Metode Pengujian Mutu Fisik Dan Fisiologis Benih Pulai (Alstonia Scholaris)

Metode pengujian mutu benih di laboratorium dilakukan untuk mengetahui mutu benih, baik mutu fisik maupun fisiologis. Metode pengujian yang digunakan untuk kegiatan sertifikasi mengacu pada metode pengujian yang tercantum dalam ISTA (1999). Mutu fisik yang diteliti adalah berat 1000 butir dan kadar air benih, sedangkan mutu fisiologis dilihat dari hasil uji perkecambahan. Tujuan dari penelitian ini adalah mendapatkan metode pengujian mutu fisik dan fisiologis benih tanaman hutan yang dapat diaplikasikan. Bahan yang digunakan dalam penelitian ini adalah jenis benih tanaman pulai (Alstonia scholaris). Media perkecambahan di laboratorium berupa kertas merang dan media di rumah kaca berupa pasir dan tanah (v/v) 1:1. Rata-rata kadar air pulai adalah 9,94%. Berat 1000 butir adalah 1,98 g dan jumlah benih/kg adalah sekitar 535.308 butir. Pengujian perkecambahan benih pulai yang terbaik adalah di rumah kaca

Metode Pengujian Mutu Fisik Dan Fisiologis Benih Pulai (Alstonia Scholaris)

Metode pengujian mutu benih di laboratorium dilakukan untuk mengetahui mutu benih, baik mutu fisik maupun fisiologis. Metode pengujian yang digunakan untuk kegiatan sertifikasi mengacu pada metode pengujian yang tercantum dalam ISTA (1999). Mutu fisik yang diteliti adalah berat 1000 butir dan kadar air benih, sedangkan mutu fisiologis dilihat dari hasil uji perkecambahan. Tujuan dari penelitian ini adalah mendapatkan metode pengujian mutu fisik dan fisiologis benih tanaman hutan yang dapat diaplikasikan. Bahan yang digunakan dalam penelitian ini adalah jenis benih tanaman pulai (Alstonia scholaris). Media perkecambahan di laboratorium berupa kertas merang dan media di rumah kaca berupa pasir dan tanah (v/v) 1:1. Rata-rata kadar air pulai adalah 9,94%. Berat 1000 butir adalah 1,98 g dan jumlah benih/kg adalah sekitar 535.308 butir. Pengujian perkecambahan benih pulai yang terbaik adalah di rumah kaca

Pengaruh Ukuran Benih Terhadap Perkecambahan dan Pertumbuhan Bibit Tanjung (Mimusops elengi L.) The Effect of Seed Size on Seed Germination and Growth of Tanjung (Mimusops elengi L.) Seedling

Tanjung (Mimusops elengi) is a multipurpose tree species, besides the use of its wood for bridge, boat, floor, door, and furnitures, other parts of this tree such as root, leaves and bark, can be used for medicine. This species is one of tree species that potential be developed in planting programme. Tanjung seed has variation in weight and size that need information in how the variation will influence the germination and the seedling growth. The seed has been collected in Padang, West Sumatera. Research was done to examine the influence of seed size to the germination and physical quality of seedling by using the extracted seed. The seeds were divided into three parts in size including large, medium and small. The experiment design was completely ramdomized design. Every unit of the experiment consist of 3 replications that contain 100 seeds each replication for germination and 25 seedlings each replication for the growth of seedling. Sterilized medium for germination and the growth of seedling was mixed of soil and sand (v/v 1:1). The parameters to be observed were germination percentage and speed of germination, and height and diameter of seedling. The results indicated that for collection of tanjung (M. elengi) seeds should be done only at the large and medium size caused by the capability of the seed to grow to be seedling within 3 months in the nursery higher compared to the small size.

Growth of Red Sengon (Albizia Chinensis (Osbeck) Merr.) Seedlings on the Molded Seedling Media and Its Comparison with Polybag Seedling

The development of alternative methods for land and forest rehabilitation is necessary for producing good quality seedlings. This study aims to examine and compare the effect of addition of mycorrhiza and rhizobium on the growth of red sengon (Albizia chinensis (Osbeck) Merr.) seedlings in molded seedling media (BMSM) and the addition of various dosages of basic fertilizers to the seedlings on polybags. Seedlings in MSM were tested in the nursery until the age of 3 months. The field test was conducted by comparing the growth of red sengon (6 months after planting) seedlings from the BMSM and seedlings on polybags. The design used was a randomzed block design. BMSM that has been added with 3 g of rhizobium per seedling gave the best growth seedling and plant growth in the field. The growth of the seedling on polybags was increased by giving basic fertilizer of 5 kg per planting hole. Red sengon seedlings originated from seedling in BMSM with the addition of 3 g of rhizobium and seedlings on polybag with a dosage of 5 kg basic fertilizer had the highest growth. BMSM as an alternative technology for tree seedling production can be used for planting, and land or forest rehabilitation

Pengaruh Ukuran Benih Terhadap Perkecambahan dan Pertumbuhan Bibit Tanjung (Mimusops elengi L.) The Effect of Seed Size on Seed Germination and Growth of Tanjung (Mimusops elengi L.) Seedling

Tanjung (Mimusops elengi) is a multipurpose tree species, besides the use of its wood for bridge, boat, floor, door, and furnitures, other parts of this tree such as root, leaves and bark, can be used for medicine. This species is one of tree species that potential be developed in planting programme. Tanjung seed has variation in weight and size that need information in how the variation will influence the germination and the seedling growth. The seed has been collected in Padang, West Sumatera. Research was done to examine the influence of seed size to the germination and physical quality of seedling by using the extracted seed. The seeds were divided into three parts in size including large, medium and small. The experiment design was completely ramdomized design. Every unit of the experiment consist of 3 replications that contain 100 seeds each replication for germination and 25 seedlings each replication for the growth of seedling. Sterilized medium for germination and the growth of seedling was mixed of soil and sand (v/v 1:1). The parameters to be observed were germination percentage and speed of germination, and height and diameter of seedling. The results indicated that for collection of tanjung (M. elengi) seeds should be done only at the large and medium size caused by the capability of the seed to grow to be seedling within 3 months in the nursery higher compared to the small size.

Performance of seedling and mixed-species planting test of three species of Rubiaceae treated by different seedling media and mycorrhizae application

Seedling growth in the nursery and early field performance of three fast-growing tree species from the Rubiaceae family, i.e., white jabon (Neolamarckia cadamba), red jabon (Neolamarckia macrophylla, and gempol (Nauclea orientalis), were tested by using different seedling media and arbuscular mycorrhizal fungi (AMF) treatments in the nursery and mixed-species field tests. The experiment design in the nursery and field test was laid out following a split-split plot design of a randomized complete block with four replications. The main factors were tree species, the sub-factors were seedling media, and the sub-sub factors consisted of the AMF inoculation, with a mixed species planting pattern. White jabon had a more dominant growth both at the seedling level in the nursery and at the field test level until the age of 2 years, followed by gempol and red jabon. AMF inoculation in those three species at the seedling level was strongly influenced by the characteristics of the seedling media like media with high fertility levels resulting in a very low percentage of AMF colonization. In the field trial, all tree species and treatments were infected with mycorrhizae with colonization percentages ranging from 27.6% to 57.7%, which was suspected to be an infection from native AMF in the planting site. The AMF application had a significant effect on the percentage of colonization and tree diameter growth of 2-year-olds with a percentage increase of 14.4% and 8.4%, respectively

Measurement of the Z/gamma* + b-jet cross section in pp collisions at 7 TeV

The production of b jets in association with a Z/gamma* boson is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV and recorded by the CMS detector. The inclusive cross section for Z/gamma* + b-jet production is measured in a sample corresponding to an integrated luminosity of 2.2 inverse femtobarns. The Z/gamma* + b-jet cross section with Z/gamma* to ll (where ll = ee or mu mu) for events with the invariant mass 60 < M(ll) < 120 GeV, at least one b jet at the hadron level with pT > 25 GeV and abs(eta) < 2.1, and a separation between the leptons and the jets of Delta R > 0.5 is found to be 5.84 +/- 0.08 (stat.) +/- 0.72 (syst.) +(0.25)/-(0.55) (theory) pb. The kinematic properties of the events are also studied and found to be in agreement with the predictions made by the MadGraph event generator with the parton shower and the hadronisation performed by PYTHIA.Comment: Submitted to the Journal of High Energy Physic