Judul: Pengaruh Pohon Induk dan Pupuk NPK terhadap Pertumbuhan Semai Khaya (Khaya anthoteca C.DC) di Persemaian
Abstrak: Khaya is one of the important tree species planted for National Movement for Land and Forest Rehabilitation based on Ministry of Forestry Decree no. 159/Kpts-II/2003. Khaya has been widely investigated in terms of generative and vegetative propagation. However, the fertilizer effect on Khaya seems to get less attention. Therefore, research about the effect of fertilizer on Khaya will be important especially if the seeds were harvested from a high quality mother trees. The objective of this research is to find out the appropriate dosage of NPK fertilizer to promote the growth of khaya seedings originated from 3 mother tree and its interactions.
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Judul: Kajian Hasil-Hasil Penelitian tentang Respon Pemberian Pupuk NPK terhadap Pertumbuhan Berbagai Semai dan Bibit Tanaman Kehutanan
Abstrak: The reforestation program is currently intensively implemented in Indonesia. However, its success rate is low. This is because most of the lands are of poor soil having lack of humus. One effort to increase the success of the program is the supply of quality seeds and fertilization. Collecting the results of research on the application of NPK fertilizer to forest plants is needed to determine the effectiveness of fertilizer on the plant growth. This study was done by collecting and analyzing the results of the research on the effect of NPK fertilizer on the growth of various forestry seedlings. The research data was taken from the library of the Forestry Faculty, Bogor Main Library (LSI) of Bogor Agricultural University, and Ardi Koesoema Library of R.I (the republic of Indonesia). Interviews were also conducted with the farmers of forest plant nursery as well as forestry researchers to collect the data. Forest plant species observed were Shorea ovalis, Dipterocarpus hasseltii, Paraserianthes falcataria, Khaya anthoteca, Anthocephalus cadamba, Acacia mangium, Eugenia polyantha, Gmelina arborea, Maesopsis eminii, Enterolobium cyclocarpum, Swietenia macrophylla, Agathis lorantifolia, and Toona sureni. The research results showed that NPK fertilizer could improve the quality of forest seedlings in the nursery. In addition, NPK fertilizer can improve the growth rate of seedlings planted on gold tailing and field. The result of the interview showed that some farmers used NPK on the nursery. The decision whether or not to use such fertilizer was based on the calculation of economic value and the experience of farmer. On the ather hand, the researchers viewed that fertilization should be done to help the soil providing complete and balanced nutrients for the plants to grow.
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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