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: Pengaruh Kombinasi Kotoran Sapi, Pupuk Daun Silika, dan Pestisida terhadap Pertumbuhan dan Produksi Jagung (Zea mays) serta sifat Kimia Latosol, Dramaga
Abstrak: Maize is one of the agricultural crops that has similiar carbohydrate content with rice. The addition of foliar silica fertilizer is potential to prevent soil and water stress, pest attack, and to increase disease resistence as well as the growth and production of maize. This study was aimed to determine the effect of cow-dung manure, NPK fertilizer, foliar silica fertilizer and pesticides combinations on maize (Zea mays) growth and production and also on soil chemical properties of Latosol, Dramaga. The research was designed with randomized block design (RBD) with nine treatments and three replications. Treatment combinations was consisted of T0 (control), T1 (NPK), T2 (NPK + Foliar silica fertilizer), T3 (NPK + Pesticides), T4 (NPK + Foliar silica fertilizer + ½ Pesticides), T5 (Cow-dung manure + ½ NPK), T6 (Cow-dung manure + NPK + ½ Foliar silica fertilizer), T7 (Cow-dung manure + ½ NPK + pesticides), and T8 (Cow-dung manure + ½ NPK + Foliar silica fertilizers + ½ Pesticides). The results showed that generally cow-dung manure + ½ NPK (T5-T8) treatments indicated higher effect in promoting growth, nutrients uptake and corn cob production compared to treatments of NPK (T1-T4). The combination of NPK fertilizer, cowdung manure, foliar silica fertilizer and pesticides did not show significant effect statistically on soil total N, available P, and available Si. The exchangable potassium of soil tended to be higher in NPK combination (T1-T4) than cow-dung manure + ½ NPK combination (T5-T8). However, soil C-organic content in cowdung manure + ½ NPK combination (T5-T8) was higher than that in the NPK combination (T1-T4).
Keyword: Bogor Agricultural University (IPB), foliar silica fertilizer, cow-dung manure, maize

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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