Judul: Pengaruh Media Tanam Organik Terhadap Pertumbuhan Dan Produksi Buncis Tegak (Phaseolus Vulgaris L.)
Abstrak: Media choising is one of important factor for the growth and production of erected kidney bean (Phaseolus vulgaris L.). Utilization the waste media of white oyster mushroom (Pleurotus ostreatus) and waste media of paddy straw mushroom (Volvariella volvaceae), cow manure, and rice husk as plant growth media for kidney bean can be used for optimizing the utilization of existing local resources and minimizing environmental damage as well as to support the codification of GAP (Good Agricultural Practices) of kidney bean. The research was done from February until October 2011 in experiment field at Leuwikopo, IPB, Bogor. The experiment arranged in one factor Randomized Complete Design with thirteen combinations from five kinds of organic media component, there were soil, waste media of white oyster mushroom, waste media of paddy straw mushroom, cow manure, and rice husk with 1:1 ratio (v/v). The kidney bean showed good responses to the combination media treatment, which were cow manure, combination of soil and waste media of paddy straw mushroom, combination of soil, waste media of paddy straw mushroom, and cow manure, and combination of soil, waste media of paddy straw mushroom, cow manure, and rice husk, but the best result of kidney bean production was given from waste media of paddy straw mushroom treatment.
Keyword: 

Judul: The Effect of the Type of Mulch and the Dosage of Goat Manure Compost on the Growth and Production of Green Beans (Phaseolus vulgaris L.)
Abstrak: Kebutuhan pangan khususnya kacang buncis di masa mendatang akan semakin meningkat, karena memiliki sumber protein nabati yang tinggi dan kaya akan vitamin sehingga banyak digemari masyarakat. Produktivitas kacang buncis masih mengalami fluktuasi setiap tahunnya. Hal ini terjadi karena penggunaan benih unggul yang belum merata dan teknik budidaya yang belum optimal. Penelitian ini bertujuan meningkatkan produktivitas kacang buncis melalui pemberian pupuk kompos kotoran kambing dan penggunaan mulsa pada taraf dan dosis pupuk yang tepat. Rancangan penelitian yang digunakan adalah Rancangan Kelompok Lengkap Teracak dengan dua faktor yaitu jenis mulsa dan dosis pupuk kompos kotoran kambing, setiap perlakuan terdiri dari 3 ulangan. Jenis mulsa berpengaruh nyata terhadap tinggi tanaman, diameter batang, jumlah daun, jumlah cabang, luas daun, bobot basah batang, bobot basah daun, bobot kering batang, bobot kering daun, jumlah polong per tanaman, panjang polong, bobot polong per tanaman, bobot polong per petak dan produktivitas tanaman. Perlakuan MPHP merupakan jenis mulsa terbaik dan efisien dalam meningkatkan pertumbuhan dan produksi tanaman. Dosis pupuk kompos kotoran kambing nyata dapat meningkatkan semua parameter pertumbuhan dan produksi tanaman kecuali bobot basah dan bobot kering akar. Terdapat interaksi antara jenis mulsa dan dosis pupuk kompos kotoran kambing terhadap bobot polong per tanaman, bobot polong per petak dan produktivitas tanaman. Perlakuan MPHP dengan dosis pupuk kompos 25 ton ha-1 nyata dapat meningkatkan 87,12% produktivitas buncis dibanding MPHP tanpa perlakuan pupuk. Dosis pupuk kompos optimal pada penggunaan MPHP yaitu 24,95 ton ha 1., The future demand for food, especially kidney beans, will continue to rise due to its high plant-based protein source and rich vitamin content, making it highly favored by the community. The productivity of kidney beans still experiences fluctuations every year. This occurs due to uneven distribution of superior seeds and suboptimal cultivation techniques. This study aimed to enhance kidney bean productivity through the application of goat manure compost fertilizer and the use of mulch at the appropriate level and dosage of fertilizer. The research design used was a Completely Randomized Group Design with two factors, namely, types of mulch and dosage of goat manure compost fertilizer. Each treatment consisted of 3 replications. The type of mulch significantly affected plant height, stem diameter, leaf count, branch count, leaf area, wet weight of stem, wet weight of leaves, dry weight of stem, dry weight of leaves, number of pods per plant, pod length, pod weight per plant, pod weight per plot, and plant productivity. The MPHP treatment proved to be the most effective and efficient mulch type in enhancing plant growth and production. The dosage of goat manure compost fertilizer significantly improved all growth and production parameters of the plants except for wet weight and dry weight of roots. There was an interaction between the type of mulch and the dosage of goat manure compost fertilizer concerning pod weight per plant, pod weight per plot, and plant productivity. MPHP treatment with a compost fertilizer dose of 25 tons per hectare can significantly increase 87,12% of chickpea productivity compared to MPHP without fertilizer treatment. The optimal dose of compost fertilizer in the use of MPHP is 24,95 tons per hectare.
Keyword: compost, organic mulch, synthetic mulch

Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix