Effect Inundation Period to Summed Dominant Ratio (SDR) and Biomass Rice Weeds of Method SRI (System of Rice Intensification) in Indonesia

Research by title the effect inundation period to summed dominant ratio (SDR) and biomass rice weeds of method SRI (system of rice intensification) in Indonesia. Research have been conducted in the Faculty of Agricultural Land Andalas University, Limau Manih, Padang, from February to May 2018. The study aims to identify noxious weed found in SRI method of paddy cultivation in Indonesia. Weeds that have summed Dominance Ratio (SDR) and the highest biomass in this study is a weed Cyperus rotundus, Scirpus juncoides Roxb., Fimbristylis miliacea (L.) Vahl, Cyperus pedunculatus and Richardia brasiliensis Gomez. Highest weed biomass obtained in the treatment of inundation 3 days old and weed biomass lowest is 15 days long inundation

Karakteristik Morfologi Dan Genetik Tanaman Penghasil Gaharu (Aquilaria Spp) Endemik Sumatera Barat

Agarwood (Aquilaria spp) is plant of tha important tropical forest trees,which produces a high economically valuable fragrant resinous wood. The objective of this study was to characterize the agarwood based on morphologist are genetic distance using RAPD markers. Characterizeof the agarwood based on morphologist and genetic distance by using RAPD markers is on alternative method to see variance morphologist,genetic and condition population plant agarwood (Aquilaria sp) endemic West Sumatra. This experiment was conducted at rain forest West Sumatraand Laboratory Agronomy Agriculture faculty Andalas University, and Laboratory Biotecnology Seameo Biotrop Bogor, during mar 2006 toDecember 2007.The result showed two group mayor cluster to agarwood i.e. Aquilaria malacensis and Aquilaria microcarpa endemic West Sumatra by using fenotipe variabilities and RAPD markers. Broad genetic variabilties were found for long and wide leaf width

Tantangan Pengembangan Padi Dikabupaten Kepulauan Mentawai

This study aims to identify the problems and develop rice agribusiness in Mentawai Islands from upstream to downstream and formulate appropriate policy recommendations to be implemented. The research location determined by purposive namely in the village Makalo and Malakopa District of South Pagai, Sikakap subdistrict Taikako Village, Village Saumanganya District of North Pagai, Bosua Village and Village Beriulou District of South Sipora, Village Rogdog and Madobag District of South Siberut. Respondents in this study were 30 farmers. Respondents farmers selected by simple random sampling method. The results showed that the majority of rice paddies new openings in six districts consist of peatlands with a depth varying from 0.4- > 2.0 meter, fields new openings that have been implemented in the Mentawai Islands in general can not be expected to result in maximum productivity due to problems of land suitability diverse. Farmers also do not take action appropriate technical culture starting from land preparation, seed selection, weeding, fertilizing and water management. Behaviorally agriculture, farmers in Mentawai Islands is not a society that blends with the culture of rice fields, it is because basically their agricultural base is dry land agriculture with farming patterns. This will certainly give a great challenge and not easy for the cultivation of rice in the Mentawai Islands

Pengaruh Optimalisasi Bibit dan Pupuk Kandang Ayam terhadap Pertumbuhan Vegetatif Tanaman Padi Intensifikasi SRI

Influences of Seedling Optimizations and cock secretion fertilizer on rice plant vegetative growth in the system of rice intensification: SRIABSTRACT. The application or the system of rice intensifications (SRI), including seedling and optimalizations and cock secretion fertilizer (CSF) were done. The treatment aim to know the local production level in heavy wet tropic region. The research was conducted in Limau Manis, aside the campus of Andalas University, from July to December 2005 used var. Cisokan. The spilt plot design was applied in the research. The fertilizers were applied according to the recommended 200kg Urea, 200kg SP-36, 150kg KCl. The research variables are plant growth rate, net assimilation ratio, leaf area index, leaf area ratio, shoot/root ratio, tiller number, water use efficiency, and evaporating/ transpiration ratio. The research conclude that the higher the CSF input, the higher the plant vegetative growth. Besides, there were found no different response of 1 to 2 applied seedling, as well as 7 days to 14 days applied seedling with the input

Biodiversity of Arbuscular Mychorrizal Fungi (Amf) on Potatos Rhizosphere and IT Potential as Biofertilizer

AMF as the biofertilizer on several crops has been reported, but not so much the information about biodiversity of AMF on potatos rhizosphere and its potential to colonize that crop. The research about the biodiversity of AMF has been done in laboratorium Biology in Faculty of Agriculture of Andalas University and in laboratorium Biotecnology of Agriculture Faculty of Jambi University from November 2004 till April 2005. The sample of soil have been collected from rhizosphire of potatos plant in Alahan Panjang, West Sumatera, and then the AMF spore are isolated and identification based on morphology and size of spores. Inoculation of single and multi spores to potatos root to see the structure of colonization and percentage of colonization. The result of identification of AMF spores show that there are many kind of spores on rhizosphere of potatos plant and the spores are dominated by: Glomus, Acaulospora, Scutellospora, Gigaspora, and Enterophospora. Unfortunately, the inoculation of single spore has no good effect to the structure of colonization and the potatos plant not vigorous and easy to be severe of stem desease. But, inoculation with multi spores show that the tipe of colonization on potatos root have the coil hyphal and intracellular vesicular. The same result also indicated that colonization with active propagule (mycelium, spores, and infected root) have the coil hyphal and intracellular vesicular. The species of AMF that have the typical characteristic is assumed as Gigaspora sp.