Pulau Punjung adalah kecamatan yang diprioritaskan untuk pengembangan komoditas kelapa sawit di Kabupaten Dharmasraya. Produksi kelapa sawit rakyat yang rendah disebabkan oleh proses penyerbukan yang tidak optimal sehingga terbentuk buah partenokarpi dengan fruit set rendah. Selama ini, penyerbukan pada tanaman kelapa sawit dibantu oleh serangga polinator Elaeidobius kamerunicus Faust. Akan tetapi, pada perkebunan kelapa sawit rakyat, populasi serangga tersebut rendah. Solusi untuk permasalahan tersebut adalah aplikasi teknologi hatch & carry serangga polinator E. kamerunicus. Teknologi tersebut diperkenalkan kepada mitra, yakni petani kelapa sawit rakyat yang tergabung dalam kelompok tani budi daya. Metode pendekatan yang digunakan adalah penyuluhan, pelatihan, demplot, bantuan alat berupa paket teknologi hatch & carry, serta pendampingan. Teknologi hatch & carry dapat menyelesaikan permasalahan yang dihadapi kelompok tani mitra. Hal itu ditandai dengan meningkatnya produksi TBS setelah metode tersebut diaplikasikan selama empat bulan. Keberhasilan aplikasi teknologi tersebut berkat meningkatnya pengetahuan dan keterampilan petani mitra setelah mengikuti rangkaian kegiatan pengabdian. Pada akhir kegiatan, kelompok tani mitra diberi perangkat teknologi hatch & carry yang terpasang di lahan dan bisa dioperasikan secara mandiri.
This study consisted of two stages of the experiment, in which the first phase was aimed to test the level of activity unproductive coal powder (sub-bituminous) activated with urea (CO(NH2)2). Experiment II was aimed to select the dose of Urea was right in fixing chemical properties sub-bituminous powder to be applied to mineral soil acidic (Ultisols). Experiment I form into activation powder sub-bituminous (50 g) with urea at a dose of 1,
Soil carbon is very important in food security, ecosystems, and environmental health, especially in the context of global climate change. This study was to determine the effect of carbon sequestration from bamboo biochar on increasing the productivity of marginal soils in the second planting season planted with soybean [Glycine max L.]. This study used a completely randomized design with 3 replications in 5 treatments: A = 0.0% [0g pot−1] B = 0.5% [173g pot−1]; C = 1.0% [348g pot−1]; D = 1.5% [520g pot−1] and E = 2.0 [693g pot−1] of bamboo biochar. The results showed that carbon sequestration from bamboo biochar had a significant effect on the chemical properties of Ultisols, such as increasing pH, available P, organic C, total N, CEC, and Ca-exch and could reduce Al-exch, by 0.90 units, 2.50 ppm P, 1.12% C, 0.13% N, 5.48; 1.79 and 0.88 cmolckg−1, compared to controls and increase in soybean growth and NPK nutrient uptake in stems and leaves [3.57g N, 2.61g P, 4.64g K], also in roots [0.93g N, 1.03g P, 0.94g K], compared to controls. Carbon sequestration from bamboo biochar with 2% application can increase the productivity of marginal soil [Ultisols] and soybean [Glycine max L.].
This experiment was conducted to extract sub-bituminous coals for obtaining humic substances by using 10 kinds of extract solutions. The best and effective solution was investigated and also the characteristics of humic substances soluble in those solution. Complete Randomize Design was used to find out the effect of treatments. Two types of coals were taken from Pasaman and Sawahlunto and the ten kinds of extract solutions were 0.1 N NaOH, 0.5 N NaOH, 0.1 M Na2CO3, 0.5 Na2CO3, 0.1 N HCl, 0.1 M Formic Acid, 0.1 M Oxalic Acid, 0.025 N HF, Ethanol 70 %, and Ethanol 90 %. Results of this laboratory experiment showed that all ten extraction solutions had the ability to extract humic substances but in different amount. The best solution that could be used effectively was 0.5 N NaOH. This solution could extract 31.5 % of humic substances from Pasaman Sub-bituminous coals, but only 15.4 % could be extracted from that of Sawahlunto. Infra Red Spectrometer was also used to identify the characteristics of functional groups appear on those humic substances extracted.Key Words: humic acid, coal
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