Judul: Factorial effect on matter accumulation and chemical characteristics, and related characters in cassava (Manihot esculenta Crantz)
Abstrak: his study was carried out to anaJyze varietal differences on matter accumulation and chemical characteristics, and to screen the relationship of major growth characters with DM accumulation and chemical constituents in 4 varieties of cassava. The sweet varieties developed a sufficient source and canopy in short period at the early growth phase and then translocated assimilates to storage roots with a higher partitioning rate, even these varieties were considered as early-maturing varieties from the standpoint of the accumulation rates of STC and DM in roots. Moreover. the sweet varieties showed early-bulking characteristics having superior source and sink potentials for the increase of DWR and accumulation of DM in roots. The direct effects of TDW, R/SR, and LAI on the DWR were higher, while the R/SR, mw, DWL, and LAI showed higher direct effects on the STC. These characters were considered to be useful target characters to screen cassava varieties with higher tuber yield and STC. The HCNL and HCNR began to decrease after 5-7 and 3 MAP, respectively, except for Pucuk Biro showing a delayed accumulation of HCNR until 7 MAP. The HCNL showed relatively higher positive correlation (r=0.639) with the HC which was highly affected by NL, LAI, OWL, and LAD. The LAI, DWR, and STC gave higher negative direct effects on the HCNL and HCNR. At the harvest time, Gading was coosidered to be sweet with 5.8 mg HCNR 0 g-1 fresh weight, while Adiral seemed to be intermediate, containing 17.0 mg HCNR
Keyword: cassava, varieties, germplasm, fertilization, toxicity

Judul: Factorial Effect On Matter Accumulation and Chemical Characteristics, and Related Characters in Cassava (Manihot esculenta Crantz), Efek faktorial terhahap akumulasi bahan kering dan karakteristik kimiawi, serta karakter terkait pada ubi kayu (Manihot esculente Crantz)
Abstrak: This study was conducted to analyze varietal differences on dry matter (DM) accumulation and chemical characteristics, to screen the relationship of DM production and accumulation-related major growth characters with major chemical constituents, end to observe the effect of stemcutting or potassium (KCl) treatments on major growth of charactem and chemical constituents in sweet and bitter varieties of cassava (Mamihot esculenta Crantz) from May 2001 to September 2004 in Cibinong, Bogor, West Java., Penelitian ini terdiri dari 3 percobaan, yaitu: (1) mempelajari perbedaan varietas terhadap akumulasi bahan kering (DM) dan karakteristik kimiawi, serta hubungan karakter pertumbuhan utama yang berkaitan dengan akumulasi dan produksi DM dengan komponen kimiawi penting; (2) mempelajari pengaruh perlakuan panjang dan bagian setek (SC) terhadap akumulasi dan produksi DM; (3) mempelajari pengaruh dosis pemupukan kalium (KCl) terhadap karakter pertumbuhan dan komponen kimiawi utama pada varietas manis dan pahit. Penelitian dilaksanakan dari Mei 2001 sampai September 2004 di Cibinong, Bogor, Jawa Barat.
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Judul: Reduksi Reverberasi dengan Narrow Beam Receiver pada Sonar untuk Akurasi Interpretasi Target
Abstrak: Salah satu pembatas utama dalam pendeteksian kelompok ikan adalah reverberasi. Reverberasi dapat sebagian menutupi sinyal echo (echo ikan) sehingga menyyulitkan, kadang tidak memungkinkan penerimaan sinyal. Penutupan sinyal ini terjadi jika besarnya penerimaan sinyal echo lebih kecil daripada peringkat reverberasi pada waktu dan jarak tertentu.
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