76 research outputs found
Short Communication: preharvest drought stress varies grain physical characteristics, milling percentage, and nutritional quality of two Job’s tears varieties
No full textWicaksono FY, Suganda TW, Wuminta, Sinniah UR, Yuwariah Y, Nurmala T. 2022. Short Communication: Preharvest drought stress varies grain physical characteristics, milling percentage, and nutritional quality of two Job’s tears varieties. Biodiversitas 23: 1443-1448. Preharvest drought stress is one of the limiting factors that may affect the quality of the harvested yield. This study aimed to evaluate the grain physical characteristics, milling percentage, and nutritional quality of two varieties of Job’s tears (Coix lacryma-jobi L.) in response to preharvest drought stress. Two varieties of Job’s tears were used in the present study, namely ma-yuen (cultivar Watani Wado)and stenocarpa (cultivar Watani Kiara Payung) at Ciparanje research station (6.9164° S, 107.7717° E) from July 2018 (dry season) to January 2019 (rainy season). A water-sufficient condition was achieved by irrigating the plant once a day, while a water-deficient condition was formed by the irrigation every 3 days using a sprinkler system.
The results showed that preharvest drought stress caused a significant reduction of seed size in both varieties. However, the stenocarpa was the only one with a significant reduction in milling yield due to its long seed length. In terms of nutritional quality, ma-yuen showed no significant response to preharvest drought, while stenocarpa showeda significant gain in protein and calcium. This finding opened the high potential of stenocarpa variety to be used both as an ornament, just like recent usage, and also functional food
Komposisi Gulma pada Berbagai Jarak Tanam Padi Secara IPAT–BO dan Konvensional
Get PDFPenelitian yang bertujuan mempelajari komposisi gulma tanaman padi sawah pada sistem bertanam secara IPAT-BO dan konvensional telah dilaksanakan pada bulan April 2013 sampai bulan Juli 2013 di Kelompok Tani Sadang Mukti, Kampung Sadang Sari, Kabupaten Bandung Jawa Barat yang terletak pada ketinggian 668 m di atas permukaan laut. Penelitian menggunakan metode eksperimen, dengan Rancangan Petak Terpisah, 3 kali ulangan, sebagai petak utama yaitu faktor metode pengairan (M), yang terdiri dari pengairan secara IPAT-BO dan konvensional, sedangkan anak petak adalah jarak tanam (J), yang terdiri dari : 30 x 35 cm, 30 x 25 cm, 35 x 35 cm,dan 30 x 30 cm. Hasil penelitian menunjukkan bahwa terjadi interaksi antara metode pengairan dan jarak tanam terhadap nilai jumlah dominasi gulma, dan bobot kering gulma.Gulma yang dominan pada perlakuan IPAT-BO lebih banyak dibanding perlakuan konvensional, sedangkan bobot kering gulma terberat terjadi pada metode IPAT-BO dengan jarak tanam 35 cm x 35 cm. The research was aimed to assess the effect of different plant spacing to weed composition and lowland rice yield in SOBARI and conventional irrigation methods. The experiment had been conducted in Farmers Groups Sadang Mukti, Sadang Sari Village, Bandung District, West Java at 668 m above sea level, from April 2013 to July 2013. It was arranged in split plot design, consisted of two factor, irrigation methods factor (M) as main plot, namely: irrigation methods in SOBARI (m1) and conventional (m2),subplot was plant spacing factor (J), which consisted of four levels of factors, namely: 30 x 35 cm, 30 x 25 cm, 35 x 35 cm, and 30 x 30 cm. The results showed that there was interaction between irrigation method and plant spacing on the value of domination number of weeds, and weed dry weight. Dominantweeds in SOBARI method were more than conventional treatment, weed dry weight in SOBARI method with spacing of 35 cm x 35 cm had greater than the other treatments.</p
Komposisi Gulma pada Berbagai Jarak Tanam Padi Secara IPAT–BO dan Konvensional
Get PDFPenelitian yang bertujuan mempelajari komposisi gulma tanaman padi sawah pada sistem bertanam secara IPAT-BO dan konvensional telah dilaksanakan pada bulan April 2013 sampai bulan Juli 2013 di Kelompok Tani Sadang Mukti, Kampung Sadang Sari, Kabupaten Bandung Jawa Barat yang terletak pada ketinggian 668 m di atas permukaan laut. Penelitian menggunakan metode eksperimen, dengan Rancangan Petak Terpisah, 3 kali ulangan, sebagai petak utama yaitu faktor metode pengairan (M), yang terdiri dari pengairan secara IPAT-BO dan konvensional, sedangkan anak petak adalah jarak tanam (J), yang terdiri dari : 30 x 35 cm, 30 x 25 cm, 35 x 35 cm,dan 30 x 30 cm. Hasil penelitian menunjukkan bahwa terjadi interaksi antara metode pengairan dan jarak tanam terhadap nilai jumlah dominasi gulma, dan bobot kering gulma.Gulma yang dominan pada perlakuan IPAT-BO lebih banyak dibanding perlakuan konvensional, sedangkan bobot kering gulma terberat terjadi pada metode IPAT-BO dengan jarak tanam 35 cm x 35 cm. The research was aimed to assess the effect of different plant spacing to weed composition and lowland rice yield in SOBARI and conventional irrigation methods. The experiment had been conducted in Farmers Groups Sadang Mukti, Sadang Sari Village, Bandung District, West Java at 668 m above sea level, from April 2013 to July 2013. It was arranged in split plot design, consisted of two factor, irrigation methods factor (M) as main plot, namely: irrigation methods in SOBARI (m1) and conventional (m2),subplot was plant spacing factor (J), which consisted of four levels of factors, namely: 30 x 35 cm, 30 x 25 cm, 35 x 35 cm, and 30 x 30 cm. The results showed that there was interaction between irrigation method and plant spacing on the value of domination number of weeds, and weed dry weight. Dominantweeds in SOBARI method were more than conventional treatment, weed dry weight in SOBARI method with spacing of 35 cm x 35 cm had greater than the other treatments
Pertumbuhan dan hasil kacang hijau kultivar Kenari dan No. 129 dalam tumpangsari bersisipan di antara padi gogo
No full textPenelitian ini bertujuan untuk mendapat-kan waktu penyisipan dua kultivar kacang hijau dalam tumpangsari bersisipan yang terbaik di antara padi gogo terhadap pertumbuhan dan hasil kacang hijau. Percobaan dilaksanakan dari bulan Desember 2010 sampai Juli 2011 di kebun percobaan Ciparanje Fakultas Pertanian Univer-sitas Padjadjaran, Jatinangor, Sumedang. Perco-baan ditata dalam Rancangan Acak Kelompok (RAK) dengan tiga ulangan yang terdiri atas 10 perlakuan yaitu A25 = kultivar Kenari + Waktu Penyisipan 25 hari sebelum panen padi gogo, A20 = kultivar Kenari + waktu penyisipan 20 hari sebelum panen padi gogo, A15 = kultivar Kenari + waktu penyisipan 15 hari sebelum panen padi gogo, A10 = kultivar Kenari + waktu penyisipan 10 hari sebelum panen gogo, A5 = kultivar Kenari + waktu penyisipan 5 hari sebelum panen gogo, B25 = kultivar No. 129 + waktu penyisipan 25 hari sebelum panen padi gogo, B20 = kultivar No. 129 + waktu penyisipan 20 hari sebelum panen padi gogo, B15 = kultivar No.129 + waktu penyisipan 15 hari sebelum panen padi gogo, B10 = kultivar No. 129 + waktu penyisipan 10 hari sebelum panen padi gogo, B5 = kultivar No. 129 + waktu penyisipan 5 hari sebelum panen padi gogo. Hasil penelitian menunjukkan waktu penyisipan kacang hijau di antara padi gogo dengan kisaran 25, 20, dan 15 hari sebelum panen padi gogo, memberikan pertumbuhan dan hasil kedua kultivar Kenari dan No. 129 lebih baik dibandingkan perlakuan 5 dan 10 hari sebelum panen padi gogo, dan menghasilkan nisbah kesetaraan lahan dengan besaran masing-masing kultivar 1,77; 1,53; 1,27 dan 1,77; 1,53; dan 1,63. Kata kunci : kultivar, waktu penyisipan, kacang hijau, relay intercropping, padi gogo. </jats:p
EFEKTIVITAS HERBISIDA PIRAZOSULFURON ETIL TERHADAP GULMA SERTA PENGARUHNYA TERHADAP PERTUMBUHAN DAN HASIL PADI SAWAH (Oryza sativa L.)
Get PDFGulma merupakan salah satu kendala utama dalam produksi padi sawah. Gulma menurunkan kualitas dan kuantitas hasil tanaman padi sawah sehingga gulma harus dikendalikan. Penelitian ini bertujuan untuk mengetahui efektivitas herbisida berbahan aktif Etil pirazosulfuron 20% untuk mengendalikan gulma padi sawah. Percobaan dilaksanakan di SPLPP Fakultas Pertanian Universitas Padjadjaran Ciparay, Kecamatan Baleendah, Kabupaten Bandung, Jawa Barat pada bulan November 2018 sampai Maret 2019. Percobaan menggunakan Rancangan Acak Kelompok satu faktor dengan tujuh perlakuan dan empat ulangan. Percobaan terdiri dari lima perlakuan herbisida berbahan aktif Etil pirazosulfuron 20% dengsan dosis 12 g/ha, 16 g/ha, 20 g/ ha, 24 g/ha, pengendalian gulma manual, dan tanpa pengendalian gulma. Hasil menunjukkan bahwa aplikasi herbisida berbahan aktif Etil pirazosulfuron 20% mulai dosis 16-16 g/ha mampu menekan pertumbuhan gulma Ludwigia octovalis, Marsilea crenata, Monochoria vaginali, Sphenoclea zeylanica, Cyperus iria, gulma species lain dan gulma total, serta menghasilkan produksi padi yang lebih optimal.
Kata kunci : herbisida, Etil pirazosulfuron 20%, gulma, padi sawa
Pengaruh pola tanam tumpangsari jagung dan kedelai terhadap pertumbuhan dan hasil jagung hibrida dan evaluasi tumpangsari di Arjasari Kabupaten Bandung
No full textJagung dan kedelai merupakan tanaman pangan terpenting setelah padi di Indonesia. Konsumsi jagung dan kedelai akan terus mengalami peningkatan setiap tahun dikarenakan pertambahan jumlah penduduk. Salah satu upaya untuk meningkatkan produksi tanaman dapat dilakukan dengan cara tumpangsari. Sistem tumpangsari merupakan sistem pertanaman dengan menanam dua atau lebih jenis tanaman secara serentak pada lahan yang sama dalam waktu satu tahun. Penelitian bertujuan untuk mengetahui genotip jagung hibrida yang terbaik ditumpangsarikan dengan kedelai. Percobaan dilaksanakan dari bulan Maret 2016 sampai bulan Agustus 2016 di Arjasari, Kabupaten Bandung dengan ketinggian tempat mencapai 960 m di atas permukaan laut. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok (RAK) yang terdiri dari 20 perlakuan dan diulang sebanyak 2 kali, dengan perlakuan 18 genotip dan 2 genotip cek, terdiri dari F1B X 4.8.8, F1E X 1.1.3, F1D X 3.1.4, F1F X G203, F1A X 4.8.8,, F1E X 3.1.4, F1H X G-673, F1I X G203, F1B X 1.1.3, F1E X 3.1.4, F1C X G203-1, F1G X 16.5.15, F1D X 16.5.15, F1H X 1.1.3, F1A X 16.5.15, F1I X G673, F1G X 673, F1C X 4.8.8, Maros 1 x 2 dan Maros 11 x 12 yang masing-masing ditumpangsarikan dengan tanaman kedelai. Hasil percobaan menunjukkan bahwa sistem tanam tumpangsari jagung dan kedelai dapat memberikan pengaruh yang lebih baik terhadap pertumbuhan dan hasil tanaman jagung genotip F1F x 3.1.4, Maros 1 x 2, dan Maros 11 x 12. Perlakuan jagung hibrida genotip F1B x 1.1.3, F1B x 4.8.8, F1C x 4.8.8, F1I x G203-1, Maros 1 x 2 dan Maros 11 x 12 yang ditumpangsarikan dengan kedelai memberikan pengaruh terbaik terhadap bobot biji pipilan kering per petak sebesar 2,60 – 3,30 kg/m2 setara dengan 5,77 – 7,34 ton/ha.Kata kunci : Jagung Hibrida, Kedelai, Tumpangsari</jats:p
Investigating oral performance on controlled versus spontaneous speaking tasks: Implications for second language pedagogy and assessment
Get PDFAssessment tasks of second language (L2) proficiency can be loosely classified into controlled and spontaneous tasks. While spontaneous tasks are widely accepted as authentic proficiency instruments, they can be time-consuming and labor-intensive to develop, administer, and score. In contrast, controlled tasks are more flexible and efficient, and have gained popularity with recent technological innovations. Although research has shown that controlled tasks are highly predictive of spontaneous performance, the question remains as to whether the two types of tasks measure similar kinds of language use (i.e., construct). To address this concern, this study examines characteristics of performance regarding both the product and process of language use on controlled versus spontaneous tasks to elucidate the constructs measured by these two types of tasks.
This study focuses on speaking proficiency by examining elicited imitation (EI) and the Oral Proficiency Interview (OPI), with each representing controlled and spontaneous speaking tasks, respectively. Employing a mixed-methods design, this study compared speaking performances of 75 L2 learners and 20 native speakers of Chinese on an EI and an advisory simulated OPI test. Test-taking processes and strategies were elicited through the use of questionnaires administered to a subgroup of 16 L2 learners and eight native speakers. Test responses were quantitatively analyzed for fluency, accuracy, and complexity features, and processes and strategies during task completion were qualitatively examined. Results of the quantitative analyses showed that speed fluency, accuracy, and complexity were elicited similarly by the two tasks, but breakdown and re- pair fluency were elicited differently. Results from the qualitative analyses demonstrated that both tasks required the processes of speech production and L2 learners employed common test-taking strategies to complete the tasks. EI elicited more cognitive strategies to process auditory input, while OPI elicited more metacognitive strategies for planning and communication strategies to deal with content breakdowns. In addition, the results revealed that both tasks tap into core components of language proficiency. The difference lies in that EI disfavors micro-level (dis)fluency, while OPI tolerates discourse-level (dis)fluency. These findings suggest that both EI and OPI tasks are valid measures of L2 oral proficiency, as reflected by their similarities in language use, but they also have unique task features, as revealed by the differences in language use. These findings have implications regarding the construct validity of controlled and spontaneous speaking tasks and can guide teaching and assessment practices in L2 Chinese as well as in other languages.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-08-01The student, Yuyun Lei, accepted the attached license on 2021-07-07 at 19:53.The student, Yuyun Lei, submitted this Dissertation for approval on 2021-07-07 at 20:47.This Dissertation was approved for publication on 2021-07-09 at 11:11.DSpace SAF Submission Ingestion Package generated from Vireo submission #16794 on 2022-01-12 at 12:53:55Made available in DSpace on 2022-01-12T22:35:05Z (GMT). No. of bitstreams: 3
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Respons jagung (Zea mays l.) akibat jarak tanam pada sistem tanam legowo (2:1) dan berbagai dosis pupuk nitrogen pada tanah inceptisol Jatinangor
No full textDi Indonesia jagung menjadi sumber karbohidrat kedua setelah padi. Selain sebagai sumber kebutuhan pangan jagung juga dapat digunakan sebagai sumber pakan ternak dan bahan baku industri.Penelitian ini bertujuan untuk mengamatiinteraksi sistem tanam legowo (2:1) dengan pupuk N yang menghasilkan pertum-buhan dan hasil terbaik pada tanaman jagung (Zea mays L.) Hibrida Pertiwi 3, di Jatinangor mulai bulan November 2016 sampai Maret 2017. Percobaan menggunakan Rancangan Acak Kelompok Pola Faktorial. Perlakuan terdiri dari dua faktor, masing-masing faktor terdiri dari tiga taraf dan diulang tiga kali. Faktor pertama adalah sistem tanam legowo (2:1) dengan menggunakan jarak tanam yang terdiri dari tiga taraf yaitu 75 cm x 25 cm x 25 cm, 75 cm x 30 cm x 30 cm dan 75 cm x 35 cm x 35 cm. Faktor kedua adalah dosis pupuk N terdiri dari tiga taraf, yaitu 200 kg/ha (2,25 g/lubang), 300 kg/ha (3,75 g/lubang) dan 400 kg/ha (5 g/lubang).Hasil percobaan menunjukkan bahwa terdapat interaksi antara jarak tanam legowo 2 : 1 denganpemberian pupuk N terhadap Indeks Luas Daun tanaman jagung. Jarak tanam legowo 2 : 1 memberikan hasil terbaik yaitu pada jarak tanam 75 cm x 25 cm x 25 cm dengan hasil (12264.00 g/petak atau 11,68 ton/ha) dan dosis pupuk N 400 kg/ha dengan hasil (11036.27 g/petak atau 10.05 ton/ha) terhadap bobot biji pipilan kering per petak dan per hektar. Kata kunci: Jagung, Sistem Tanam Legowo (2:1), Dosis Pupuk N</jats:p
PENGUJIAN INOKULAN KONSORSIUM DEKOMPOSER BERAGEN HAYATI DALAM LAJU DEKOMPOSISI JERAMI SELAMA MASA INKUBASI YANG DILAKUKAN DI RUMAH KACA
Get PDFThe use of fresh straw directly on agricultural land turns out have a negarif impact, among others, is the danger of grems contamination on the straw from theprevious crop and environmental pollution due to the formation of methane resulted from anaerobic decomposition of flooded rice field. The recommended solution is composting straw earlier. The main obstacle of this straw composting include necessary labor (preparation of materials, transportation, maintenance) and the cost is relatively high. An alternative solution is to do straw inoculation with bio agent consortium decomposers before tillage (direct composting). Inoculation consortium decomposer is added to the straw need to be tested its effect on decomposition rate, especially incubation time and incorporation also the type of consortium. The aim of this research is to determine the bio agent inoculant consortium decomposer incubation time to accelerate straw decomposition and nutrient availability. The experiments was conducted in the greenhouse of the Faculty of Agriculture University of Padjadjaran in April to May 2010, using a randomized block design in factorial pattern repeated three times, as factor I: Incubation time (1, 2, 3 and 4 MST) and factor II: inoculant: no inoculants; formula A = inoculant decomposers (Bacillus sp, Cytophaga sp, Streptomyces sp) and formula B = inoculant decomposers (Bacillus sp, Cytophaga sp, T. harzianum). The results of this experiment showed that administration of a consortium of formula A and B can accelerate the decomposition of straw (temperature increases and pH decreases), and with increasing incubation time can increase the value of C-organic, N-total, decrease C/N compared to controls
PENINGKATAN KUALITAS HASIL UBI TIGA VARIETAS KENTANG MELALUI APLIKASI PAKLOBUTRAZOL DI DUA DATARAN MEDIUM
No full textAbstractResearch aimed to know increase of quality of tuber yield due to packlobutrazol aplication in two medium altitude, was conducted in experimental station of Faculty of agriculture, Unpad, Jatinangor (760 asl) and Farmer land, Pasir Leungit (320 dpl), started from March until October 2011. Experiment was arranged in a randomized block design factorial pattern with two factors and replicated three times. First factor was cultivars namely 'GM08', 'Margahayu', and 'Atlantik', whereas second factors was four levels of packlobutrazol namely pure water, 30 mg, 60mg, and 90mg. Such experiments was conducted in two location with same design. Variables observed were starch content, dry matter content, specific gravity, and reducing sugar content.Results showed that there were interaction effect between cultivars and location on dry matter content, specific gravity, and reducing sugar content. Significant interaction effect between cultivars and packlobutazol was shown on specific gravity. Aplication of 60 mg packlobutrazol had given best quality of tuber yield of processing potato.Keywords: medium altitude, potato, tuber quality, packlobutrazol, processin
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