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: Pemanfaatan pupuk organik dan pupuk hayati dalam peningkatan produksi buncis mini dan perbaikan kualitas tanah
Abstrak: Conventional vegetable growers use only anorganic fertilizers. Using anorganic fertilizers only for long period of time, has negative impact on soil properties, hence soil degradation can not be avoided. Since the last few years, demand for healthy vegetable which is free from agrochemicals such as pesticide is increasing significantly. The objectives of the experiments were (i) to evaluate the effect of 3 kinds of organic fertilizers and 2 kinds of biofertilizers on vegetative growth and yield of french bean, (ii) to evaluate the effect of combination between organic fertilizer and biofertilizer at different rates of anorganic fertilizers on vegetative growth, yield of french bean and soil quality. This study consisted of two experiments. The first experiment was arranged on Randomized Complete Block Design with 2 factors, the first factor was organic fertilizer consisted of; chicken, goat, and cow manure. The second factor was biofertilizer consisted of: Control, Biost, Azozo. The result showed that the highest yield of french bean was achieved at chicken manure application produced greater in pod weight per plot 14.93% higher than goat manure and 23.66% than cow manure. The second experiment used Split Plot experiment that was arranged in Randomized Complete Block Design with 4 replications. Two applications the combination between organic fertilizer and biofertilizer as the main plot and 4 anorganic fertilizer rates 0%, 50%, 100% and 150% as sub plot. The result showed that the application between chicken manure and Azozo produced more pod weight per plot 58.9% higher than the application without the combination chicken manure and Azozo. Pod weight per plot from 50% rates of anorganic fertilizer produced 20.5% higher than 100% rates of anorganic fertilizer. Anorganic fertilizers can be substituted by organic fertilizers and biofertilizers for greater soil quality and sustainability of the crop productivity.
Keyword: 

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