Micronutrient (Cu, Fe, Mn and Zn) status of soils and banana plants in district Nawabshah [Pakistan]
2002
Mughal, A.Y.C.
Total 46 soil samples at 0-15 and 15-30 cm depths and 23 leaf samples were secured from 23 different banana growing areas. Majority of were heavy in texture and soils were non-saline in nature in both depths. Soils were alkaline in reaction. pH ranged from 7.2 to 8.2 at 0-15 cm and from 7.4 to 8.2 at 15-30 em soil depth. Organic matter content ranged from 0.49 to 1.53% at 0- 15 cm and 0.41 to 1.16% at 15 to 30 cm depth. Lime content ranged from 11.2 to 15.5% at 0-15 cm depth and from 8.0 to 16-0% at 15-30 cm depth. Soluble calcium content ranged from 2.0 to 11.0 meq/1 at 0-15 cm and from 2.0 to 12.0 meq/1 at 15-30 cm depth. Soluble magnesium content ranged from 2.0 to 10.0 meq/1 at 0- 15 cm and from 2.0 to 8.0 meq/1 at 15-30 cm soil depth. Copper content of surface and sub-surface soils ranged from 1.12 to 5.269 mg/kg at 0-15 cm depth and 0.971 to 4.52 mg/kg at 15-30 cm depth. Iron content ranged from 7.26 to 16.2'8 mg/kg at 0-15 cm depth and from 6.336 to 15.17 mg/kg at 15-30 cm depth. Manganese content ranged from 5.303 to 13.06 mg/kg at 0-15 cm depth and 3.94 to 10.37 mg/kg at 15-30 cm depth. Zinc content ranged from 0.26 to 2.66 mg/kg at 0-15 cm depth and 0.29 to 0.91 mg/kg at 15-30 cm depth. Copper leaf concentration ranged from 35.7 to 45.544 mg/kg with an average 37.7 mg/kg. Iron leaf concentration ranged from 116.9 to 324.35 mg/kg with an average of 198.59 mg/kg. Manganese leaf concentration ranged from 34.77 to 179.14 mg/kg with an average of 110.16 mg/kg. It was found that all leaf samples were above the critical level for iron, copper and manganese. Zinc leaf concentration ranged form 12.77 to 20.82 mg/kg with an average of 17.30 mg/kg. Thus it was that 10 sites were above the critical level and 13 sites were below the critical level in leaves Zn concentration. The correlation study showed that soil micronutrient (Cu, Mn, Fe and Zn) content was non significant with leaves micronutrient (Cu, Mn, Fe and Zn) concentrations. Soil (Cu, Mn and Fe) content were non- significantly correlated with yield. While toil Zn content had positive and significant correlation with yield. The concentration of Cu, Mn and Zn in leaves were non-significant with yield, leaves Fe- concentration was positive and significant correlation against yield. The results revealed that mostly the soils were heavy in texture, non-saline, moderately alkaline in reaction, poor in organic matter and moderately calcareous in nature. The soils and plants were adequate in Cu, Mn and Fe while Zn was deficient.
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