Tondano Lake, one of vital natural resources at Minahasa Regency, North Sulawesi, has some functions and some problems, i.e.: sedimentation and lake shallowing. This research was conducted by using water hyacinth (Eichornia crassipes (Malt)) as compost/organic fertilizer and sediment of Tondano Lake as plant media for Packoy growth. This research has aimed to: 1) Test the composition of Tondano Lake sediment, 2) Test the composition of water hyacinth compost, and 3) Measure the growth of Pakcoy toward the given compost as a preliminary research (Pot Experiment). This was conducted: a) sediment sampling at the west part of Tondano Lake, b) sediment and compost analyses at Chemical and Soil Fertility Laboratory of Agriculture Faculty of Unsrat, c) planting Pakcoy in small pots with Group-Randomized Design for nine months in 2016. Results showed that, 1) sediment composition of Tondano Lake as the plant media has tested, 2) compost composition of water hyacinth has tested, and 3) Pakcoy growth toward the given compost as a preliminary research (Pot Experiment) has measured by height of plant, number of leaves, and freshedweight of crops, andso would applicable in further research due to the result of analyses was significantly different. ABSTRAKDanau Tondano merupakan salah satu sumberdaya alam vital di Kabupaten Minahasa Provinsi Sulawesi Utara, memiliki berbagai peruntukkannya dan terdapat berbagai permasalahan, antara lain: sedimentasi dan pendangkalan danau. Penelitian ini dilakukan dengan memanfaatkan tanaman eceng gondok (Eichornia crassipes (Malt)) sebagai kompos/pupuk organik dengan sedimen Danau Tondano sebagai media tanam bagi pertumbuhan tanaman Pakcoy.Penelitian ini bertujuan untuk: 1) Menguji komposisi sedimen Danau Tondano sebagai media tanam, 2) Menguji komposisi kompos dari tanaman eceng gondok, dan 3) Mengukur pertumbuhan tanaman Pakcoy terhadap pemberian kompos sebagai penanaman awal (Percobaan Pot). Penelitian ini dilaksanakan: a) sampling sedimen di bagian barat Danau Tondano, b) analisa sedimen dan kompos di Laboratorium Kimia dan Kesuburan Tanah Fakultas Pertanian Unsrat, c)penanaman tanaman Pakcoy ditanam di pot-pot kecil dengan Rancangan Acak Kelompok selama sembilan bulan di tahun 2016. Hasil penelitian menunjukkan bahwa, 1) komposisi sedimen Danau Tondano sebagai media tanam telah teruji, 2) komposisi kompos dari tanaman eceng gondok telah teruji, and 3) pertumbuhan tanaman Pakcoy terhadap pemberian kompos sebagai penanaman awal (Percobaan Pot) telah terukur melalui tinggi tanaman, jumlah daun dan berat segar tanaman sehingga penelitian ini dapat diaplikasikan lebih lanjut oleh karena hasil analisisnya berbeda nyata.
Research has aimed to: 1)determine the composition of Lake Tondano sediment and organic manure as technology products, 2)apply those products as the effort of local resources management fulfilled the requirements for plant, 3)measure the growth and yield of nut plants toward the given organic manures. This research was conducted on Pot Experimental with application of technology product of Lake Tondano sediment as the mixture of planted media for growth and yield of nut plants (peanut and green pea) by given the organic manures (compost and green manure of water hyacinth, and poultry manure) in the method of Block Random Design. Using the sediment, water hyacinth and poultry manure was focused on this research in order to apply the technology product as the application of science and technology based local policy as the conservation effort to Lake Tondano in North Sulawesi province, Indonesia. Results showed that: 1)nutrient contents of Lake Tondano sediment for N,P,K were medium and C-organic content was very high and pH was neutral, 2)organic manures (compost and green manure of water hyacinth, and poultry manure) has variation and very high ratio of C/N, and the nutrient contents were fulfilled the requirements in using to apply as technology products, 3)given the organic manures on the mixture of Lake Tondano sediment gave significant effect on the growth and yield of nut plants (peanut and green pea), i.e.: variation doses of organic manures (green manure of water hyacinth of 10 ton/ ha + compost of water hyacinth of 10 ton/ ha + poultry manure of 10 ton/ ha) gave highest value on Pot Experiment. Height of plant and number of leaves increased with the extent of variation doses of organic manures. This experiment could be applied in further Field Experiment planning.
Province of North Sulawesi has been known as wave palm area (coconut). One of the plantations (coconut) potential become the farmer’s income and Locally-Generated Revenue (LGR). Therefore, it is important to maximize the soil function and root system of coconut. This research was aimed to diagnose a soil and coconut root existence in Lontang Plantation of Manado City. Soil observations were carried out on a single stretch of coconut plantations owned by community. The observation was done through the soil profile at a spacing of <1 m; 3 m and 5 m from the main tree of the coconut. The results showed that decreasing of C-Organic content in 1 m depth was not followed by enhancement of soil content weight, because C-Organic has spread equally in middle state and into the depth of >1 m on 3 and 5 m spacing profile from the main tree which categorized as low. Existence of total root length (Lrv) and dry root weight (Drv) shows that deeper soil will be more reduced of the root Lrv and Drv values along with the organic material in the bottom layer (> 1 m) lower than above it. The highest Lrv and Drv average value is located on the depth of 0 – 60 cm. Specrol existence on 1 - 3 m spacing profile have showed many soft roots which grow on these spacing. The soft root has a roles to absorb nutrient and water for the plant and direct contact with the soil.
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