Judul: Optimasi dosis nitrogen dan kalium pada bibit kelapa Sawit ( Elaeis guenensis Jacq) di Pembibitan Utama
Abstrak: The need of oil palm seedlings increase with the growing demand from farmers and plantation companies. The use of high quality seedlings is one of the requirements to obtain a high productivity. Thus the proper fertilization of seedlings planted at the main nursery should be done. This research aimed to determine the growth response of oil palm seedlings to various doses and to determine the optimum dose of nitrogen and potassium fertilizer on oil palm seedlings. The experiment was carried out at Cikabayan Experimental Station at IPB Darmaga Campus, Bogor, West Java. The experimental design used was factorial randomized block design with three replications. The treatment consisted of two factors, the first factor was N fertilizer and the second factor was K fertilizer. N fertilizer consists of four levels ( N1 = 0 g, N2 = 8.35 g, N3 = 16.7 and N4 = 33.4 g/seedling) and K fertilizer consists of four levels ( K1 = 0 g, K2 = 10.9 g , K3 = 21.8 g, and K4 = 43.6 g/seedling). The result of the experiment shows that N and K fertilizer increase the plant height, number of frond and stem diameter. Base on the plant height, the optimum dose of N fertilizer is 22.27 g and K fertilizer is 35.13 g during six months in the main nursery.
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Judul: Optimasi dosis pupuk nitrogen dan fosfor pada bibit kelapa sawit (Elaeis guineensis Jacq.) di pembibitan utama
Abstrak: The objective of this experiment was to study the optimum doses fertilizer of Nitrogen and Phosphorus for oil palm seedling (Elaeis guineensis Jacq.) in main nursery. This experiment was carried out at IPB Experimental Station (Plantation Teaching Farm),Cikabayan Dramaga, Bogor, from November 2011 to May 2012. The treatment was laid-out in a factorial randomized block design with three replications. The first factor was N i.e. 0, 8.51, 17.02, and 34.04 g N.plant-1 and the second was P i.e. 0, 2.28, 4.56 and 9.12 g P.plant-1. The result of the experiment showed that vegetative growth increased with fertilizer application. The height and leaf area of plant are affected by interaction between N and P significantly. The total leaf number and steam diameter increased quadratically with fertilizer rate of N and application of P increased linearly. Base on the height of plant and leaf number, optimum recommendation rate of N for oil palm seedling during six months in main nursery is 21.99 g N plant-1, by aplication every month i.e. 1.60, 1.14, 2.80, 4.01, 5.73 and 5.74 g N plant-1.month-1. Optimum recommendation rate of P is 4.24 g P plant-1 by aplication every month i.e. 0.22, 0.44, 0.76, 0.18, 0.94, and 1.70 g P.plant-1.month-1. The seedlings that resulted from experiment could be requisite accomplished to used on commercial planting.
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Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology