Judul: Side Effects of Isopropilamine Glyphosate Herbicide Used on Growth, Yield, and Residue of Maize
Abstrak: Maize is one of strategic cerealia in Indonesia. Increased of maize demand was a result of maize various function as feed, ingredient for food and drinks and raw material for alternative energy. A way to increase maize production is through amelioration of cultivation technique, for example by increasing production cost and labor efficiency through no tillage cultivation. No-tillage cultivation was identical with herbicide especially for weed control. The most common herbicide used is herbicide with Isopropilamine Glyphosate as active ingredient which is systemic, non-selective, pre-growth and broad spectrum control herbicide. Because of it’s non-seletive characteristic, IPA-Glyphosate herbicide use has potential to get into maize plant and affect its growth and yield. Also, absorption of IPA-Glyphosate has potential to form residue in the harvested yield. The objective of this research was to study the effect of IPA-Glyphosate herbicide on maize growth and yield. This experiments was conducted at Sindang Barang Farm IPB, Bogor from April to August 2013. The experiment used is a Randomized Block Design as experimental design with one factor, formulation of herbicide ith Isopropilamine Glyphosate as active ingredient. The experiment consisted of 5 treatments such as control, and herbicide with doses 3, 4, 5, and 6 l ha-1. Plot size was 4 m x 4 m, with plant spacing of 70 cm x 20 cm. Plots were treated on week before planting. Growth and yield of corn were influenced by herbicide treatments. Herbicide treatment at doses of 4 l ha-1 to produce seed growth, number of leaves, plant height, and leaf area the highest compared with other treatments. Similiar results also occur in the yield parameters of corn. Increased herbicide doses above 4 l ha-1 lower the better outcomes observed that variable growth and yield of corn. Based on glyphosate residue analysis indicated that each treatments contained residues of glyphosate. Herbicide treatment doses of 6 l ha-1 showed the highest residual value compared with other treatments. The Isopropilamine Glyphosate herbicide residue test result in this research were still under Maximum Limit of Residue.
Keyword: glyphosate residue, growth and yield of corn

Judul: Dampak Aplikasi Herbisida IPA Glifosat pada Pertanaman Padi Sawah Sistem TOT terhadap Tanah dan Tanaman Padi
Abstrak: Weeds are among factors in decreasing paddy production, therefore should be controlled. The effects of weeds in decreasing paddy ranging from 6-87%. Weed control is generally carried out chemically by using herbicides. The use of herbicide with active subtance glyphosate is very common in agricultural areas in the world. This herbicide is used for post-emergence of weeds and it is non-selective. Using herbicides to control weeds is more efficient, inexpensive, and faster. In fact, it is more practical and cost-saving because there is no need to hire many laborers to remove unwanted plants. Application of no-tillage technology (TOT) using herbicides is considered far more effective and efficient. However, continuous use of herbicides can result in residues in the soil, plants and harvest results. The objective of this study was to analyze the influence of TOT and its combination with Glyphosate IPA herbicide on paddy production and its economic value, and the concentration of the residues of Glyphosate IPA herbicide in soil, straw and rice, and the maximum residue limit. This research was carried out in the paddy field with a plot size of 3 by 3 m as many as 5 treatment plots with 3 replications in order to total 15 experimental plots. The tillage was not performed on the experimental plots, except on the 3 plots with Gm treatment where conventional tillage (OTS) as farmer habits in the field. The spraying of herbicide was done once before paddy planting by using herbicide with active glyphosate IPA on perfect tillage treatment (Gm), G0 (without herbicide, control), with a glyphosate dose of 1.5 l ha-1 (G1), 3 l ha-1 (G2) and 4.5 l ha-1 (G3). Application of herbicides was carried out by spraying on treatment plots, except the control plot, with the right dose which had been determined. Seeds were evenly spread using paddy seeds of Mekongga variety. The seedbed was adapted to the common treatment carried out by farmers. The seedlings are ready for planting at aged 25 days. The planting method was carried out by placing the seedling in a digged-hole (ditugal). The planting on conventional tillage (OTS) was performed as usual, without ditugal. Fertilization was done twice using urea fertilizer as much as 200 kg ha-1, SP36 100 kg ha-1 and NPK Phonska 100 kg ha-1. Chemical fertilization was done by distributing it evenly on paddy plants. Weeding was carried out 2 times on the plots of Gm treatment, that is, when the paddy was 30 days and 60 days after seedling planting. Harvesting was done at the age of ± 4 months in which ready-to-harvest paddy was yellow and the branches already bent. Harvesting was done on the sample plots observed by covering each plot with tiles measuring 1 m by 1 m. Harvesting on the sample plots was carried out with caution. The paddy grain samples of each treatment were taken and weighed. The straw and soil samples of each treatment were taken from the tiled plots. Herbicide residue tests were carried out on the three types of samples: soil, straw and rice (milled paddy). The sampling of
Keyword: Glyphosate herbicide, maximum residue limits, paddy, weed control

Judul: Teknik penentuan posisi bintang berdasarkan pelat foto overlapping
Abstrak: Bintang adalah salah satu objek langit yang menarik untuk diamati. Untuk itu, pengetahuan tentang posisi bintang sangat diperlukan. Posisi bintang di langit dapat dihitung melalui foto bintang. Fotografi astronomi atau astrometri merupakan ilmu yang mempelajari metode untuk menentukan posisi bendabenda langit seperti bintang berdasarkan pelat foto (Kamp, 1967). Sebuah pelat foto berisi citra bintang-bintang yang sudah diketahui posisinya berdasarkan katalog dan citra bintang-bintang yang belum diketahui posisinya. Posisi bintang yang ada di katalog dinyatakan dengan (a,3). Bintang yang belum diketahui posisinya lebih banyak jumlahnya daripada bintang yang sudah diketahui posisinya. Citra bintang pada pelat foto berupa sebuah titik dalam bentuk tetap. Posisinya pada pelat merupakan hasil pengukuran pada bidang kartesius dan dinyatakan dengan (1;,fl). Hasil pengukuran tersebut kemudian direduksi menjadi koordinat terukur (x,y). Hubungan antara (a,3) dan (x,y) didekati dengan sebuah deret dengan konstanta-konsranta deret merupakan konstanta pelat. Nilai konstanta pelat diperoleh dengan menggabungkan hasil pengukuran posisi bintang pada masing-masing pelat menjadi sebuah persamaan normal (Jefferys, 1963). Hasil akhir dari gugus persamaan normal tersebut dijabarkan dalam bentuk nOlasi matriks partisi dan berupa sebuah sistem persamaan linier Ax = b di mana A adalah matriks jarang, dan x merupakan konstanta pelar yang akan dicari nilainya. Untuk menyelesaikan sistem persamaan linier terse but digunakan metode transformasi given. Konstanta pelat yang sudah diperoleh dengan menyelesaikan sistem persamaan linier di atas, kemudian disubtitusi ke sebuah persamaan untuk memperoleh posisi bintang yang tidak tercantum dalam katalog. .
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