Judul: The Quality of Sorghum caudatum Forage and Grain as Feed by Organic Fertilizing and Legumes Intercropping.
Abstrak: Sorghum is a high potential plant for food and feed. Sorghum cultivation is easier than some other cereal crops because it can stand in dry condition. Its chemical composition is good so that it can be used as alternative food or feed. The increased of sorghum production and quality can be done by improving soil fertility especially by organic fertilizing and legume intercropping. The purpose of this experiment is to evaluate the effect of organic fertilizer and legumes intercropping on sorghum quality
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Judul: Growth and Production of Sorghum Post Peanut Planting
Abstrak: Sorgum merupakan komoditas pangan bernilai ekonomi tinggi dan berpotensi dikembangkan di Indonesia. Produktivitas sorgum dapat ditingkatkan dengan menerapkan sistem budi daya yang baik, salah satunya rotasi tanaman dengan kacang-kacangan. Penelitian ini bertujuan menganalisis pertumbuhan dan produksi sorgum di lahan pasca penanaman kacang tanah serta menganalisis pengaruh pemupukan terhadap pertumbuhan dan produksi sorgum di lahan pasca penanaman kacang tanah. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) pola tersarang (nested) dengan 2 faktor dan 4 ulangan. Faktor pertama yaitu jenis lahan (lahan non-pasca penanaman kacang tanah dan lahan pasca penanaman kacang tanah). Faktor kedua yaitu pemupukan (tanpa pupuk, pupuk anorganik, dan pupuk anorganik + pupuk kandang). Terdapat interaksi antara jenis lahan dan pemupukan terhadap diameter batang dan panjang malai. Penggunaan lahan pasca penanaman kacang tanah memberikan pertumbuhan dan komponen hasil sorgum yang lebih baik pada karakter jumlah daun, diameter batang, intensitas hijau daun, panjang daun, lebar daun, panjang malai, diameter malai, bobot basah malai, bobot basah brangkasan, dan bobot kering brangkasan. Pupuk anorganik maupun pupuk anorganik + pupuk kandang meningkatkan tinggi tanaman, jumlah daun, dan diameter batang. Pemupukan tidak meningkatkan komponen hasil sorgum., Sorghum is a food commodity that has high economic value and potential to be developed in Indonesia. Sorghum productivity can be increased by implementing a good cultivation system, such as crop rotation with legumes. The study aims to analyze the growth and production of sorghum on post peanut planting land and analyze the effect of fertilization on the growth and production of sorghum on post peanut planting land. The study used a nested randomized complete block design (RCBD) with 2 factors and 4 replications. The first factor was the type of land (not post peanut planting land and post peanut planting land). The second factor was fertilization (no fertilizer, inorganic fertilizer, and inorganic fertilizer + manure). There was an interaction between land type and fertilization on stem diameter and panicle length. The use of post peanut planting land provided better growth and yield of sorghum in terms of leaf number, stem diameter, leaf green intensity, leaf length, leaf width, panicle length, panicle diameter, panicle wet weight, stover wet weight, and stover dry weight. Inorganic fertilizer and inorganic fertilizer + manure increased plant height, leaf number, and stem diameter. Fertilization did not increase the yield of sorghum.
Keyword: nested, legume, crop rotation, Bioguma 1

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