Judul: Nutrient status of N and K in maize (Zea mays) intercropping system in The Land of Immature Oil Palm area
Abstrak: The increase in oil palm’s cultivation area is inversely proportional to the food crop’s area in Indonesia. Decrease in cultivation area for food crops should be a concern in order to provide sufficient food and additional food production for Indonesian community. Optimizing in immature oil palm plantation by applying intercrop system between oil palm and seasonal crops such as maize can be a way to increase food crop’s cultivation area while providing additional production and income in the mean time until the main crop (oil palm) become mature and ready to harvest. The aim of this research is not only analyzing N and K effect on maize’s growth and production but also analyze the effect of maize intercropping on palm oil growth. This research was carried out at Cikabayan Experimental Station, IPB University August - December 2020 using one factor randomized complete block design (RCBD). The treatment consists of four level fertilizer application, namely A0 (without treatment), A1 (240 g Urea + 80 g KCl + 320 g SP-36 per plot), A2 (480 g Urea + 160 g KCl + 320 g SP-36 per plot), A3 (720 g Urea + 240 g KCl + 320 g SP-36 per plot). Results showed that application of A3 (720 g Urea + 240 g KCl + 320 g SP-36) per plot significantly affect the number of leaves, plant height, cob’s lenght, stem diameter, plant weight, cob’s weight and husk free cob’s weight. Intercrop system of maize on immature palm oil plantation doesn’t affect oil palm’s growth.
Keyword: intercropping, maize, nutrient content, oil palm, intercropping, maize, nutrient content, oil palm

Judul: Optimasi pemupukan nitrogen dan kalium terhadap tanaman kelapa sawit di pembibitan utama dan Tanaman Belum Menghasilkan (TBM)
Abstrak: The experiment consist of two experiment, the first experiment was optimizing of Nitrogen and Potassium fertilizer rate for oil palm seedling (Elaeis guineensis Jacq.) on main nursery; and the second experiment was optimizing of Nitrogen and Potassium fertilizers rate on immature plant of oil palm. The purpose of both experiments is to determine the optimum rate of Nitrogen and Potassium fertilizer. The experiment of optimizing Nitrogen and Potassium fertilizer rate for oil palm on main nursery aims to determine the optimum rate of nitrogen and potassium fertilizers was carried out at IPB Experimental Station (Plantation Teaching Farm), Cikabayan Dramaga, Bogor, from May to September 2012. The treatment was laid-out in a factorial randomized block design with three replications. The first factor N.i.e. 0, 25.92, 51.8, and 103.66 N plant-1 and the second was K.i.e 0, 26.99, 53.98 and 107.96 g K2O plant-1. The result of the experiment shows that Nitrogen and Potassium fertilizer increase the plant height, number of frond and stem diameter. Base on the plant height the optimum dose of Nitrogen fertilizer is 67.70 g and Potassium fertilizer is 86.68 during five months in the main nursery. The objectif of the experiment optimizing of Nitrogen and Potassium fertilizer rate for oil palm on immature was to determine the optimum rate of Nitrogen and Potassium fertilizers. Experiment was conducted at IPB Experimental Station (Plantation Teaching Farm), Singasari Jonggol, Bogor, from February to June 2013. The treatment was laid-out in a factorial randomized block design with three replications. The experiment was conducted in two trials, the first trial is made up of four Nitrogen fertilization levels N.i.e. 45, 90, 135, and 180 g N plant-1. The result shows that Nitrogen in immature increase 12.88 (cm month-1) of growth of the plant height, 3.75 (sheet month-1) of number of fronds, 3.46 (cm month-1 ) of stem girth and 3.16 (cm2 month-1 ) of leaflet area. The second is Potassium fertilization trial consist of four levels K.i.e. 30, 60, 90, dan 120 g K2O plant-1. The result shows that Potassium in immature increase 12.83 (cm month-1) of growth of the plant height, 3.61 (sheet month-1) of number of fronds, 4.03(cm month-1 ) of stem girth and 2.61 (cm2 month-1 ) of leaflet area.
Keyword: Potassium., Nitrogen, main nursery, optimizing fertilizer rate, oil palm seedling, oil palm immature plant

Judul: Penyelesaian Masalah Pelabelan Graf vertex Magic pada Graf Cycle Sederhana
Abstrak: Graf vertex magic adalah suatu graf memiliki nilai bilangan magic yang sama pada masing-masing vertex yang berbeda. Graf cycle sederhana adalah suatu walk tertutup yang mengandung setidaknya tiga vertex, semua vertex-nya berbeda dan setiap vertex terhubungkan oleh satu edge.
Keyword: