NPK status in effluent irrigated soils of some selected sites of NWFP [Pakistan]
2004
Midrar-ul-Haq (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Soil Science) | Khattak, R.A. | Puno, H.K. | Saif, M.S.
This paper presents the accumulation of NPK in effluent irrigated soils of some selected sites of NWFP. Forty samples from each depth 0-20 and 20-40 cm were collected from soils possibly contaminated by the industrial effluent irrigation, while eight samples (four samples from each depth) were taken from soil irrigated with tube well water, considered as `background soil'. The samples were collected both in summer and winter seasons of the years 2000 and 2001. All the soil samples were analyzed for physico-chemical properties and major elements (NPK). The soil samples were found alkaline in reaction, non-saline, moderately to highly calcareous in nature and low to adequate in organic matter content. The average values of NPK were 26.22, 16.92 and 94.16 mg kg-1 at 0-20 cm soil depth while 20.38, 10.6 and 76.15 mg kg-1 at 20-40 cm soil depth, respectively. However, the background soil values for NPK were 21.58, 8.39 and 95.22 mg kg-1 at 0-20 cm soil depth while 19.54, 6.39 and 73.72 mg kg-1 at 20-40 cm soil depth, respectively. The results showed significantly (P less than 0.01) higher level of NPK in surface soils compared to sub-surface soils.
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