| Autor: |
Awasthi, K. D., Tiwari, K. R., Balla, M. K., Sitaula, B. K., Slngh, B. R., Pandit, K. |
| Zdroj: |
International Journal of Ecology & Environmental Sciences; Sep2007, Vol. 33 Issue 2/3, p105-114, 10p, 4 Diagrams, 4 Charts |
| Abstrakt: |
This paper aims at comparing the soil, runoff and nutrients losses in runoff water among three treatments in rainfed upland terraces (Ban) and aspect-wise soil quality of different land uses in Pokhare Khola watershed, Dhading district, Nepal. The runoff plot study is being carried out at Raigaun (500 m) in a completely randomized design with four replicates of each treatment viz. T1 (Farmers Practice with Maize- Millet), T2 (Reduced tillage with Maize- Bean - Cover crop), and T3 (Commercial vegetable with high organic manure with Maize- Chilly). Measured runoff and soil loss (2004 to 2005 data) varied from 1040 to 1641 land 0.64 to 3.78 Mg\ha-1 and mean runoff and soil loss from 1114 to 1366 (1) and 1.04 to 2.25 Mg ha-1 respectively. Dissolved nitrogen and phosphorous losses through runoff varied from 2.54 to 5.34 and 0.06 to 0.13 kg ha-1, respectively. T2 had higher loss of both N and P compared to other treatments. The monthly rainfall erosivity computed based on rainfall intensity duration data of 2003 and 2004 at Rai Gaun varied from 49 MJ mm ha-1 h-1 to 2626 MJ mm ha-1 h-1, whereas annual erosivity were found 6250 and 2350 MJ mm ha-1 h-1 y-1 for 2003 and 2004, respectively. Computed aspect- wise soil quality index (SQI) based on soil properties (0-15 cm depth) for Ban, irrigated lowland (Khet) and forest varied from 0.23 to 0.72. SQl was highest in Ban of northern aspect whereas lowest in forest of southern aspect. Landuse-wise SQl varied from 0.49 to 0.59, the highest being in Ban whereas lowest in forest. Soil quality of forest was poor compared to other land uses in the area. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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