Macronutrient status of soils of Latif Farm: Block B and C [Pakistan]
2000
Junejo, N.
Twenty five composite soil samples were taken from blocks B and C at the depths of 0-15 and 15-30 cm. The soil samples were analyzed for NPK status and some physico-chemical properties, such as texture EC, pH, O.M, soluble calcium, magnesium and lime content. The research results shows that the soils of blocks B and C were heavy in texture at both depths. Electrical conductivity values of these soils ranged from 0.26 to 0.31 dS/m at surface layer and 0.30 to 0.35 dS/m at sub-surface layer, with an overall average value of 0.33 dSm. The pH values of the soils samples ranged from 7.5 to 8.4 in both blocks with an over all average value of 8.0. This indicates that the soils of the study area were alkaline in nature. Majority of the soils were poor to medium in organic matter. They ranged from 0.76 to 1.3% at surface layer and 0.12 to 0.80% at sub-surface layer in both blocks with an average of 0.70. The soils of the study area were 96% moderately calcareous and 4% slightly calcareous. The average value of CaCO3 in these soils was found 13.25%. The total nitrogen ranged from 0.004 to 0.065% at surface layer and 0.008 to 0.048% at sub-surface layer of both blocks (B and C). The average value of N content was 0.057%. The majority of soils were poor in total nitrogen. AB-DTPA extractable P of both blocks ranged from 1 to 6 mg/kg with an average value of 2.5 mg/kg. Most of the soil samples were (76%) low in AB-DTPA extractable phosphorus. AB-DTPA extractable K values were high in all the soil samples of study area. They ranged from 179.4 to 538.2 mg/kg in both blocks with an average value of 231 mg/kg. The calcium content of these soils varied from 25 to 90 mg/kg with the mean value of 39.67 mg/kg in both blocks. The Mg content of blocks B and C ranged from 3 to 44 mg/kg with an average value of 17 mg/kg. It is concluded from the results that the soils of Latif Farm, Sindh Agriculture University, Tandojam were clay to silty clay in texture, non-saline and moderately alkaline in reaction. Organic matter, total nitrogen and available phosphorus content of the soils of both blocks were low, while exchangeable potassium was high. The concentration of Ca++ was higher than the Mg++ in all the soils of the study area.
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