Judul: Effect of Crossing on Physiological Quality of Hybrid Corn (Zea mays L.) Seed
Abstrak: Seed physiological quality is an important factor in farmer acceptance of a hybrid variety. High physiological quality can be an added value to agronomic advantage of hybrid variety that consist of single cross, double cross, and three-way cross. The aim of this research was to investigate whether type of crossing affect the physiological quality of the hybrid corn seed. Four corn purelines each of high germination lines (BS07 and BS30) and low germination lines (BS32 and BS50) was planted. Completely randomized design with four replications was employed to perform 2 double cross, 8 three-way cross, and 10 single cross. Seed physiological quality was evaluated based on vigor index, germination percentage, storability, germination speed, uniformity of germination, ten normal seedlings dry weight, plumule length, primary root length, and number of seminal root. T-student and analysis of varians were used to analize the effect of maternal and crossing type on physiological quality of produced hybrid seed. The results showed that the maternal effect on physiological quality was depended on parents combination. Storability, ten normal seedlings dry weight, and primary root length were not affected by maternal effect, whereas other variables were affected on at least a pair of parents. Parent seed physiological quality significantly affected to its hybrid seed physiological quality. The effect was present on single cross and three-way cross hybrids. Low physiological quality seed parent produced low physiological quality hybrid seed. In single cross, crossing of two high physiological quality parents or crossing of high and low quality parents produced high physiological quality hybrid seeds. However, crossing of two low physiological quality parents produced low physiological hybrid seed. In three-way cross, crossing of parents that consist of at least one high physiological quality line produced a higher physiological quality hybrid seed than hybrid seed of three low physiological quality parents. In double cross, crossing of high and low physiological quality F1 parents with its reciprocal crossing produced not different physiological quality hybrid seed.
Keyword: double cross, pureline, single cross, three-way cross, vigor

Judul: Peningkatan Produksi Benih Jagung Hibrida melalui Optimalisasi Populasi dan Rasio Tetua Jantan Betina
Abstrak: Attempts to increase seed yield of hybrid corn has been done, but the results have not been satisfactorily achieved. Researches should be done in various aspects such as row ratio of parents, planting density, optimum days to harvest and influence of climatic factors (sunlight and rainfall), season and agroecology. The aim of study are to obtain optimum plant population and rasio of male to female parents for increasing seed yield of hybrid corn and to study seed quality of Bima 3 and STJ-01 varieties. The seeds used in the research were parents of Bima 3 (Nei90008 line as female, Mr14 line as male) and STJ-01 (Bima 5 variety as female, Nei9008 line as male). The experiment was arranged in a randomized complete block design with two factors and three replications (replications was nested in factor of parent ratio). The first factor was male to female parent ratio (1:4, 1:5 and 2:6) and the second factor was plant population (66 667 plants/ha, 83 333 plants/ha and 90 000 plants/ha). Combined analysis of variance was performed to understand the effects of both factors and their interactions. The results showed that plant population did not significantly affect plant height of Bima 3 and STJ-01 parents, ear height of Bima 3 and STJ-01 female parents, leaf area index of STJ-01 female parent, number of ear of Bima 3 female parent, ear weight of Bima 3, and seed yield of Bima3 and STJ-01. The effect of parents ratio was significant for seed yield of Bima 3 and STJ-01. The highest seed yield of Bima 3 variety was achieved at parent ratio 1: 5 (1.43 tons/ha) and the highest seed yield of STJ-01 was achieved at parent ratio 1:4 (3 tons/ha). Seed quality of Bima 3 variety was better than that of STJ-01. The seedling growth of Bima 3 was more simultaneous more tolerant to drought based on germination percentage and speed of germination and more tolerant to salinity based on the number of green leaves.
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Judul: Perencanan Lanskap Sunda Kalapa, Jakarta Utara Sebagai Kawasan W isata Sejarah
Abstrak: Perkembangan kota Jakarta dari waktu ke waktu sangatlah cepat, sehingga menyebabkan kota-kota tua banyak yang tergusur untuk dijadikan daerah baru yang lebih modern. Apabila hal tersebut tidak ditanggulangi secara dini maka keberadaan Kota Lama Jakarta akan hilang. Hal inilah yang melatar belakang untuk dilakukan tindakan perlindungan dan revitalisasi kawasan bersejarah Sunda Kalapa.
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