Judul: Pengaruh Pupuk Hayati dan Pupuk P terhadap Ketersediaan Fosfor dan Pertumbuhan Krisan (Chrysanthemum sp) di Tanah Regosol Cimacan
Abstrak: Phosphorus is a nutrient that is needed because it plays a role in plant seedling root growth, strengthening the growth of young plants to mature, accelerate flowering and ripening fruit, seed, or grain. But the availability of these elements in the soil is very low, and often comes in the form that is not available. Increased P-available needs to be done on soils that have a low fertility rate, One is ground Regosol Cimacan (PPT 1980). Various methods are used to increase the amount of nutrients in the regosol, such as the addition of biological fertilizer and inorganic fertilizer. The use biological fertilizers containing phosphate solvent microorganisms and the application of fertilizer P with a certain dose is needed to assist in increasing the phosphorus available to plants. One of the plants require phosphorus is Chrysanthemum (Chrysanthemum sp). The need of phosphorus for chrysanthemum is necessary for the flowering process. Chrysanthemum flower is known as a major cut flowers have high sales value. The purpose of this study was to determine the effect of biological fertilizer application and manure P for phosphorus availability and growth of chrysanthemum. Research isolation of microorganisms for biological fertilizer performed at the Laboratory of Soil Biotechnology and biological fertilizer application conducted in a plastic house "Pondok Adi Nursery". The study used a randomized block design with six treatments and five replications. The treatment used was 0 ml biological fertilizer + 0% P, 0 ml biological fertilizer + 50% P, 0 ml + 100% P, 50 ml biological fertilizer + 0% P, 50 ml biological fertilizer + 50% P, and 50 ml biological fertilizer + 100% P. Each treatment performed on cropping land area of 1 m2. The parameters observed were P-available, vegetative and generative plant growth and harvest quality. The results showed biological fertilizer and P Fertilizer is not effectively increase available P and plant vegetative growth, but significantly increased the growth of generative plants. Treatment of biological fertilizer 50 ml + 50% P real increase amount of will flower on 11 MST while treatment of biological fertilizer 50 ml + 100% P significantly increased yields at harvest stage 3. Thus the biological fertilizer and P fertilizer is not effectively increase P-available soil and vegetative growth of plants.
Keyword: 

Judul: Pengaruh Paclobutrazol terhadap pertumbuhan dan perkembangan dua varietas Chrysanthemum morifolium Ramat
Abstrak: Percobaan bertujuan untuk mengetahui pengaruh pembe- rian zat penghambat tumbuh paclobutrazol terhadap pertum- buhan dan perkembangan tanaman pot Chrysanthemum morifo- lium Ramat. Percobaan dilaksanakan di kebun pembibitan Inkarla Nursery, di daerah Cilember, Cipayung, Bogor. Bahan tanaman berupa stek pucuk krisan. Media pembibitan be- rupa pasir halus, sedangkan media tanam berupa campuran tanah dengan pupuk kandang dan pasir dengan perbandingan berdasarkan volume 1: 1: 1 dalam kantung plastik beru- kuran 20 x 30 cm. Percobaan menggunakan Rancangan Acak Lengkap yang terdiri atas dua faktor yang disusun secara faktorial dengan tiga ulangan. Faktor pertama yaitu dua varietas Chrysanthemum morifolium (Ivorylight' dan 'Bri- desmaid') dan faktor kedua paclobutrazol dengan lima taraf konsentrasi, yaitu 0.0 ppm, 2.5 ppm, 5.0 ppm, 7.5 ppm dan 10.0 ppm. Aplikasi paclobutrazol pada umur 3 MST melalui tanah (soil drench), Paclobutrazol tampak mempengaruhi pertumbuhan dan perkembangan tanaman krisan, terutama pada tinggi tanaman dengan penghambatan terbesar pada konsentrasi 5.0 ppm...
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