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- 저자 : Rekha Chhetri (검색결과 2 건)
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Cheten Thinley,Baghat Suberi,Rekha Chhetri 강원대학교 산림과학연구소 2023 Journal of Forest Science Vol.39 No.1
We investigated Soil respiration in Bluepine forest of western Bhutan, in relation to soil temperature, moisture content and soil pH and it was aimed at establishing variability in space and time. The Bluepine forest thrives in the typical shallow dry valleys in the inter-montane Bhutan Himalaya, which is formed by ascending wind from the valley bottom, which carries moisture from the river away to the mountain ridges. Stratified random sampling was applied and the study site was classified into top, mid, low slope and further randomized sample of n=20 from 30 m×30 m from each altitude. The overall soil respiration mean for the forest was found 2248.17 CO2 g yr-1 and it is ∼613.58 C g yr-1. The RS from three sites showed a marginal variation amongst sites, lower slope (2,309 m) was 4.64 mol m-2 s-1, mid slope (2,631 m) was 6.78 mol m-2 s-1 and top slope (3,027 m) was 6.33 mol m-2 s-1 and mean of 5.92 mol m-2 s-1, SE=0.25 for the forest. Temporal distribution and variations were observed more pronounced than in the space variation. Soil respiration was found highest during March and lowest in September. Soil temperature had almost inverse trend against soil respiration and dropped a low in February and peak in July. The moisture in the soil changed across months with precipitation and pH remained almost consistent across the period. The soil respiration and soil temperature had significant relationship R2=-0.61, p=0.027 and other variables were found insignificant. Similar relationship are reported for dry season in a tropical forest soil respiration. Soil temperature was found to have most pronounced effect on the soil respiration of the forest under study.
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Choeki Wangchuk,Min-Jeong Kim,Chnag-Ki Shim,Jae-Hyeong Lee,Rekha Chhetri,Sang-Gu Park 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
The use of chemical fertilizers are increasing yearly in Bhutan contributing to environmental pollution and human health hazard. The use of bio-fertilizers such as multiplex Annapurna and spic subrabi are not much familiar to the famers due to lack of less information on its effectiveness in crop yield and nutrients contain. A field experiment was carried out to compare the effects of different fertilizers on growth and yield of okra (Abelmoschus esculentus L.). The randomized complete block design experiment had five treatments with four replications. Besides a control, the experiment included bio-fertilizer Multiplex Annapurna, bio-fertilizer Spic Surabi, farm yard manure (FYM), and chemical fertilizer (NPK) treatments. Bio-fertilizers were applied at the rate of 297kg/ha while FYM and NPK chemical fertilizers were applied at the rate of 4,000 kg/ha and 100:150:50 kg/ha respectively. Plant height, stem diameter, plant canopy, and number of leaves were measured at 42, 54, 66, and 78 days after sowing (DAS). Yield and yield components (number of fruits per plants, fruit length, and fruit weights) were assessed at the time of harvest. Fertilizer treatment had a significant effect on growth and yield of okra (p < .05). Spic Surabi gave the highest yield (11.77 t ha-1) and the lowest (9.63 t ha-1) was from control treatment. The results indicated that the application of bio-fertilizer, mainly Spic Surabi, increases growth and yield of okra.
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