Karakterisasi Beberapa Sifat Kuantitatif Plasma Nutfah Gandum (Triticum Aestivum. L)

The aim of the experiment were to rejuvenate and characterize of wheat germplasm. Eighty nine genotypes planted at Kuningan Field Research Instalation, West Java from June to October 2002. Plot size for each genotypes 3 x 1 m2 with spacing 25 x 10 cm. Seeds were planted with 2 seed per hole and thinned out to one plant. Several agronomic characters were observed: date of flowering, date of maturing, plant height, number of productive tiller per hill, seed weight per hill and yield per plot. The results showed that: date of flowering (mean 60.9 days with range 48-77 days), date of maturity (mean 102.7 days with range 87-119 days), plant height (mean 72.4 cm, range 53.5-88.7 cm), number of productive tiller per hill (mean 9.71, range 4.9-24.0), seed weight per hill (mean 11.96 g, range 5.3-34.5 g) and seed yield per plot (200.0- 2624.5 g). Seventeen genotypes have date of flowering <54.3 days, some of them were H40, H80, V219, and V132. There were 25 genotypes have date of harvesting ranged 87-98 days, some of them were H40 (87 days), H85 (91 days), H90 (91 days). There were 16 genotypes have plant height <65.2 cm, some of them were C3 (53.5 cm), C7 (58.4 cm), C14 (59.1 cm). Whereas the highest was C10 (88.7 cm). Nine genotypes have number of productive tiller per hill >17.5, some of them were C8 (23.6), C27 (22.7) and the greatest number was C28 (24.0). Sixty six genotypes have number of productive tiller per hill, ranged 4.9-11.2, some of them were: C34 (4.9), C24 (5.2), H85 (5.6). Seed weight per hill showed that 60 genotypes have seed weight <12.6 g, for example: H71 (5.3 g), H40 (6.6 g), C132 (5,4 g), C34 (6,7 g), whereas the heaviest was C28 (34.5 g). Sixteen three two genotypes that have yield per plot >2000 g were V192 (2016.0 g), and V167 (2624.5 g)

Plasma Nutfah Jagung Sebagai Sumber Gen Dalam Program Pemuliaan

In December 2005, maize germplasm collection at the institute were 886 accessions consisted of 581 local varieties, 165 introduced varieties, 107 inbred, lines, and 33 old and the present improved varieties. Required traits in varietal improvement or development are drought tolerant, tolerant to Al-toxicity, early maturity, have better quality, resistant to downy mildew disease, resistant to insect Atherigona exigua and high yield. Maize germplasm must be characterized accordingly. Evaluation for Al toxicity was conducted at Tamanbogo, Lampung, 100-200 accessions of maize germplasm and tolerance to drought were conducted in Jakenan and Imogiri Central Java, 63-100 accessions. Evaluation for downy mildew resistance was conducted at Cikeumeuh Bogor, 100-200 accessions. Evaluation for resistance to seedingfly was conducted at Cikeumeuh, 75-100 accessions. The results of evaluation conducted from 1999-2004 were: 30 accessions tolerant to drought, 21 accessions. tolerant to Al-toxicity, 70 accessions resistant to downy mildew disease (Peronosclerospora maydis), 22 accessions resistant to seeding fly (Atherigona exigua), 126 accessions had very early maturity <80 days (consisted of 31 accessions had yellow seed, 35 accessions had white seed, and 60 accessions had other colour seed). Accessions having good characters, need to be further tested prior to their use in the breeding program, particularly the accessions resistant to Atherigona exigua in monoculture test

Problem Based Instruction Berbantuan E-Learning : Pengaruhnya terhadap Kemampuan Berpikir Kritis Peserta Didik Sekolah Dasar

Kemampuan berpikir kritis merupakan bagian dari keterampilan abad 21 yang harus diasah dan dikembangkan bagi peserta didik melalui proses pembelajaran, termasuk pembelajaran di Sekolah Dasar. Tantangan yang dialami adalah bagaimana mengasah kemampuan berpikir kritis siswa melalui pembelajaran daring di masa pandemi covid-19. Penelitian ini memiliki tujuan untuk mengetahui penerapan Problem Based Instruction berbantuan e-learning dan pengaruhnya terhadap kemampuan berpikir kritis peserta didik di Sekolah Dasar. Penelitian ini dilaksanakan di SDN Jatisampurna X Bekasi. Penelitian ini merupakan penelitian eksperimen. Desain penelitian ini berupa Pre-Experimental berupa One Group Pretest Posttest. Teknik pengambilan sampel penelitian ini adalah sampel jenuh. Jumlah sampel yang digunakan sebanyak 27 peserta didik kelas V. Teknik pengumpulan data dilakukan melalui tes tertulis berbentuk uraian. Teknik analisis data yang dipergunakan penelitian ini berupa uji-t. Berdasarkan hasil uji t, diperoleh bahwa t_(hitung =) 9,62>t_tabel= 1,70 , maka terdapat pengaruh penerapan Problem Based Instruction melalui e-learning terhadap kemampuan berpikir peserta didik. Selain itu, penelitian ini menunjukkan bahwa kemampuan peserta didik dalam memberi penjelasan meningkat hingga 61%, kemampuan mmebangun keterampilan dasar meningkat hingga 64%, kammpuan melakukan inferensi meningkat sebesar 70%, kemampuan peserta didik dalam memberi penjelasan leih lanjut juga meningkat hingga 95%, serta kemampuan dalam melakukan pengaturan strategi dan taktik meningkat hingga 93%