Judul: Pengaruh dosis pupuk p dan k terhadap pertumbuhan dan pembungaan bunga potong gerbera (Gerbera jamsonii)
Abstrak: Percobaan ini bertujuan untuk mengetahui pengaruh pemberian berbagai dosis pupuk fosfor dan kalium serta interaksinya terhadap pertumbuhan dan pembungaan tanaman gerbera. Percobaan menggunakan Rancangan Acak Kelompok (RAK) yang disusun secara faktorial terdiri atas 2 faktor dan 3 ulangan. Faktor pertama adalah pemupukan fosfor yang terdiri dari 3 taraf yaitu 0, 250 dan 500 ppm P205 per tanaman. Faktor yang kedua adalah pemupukan kalium terdiri dari 3 taraf yaitu 0, 200 dan 400 ppm K20 per tanaman. Peubah pertumbuhan vegetatif tanaman yang diamati meliputi jumlah daun dan luas daun. Sedangkan peubah pertumbuhan generatif meliputi saat inisiasi bunga pertama, jumlah bunga per tanaman, kualitas bunga (panjang tangkai bunga, diameter tangkai bunga, diameter bunga dan masa segar bu- nga), bobot kering bagian-bagian tanaman (akar, batang, daun dan bunga), serta kadar P dan kadar K dalam daun. Pemupukan fosfor hingga dosis 500 ppm P205 per tanaman dan pemupukan kalium hingga dosis 400 ppm K20 per tanaman secara umum belum memberikan pengaruhnya terhadap pertumbuhan vegetatif maupun pertumbuhan generatif tanaman gerbera. Meskipun demikian pemupukan fosfor berpengaruh terhadap luas daun pada umur 28 MST dan kadar hara K dalam daun. Sedangkan pemupukan K berpengaruh terhadap saat inisiasi bunga pertama dan panjang tangkai bunga. Tidak terdapat interaksi antara pemberian pupuk fos- for dengan kalium terhadap pertumbuhan vegetatif maupun pertumbuhan generatif tanaman gerbera, kecuali untuk jum- lah bunga per tanaman…
Keyword: 

Judul: Uji Efektivitas Penambahan Beberapa Jenis Pupuk Organik Terhadap Pertumbuhan Dan Pembungaan Bunga Potong Gerbera (Gerbera Jamesonii) Var. Red Ruby
Abstrak: The research aimed to study the effectiveness of addition some types of organic fertilizers on growth and flowering of Gerbera (Gerbera jamesonii) cut flower var. Red Ruby. This research was conducted from March 2010 to December 2010 at Balai Penelitian Tanaman Hias (BALITHI) Segunung, West Java. This research was used single factor treatment that arranged in randomized block design enviroment. Organic fertilizers was used consist of three types (chicken manure, goat manure, and green manure). The treatments were administered in the form of top soil volume ratio with certain type of organic fertilizers. The result showed that addition some type of organic fertilizers are not significantly affected to some variable (the number of sucker, the lenght and width of leaves, leaf dry weight, the number of flower, stalk flower diameter, vase life of flower). The addition of green manure with volume ratio of 1:1 and 1:3 increases the amount of leaf growth. The addition of chicken manure with volume ratio of 1:2 increases flower diameter while long stalk flower increased by addition chicken manure at volume ratio of 1:1. Treament with addition goat manure at volume ratio 1:1 showed the fastest of initiation time in flowering.
Keyword: 

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: