Judul: Pengaruh tebak baja terhadap sifat kimia tanah dan produksi padi sawah pada tanah gambut mukok, Sanggau
Abstrak: Utilization of peat lands as agricultural land especially for wetland rice Eeld faces some prob!ems such as low availability of macro and micro nutrients. Some research results indicated that the availability of silicate in p a t land of Kalimantan and Sumatra is low. The role of silicate oi, wetland rice are increasing the resistafice to lodging, pzst, and disease ss well as improving photosynthesis. This research were conducted ir two steps incubztio~a nd field experiment. In the two experiments, the dosage sf steel slag applied were : 3.0 , 2.5; 5.0; 7.5, and 10 ton /ha or eyuivclen? to 0,3.65,7.03, 11.03 and 14.70 g /kg for kcubation experiment. Result of incubztion experiment indicated that the effect of steel slag on chemical properties of soil were significant. The contents of exchangeable K, Ca and Mg; available Si, Fe, Mr., a~laC u; and soil pH were incresed with incresing the dgsage of steel slag. Results of field experiment indicated that application of steel slag as silicon fertilizer significantly incresed plant height, dry weight of total and filled spikelets; and decreased the percentage of unfillet spikellets. On the other land, the effect of steel slag treatments OI? number of inaximum and productive tilier rice werc not significant. The plant height, dry weight of total and filled spikelets were increased 14-22 %, 61-67 % and 65-96 %; respectively, with application of steel slag; and the percentage of unfilled spikelets was decreased 2.63-4.42 %.
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Judul: Pengaruh terak baja terhadap sifat kimia tanah dan produksi padi sawah pada tanah gambut Mukok, Sanggau
Abstrak: ta milik Pemanfaatan lahan gambut untuk pertanian terutama padi sawah dihadapkan pada beberapa masalah di antaranya adalah ketersediaan hara yang rendah, baik hara makro maupun mikro. Beberapa hasil penelitian menunjukkan bahwa pada tanah gambut Kalimantan dan Sumatra ketersediaan silikatnya rendah. Peranan silikat pada tanaman padi sawah adalah meningkatkan ketahanan terhadap kerchahan, meningkatkan ketahanan terhadap serangan hama dan penyakit, serta mendorong fotosintesis. Penelitian ini dilakukan dalam dua tahap yaitu percobaan inkubasi dan percobaan di lapangan. Dosis terak baja yang diberikan dalam percobaan inkubasi dan percobaan lapangan adalah 0.0, 2.5, 5.0, 7.5, dan 10 ton/ha atau setara dengan 0, 3.68, 7.03, 11.03 dan 14.70 g/kg untuk percobaan inkubasi. Hasil percobaan inkubasi menunjukkan bahwa pemberian terak baja berpengaruh nyata terhadap sifat kimia tanah. Kandungan basa-basa seperti K, Ca dan Mg dapat ditukar, Si, Fe, Mn, Cu tersedia dan pH tanah meningkat sejalan dengan meningkatnya dosis terak baja. Hasil percobaan lapangan menunjukkan bahwa pemberian terak baja sebagai sumber silikon nyata meningkatkan tinggi tanaman, bobot kering gabah total, bobot kering gabah bernas dan menurunkan persentase gabah hampa. Namun, tidak nyata pengaruhnya terhadap jumlah anakan maksimum dan jumlah anakan produktif. Tinggi tanaman, bobot kering gabah total, dan bobot kering gabah bernas meningkat berturut-turut 14-22 %, 61-87 %, dan 65-96% dengan pemberian terak baja, dan persentase gabah hampa menurun 2.63-4.42%.
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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