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.
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Judul: Respon Fisiologi Tanaman Jagung dan Cabai Terhadap Aplikasi Pupuk Organik yang Diperkaya dengan Pupuk Hayati pada Dua Lokasi Pengujian yang Berbeda.
Abstrak: It was known that biofertilizer can improve plant growth and production. The aim of this research was to study the influence of organic fertilizer enriched by biofertilizer on maize (Zea mays L.) and chili (Capsicum annum L.) planted in Bogor (West Java) and Kubu Raya (West Kalimantan). This research was conducted by using randomized block design with two factors. The first factor was the NPK fertilizer doses, which were 0%, 50%, and 100% of recommended dose. The second factor was different type of organic fertilizers, which were without compost, compost, and compost enriched with biofertilizer. Growth and production of both maize and chili increased in Kubu Raya as well as in Bogor. In combining with enriched compost, there was no significally different effect between NPK dose of 50% and 100%. The result showed that enriched compost was able to reduce the use of NPK fertilizer up to 50%. Production of maize in Kubu Raya was higher than that of in Bogor, while the chili production was higher in Bogor than that of Kubu Raya. Enriched compost affected leaf chlorophyll content of maize in Kubu Raya and Bogor, but it had no effect on vitamin C content of chili and total sugar content of maize planted in both locations.
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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