This research aims to determine the effect of combination of chicken manures and cow sheds to growth and production batu ijo shallot of varieties. The research was carried out in the field of Horticultural Seed Main Unit Kutagadung Berastagi, Berastagi District, Karo Regency, North Sumatra, in the elevation of ± 1,350 m above sea level. The research was conducted in June 2019 - August 2019. This research used the Non Factorial Randomized Block Design (RBD) method, was aplied: a combination of chicken manures and cow sheds, symbol (K): control (K0), 100% chicken coop (K1), 80% chicken coop + 20% cow shed (K2), 60% chicken coop + 40% cow shed (K3), 40% chicken coop + 60% cow shed (K4), 20% coop chicken + 80% cow shed (K5) and 100% cow shed (K6), seven treatments and four replications. Data obtained were performed analysis of variance with a F test of 5% level. The significant difference (p <0.05), results would be to the DMRT test. The results shownd that the treatment of the combination of chicken manure and cow shed had a significant effect (p <0.05) on the variable growth of plant height, number of leaves, number of tillers, number of tubers, tuber diameter, production per sample, and production per plot. Howere the highest average was found in the treatment of 100% chicken coops (K1) and followed the treatment of 100% cow pens (K6).

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).

Research to study the effect of a good combination of growing media and application of N fertilizer on the growth and yield of cauliflower (Brassica oleracea, L.). The research time was carried out from June 2022 to October 2022 at Raya Village garden, Berastagi District, Karo Regency, North Sumatra Province, with an altitude of 1,300 above sea level with latosol soil type and soil pH 6.8. This research was conducted from June 2022 to October 2022. This research was conducted with a factorial experiment of 3x2 = 6 + 1 controls arranged in a factorial randomized block design (RAK). The first factor was the composition of the planting medium (M), which consisted of 3 treatment levels, namely: Mo: Control (without mixture), M1: Soil + husk charcoal with a volume ratio (1:1), M2: Sand + charcoal husk with a volume ratio (1:1) , M3: Soil + sand + husk charcoal by volume ratio (1:1:1) . The second factor was the dose of ZA (N) fertilizer which consisted of 3 treatment levels, namely: N1 : 50 kg/ha, N2 : 100 kg/ha, N3 : 150 kg/ha . The observed variables were plant height, number of leaves, number of roots, fresh weight of plants, fresh weight of flowers/plant, dry weight of plants, initiation of flowering, flower diameter. Mixing plant media and N fertilizer can increase the growth and yield of cauliflower plants. M3N3 treatment ( Soil + sand + husk charcoal with volume ratio (1:1:1) + Nitrogen fertilizer 150 kg/ha, is the best treatment that can increase growth and yield of cauliflower on the number of roots (7.27 fruit), fresh weight of plants (7.95 g), dry weight of plants (2.69 g), initiation of flowering (6.00 hst), fresh weight of flowers/plant (6.98 g), flower diameter (3.09 mm).

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.

The research was carried out in the Tigapanah Village Farmers' field, Tigapanah Subdistrict, Karo Regency, from March to June 2016, where altitude was ± 1200 meters above sea level, Adosol land. The aim of the study was to determine the chicken manure dosage and the concentration of coconut water and its interaction with the growth and yield of Ercis plants (Pisumsativum L). Factorial Randomized Group Design (RBD) 4 levels, factor I: dose acquisition 1) without manure (control) 2) chicken manure 2) 200 g / plant, 3) 300 g / plant, 4) 400 g / plant (A0 , A1, A2, and A3). Factor II. Concentration of coconut water 4 level 1) 0 ml / plant, 2) 100 ml / plant, 3) 200 ml / plant, 4) 300 ml / plant (K0, K1, K2, K3). The results of the study showed that the effect of using chicken manure was significantly different (p ˃ 0.05) on the growth of plant height, number of branches, pods and weights of Ercis plants except that the age began to flower. Giving a dose of coconut water also gave a significantly different effect (p ˃ 0.05) on the growth of plant height, number of branches, production of pods and production weights except age began to flower. The interaction of doses of chicken manure and doses of coconut water did not have a significant effect on all observed parameters.