvalerat + 2,5 cc / liter air, C5 = bahan aktif Cypermethrin + Fenvalerat + 2,5 cc / liter air, C6 = bahan aktif Cypermethrin + acephate + 2,5 cc / liter air, C7 = bahan aktif Acephate + Fenvalerat + Cypermethrin 3,5 cc / liter air. Hasil penelitian menunjukkan bahwa campuran 3 jenis bahan aktif insektisida dapat menekan persentase serangan lalat buah sehingga dapat menyelamatkan buah untuk produksi yang lebih tinggi.

This reserch aims to determine the effect of comparison of planting media and and growth regulator concentration on the growth and propagation of G-0 Potato seeds. This research was carried out in the Screen house of the Raya Village garden, Berastagi District, Karo Regency, North Sumatra Province, with a place of ± 1,300 m asl. This research was carried out from January to April 2019. This reserch used the Factorial Randomized Block Design method of two treatment factors, namely the comparison treatment of planting media with the symbol "M" which consists of five levels, namely: without compost (M0 ), 30% compost (M1), 50% compost (M2), 70% compost (M3), and 100% compost (M4). The second factor was giving a growth regulator concentration with the symbol "Z" which consists of three levels, namely: without concentration (Z0), 1.5 ml /L (Z1), and 3 ml / L (Z2). So that 15 treatment combinations were obtained, each treatment was repeated 3 times. The results of the observational data were then analyzed for variance with an F level of 5%. If there is a significant difference (p <0.05), then the test is continued with the Duncan test. The results showed that the treatment comparison of the planting media had a significant effect (p <0.05) on the variable growth in plant height, development of stem diameter, production each sample, and production each plot, and had no significant effect (p> 0.05) on number of branch. The treatment of growth regulator concentration had a significant effect (p <0.05) on production variables each sample, and production each plot, and had no significant effect (p> 0.05) on variable growth in plant height, development of stem diameter, and number of branch.

This study aims to determine the ZPT and POC intractions that can affect the growth and production of onion plants. This reserch was carried out in Gurubenua Village, Munte District, Karo Regency, Nourth Sumatra, with a height of ±1175-1350 meters above sea level. This research was conducted from June 2019 to September 2019, using the Factorial Randomized Block Design (RBD) method consisting of two regulatory factors, the first dose of ZPT with symbol A consisting of 4 levels, namely: No dosing (A0), 0,75ml/ liter of water (A1), 1,5ml/ liter of water (A2), and 2,25ml/ liter of water (A3). Second is the POC dose with the symbol P consisting of 4 levels, namely: Without dosing (P0), 1,5ml/ liter of water (P1), 3ml/ liter of water (P2), and 4,5ml/ liter of water (P3). Approved, 16 preparations were obtained, with two replications. The data analyzed the F test variance at the 5% level. If there is a significant difference (p˂0.05), then try to continue with the DMRT test. The results of the studyprove the need for a real implementation of ZPT (p˂0.005) for height plant variables per sample, number of leaves per plotand number of tubers per plot, and not significant (p˃0.005) for variable measurements of tuber diameter per sample, plant weight per sample and plant weight per plot. The treatment of submitting POC must be real (p˂0.005) of the plant height variable per sample, number of leaves per sample, number of tubers per sample, and plant weight per sample and not significant (p˃0.005) to the variable influence of tuber diameter per sample and plant weight per plot.

This study aims to determine the effect of the number of tubers / kg of seeds and the dose of biological liquid fertilizer on the growth and production of potato plants. The research was carried out at the Quality University Experimental Garden in Karo District at + 2140 m asl which was conducted from June 2017 - September 2017. This study used Factorial Randomized Group Design with two treatment factors. The first factor is the size of seed bulbs with four levels, namely: 7 tubers / kg (P1); 14 tubers / kg (P2) and 21 tubers / kg (P3), and the second factor is the liquid fertilizer dosage with four levels: 0.0 ml / l water (Ho); 0.2 ml / l water (H1); 0.4 ml / l water (H2); 0.8 ml / l water (H3). The results showed that the treatment of tuber size as seeds significantly affected the number of tubers / samples of production / samples, production / plots, but not significantly different for plant height, number of branches. The treatment of biological liquid fertilizer doses significantly affected plant height, tuber / sample number, production / sample, production / plot. But it was not significant for the number of branches. The interaction between the two treatment factors did not significantly affect all parameters observed throughout the study.