Judul: The effect of competition on yield and its components in corn (Zea mays L.)
Abstrak: The phenotype of an organism is the expression of its genotype relative to the environment in which it develops. The increase in plant population, a general practice to Increase total yield, tends to suppress the potential expression of several plant charac- ters. It is of great importance to determine the stage of plant development in which these changes become permanent. The effect of competition stress was studied by thinning 32,000 plants/acre populations to 8,000 and 16,000 plants/acre at five stages of plant development, using six non-segregating popula- tions of corn. Most plant and ear characters were significantly influenced by stress in the period of rapid vegetative growth and after silking. Some attributes were able to recover considerably from retardations in early stages of plant development. Significant differences were observed between the two final plant populations, when population stress was decreased prior to silking. Observed yield losses were caused by increased barrenness and by decreased ear size as stress was maintained. The six genotypes showed different reactions to stress Hy2 x 0h07 proved to be the least affected hybrid and C103 and B37 germ plasm contributed to increased barrenness in the combinations used.
Keyword: Corn, Yield, Plant

Judul: Effect of Variety and Spacing Patterns on Growth and Production of Corn (Zea mays L.)
Abstrak: Jagung merupakan salah satu komoditas yang sangat penting di Indonesia. Produksi jagung di Indonesia belum dapat memenuhi kebutuhan nasional. Peningkatan produktivitas dapat dilakukan salah satunya dengan pengaturan jarak tanam dan pemilihan varietas yang tepat. Penelitian ini bertujuan untuk mengetahui pengaruh varietas dan pola jarak tanam yang berbeda serta interaksinya terhadap pertumbuhan dan produksi jagung. Perlakuan yang digunakan yaitu varietas yang terdiri dari varietas jagung hibrida Poneer 27 dan varietas jagung bersari bebas Bisma, dan jarak tanam yaitu jarak tanam jajar legowo sistem double row dan jarak tanam persegi yang masing-masing terdiri dari 2 taraf. Rancangan percobaan yang digunakan yaitu split-plot dengan rancangan lingkungan RKLT, yang diulang sebanyak 3 kali. Varietas jagung Pioneer 27 menunjukkan nilai rata-rata komponen hasil, hasil biji kering ubinan, dan produktivitas yang lebih tinggi (6,12 ton ha-1) dari Bisma (4,62 ton ha-1). Perlakuan jarak tanam tidak berpengaruh nyata terhadap peubah pertumbuah vegetatif tanaman, namun jarak tanam 80 cm × 25 cm menghasilkan bobot tongkol tanpa klobot dan bobot 1000 butir tertinggi. Rata-rata produktivitas dari semua jarak tanam adalah 5,37 ton ha-1., Corn is one of the most important commodities in Indonesia. Corn production in Indonesia has not been able to meet national needs. One of the ways to increase productivity is by setting the spacing and selecting the right varieties. This study aims to determine the effect of different varieties and spacing patterns and their interactions on maize growth and production. The treatments used were varieties consisting of Poneer 27 hybrid corn varieties and Bisma-free pollinated corn varieties, and the spacings were row spacing with double row system and square spacing, each consisting of 2 levels. The experimental design used was a split-plot with an RKLT environmental design, which was repeated 3 times. The Pioneer 27 maize variety showed a higher average yield component, dry grain yield, and productivity (6,12 ton ha-1) than Bisma (4,62 ton ha-1). Spacing treatment had no significant effect on plant vegetative growth variables, but 80 cm × 25 cm spacing resulted in the highest cob weight without cob and 1000 grain weight. The Pioneer 27 maize variety has a higher dry grain yield per tile and productivity than Bisma. The average productivity of all spacings is 5.37 tons ha-1.
Keyword: plant density, maize varieties, vegetative growth, yield components

Judul: Perancangan jalur interpretasi wisata sejarah kawasan kota tua Jakarta
Abstrak: Tapak perancangan berupa jalur interpretasi yang terletak di dalam wilayah administrasi kota Jakarta Barat dan melalui Jl. Stasiun, Jl. Pintu Besar Selatan dan Utara, Jl. Kali Besar timur dan barat, Jl. Cengkeh, Jl. Pos, dan Jl. Lada. Aksesibilitas menuju tapak mudah dengan berbagai alternatif sarana transportasi. Tata guna lahan kawasan 78% terdiri dari perkantoran perdagangan.
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