Phosphorus micronutrients relationship studies in wheat crop grown in calcareous soils
1999
Siddique, T. (Ayub Agricultural Research Inst., Faisalabad (Pakistan). Soil Chemistry Section). Rashid, M. | Saeed, M.
A pot experiment was conducted to study the phosphorus-micronutrient interaction in calcareous soils for two years. Four rates of phosphorus (0, 25, 50 and 75 mg P2O5 kg-1) were applied to wheat crop grown in three types of soil containing 3, 7 and 11% lime contents. In the first year of experiment, phosphorus @ 25 mg P2O5 kg-1 in soil containing 3% lime and 50 mg P2O5 kg-1 in soil containing 7% lime increased zinc contents of soil but, beyond these rates, decreased zinc contents of soil. Phosphorus application upto 50 mg P2O5 kg-1 increased zinc concentration in plant and decreased zinc concentration of plant at 75 mg P2O5 kg-1 in all types of soil. In the second year of experiment, phosphorus application decreased zinc content of soil containing 3% lime. Increasing rates of phosphorus reduced zinc concentration in plants grown in soils containing 3 and 7% lime while in soil having 11% lime, last level of phosphorus (75 mg P2O5 kg-1) decreased zinc concentration in plants. Addition of phosphorus depressed iron concentration in plants grown in soil containing 11% lime during first year of experiment. Application of phosphorus did not influence manganese concentration in plant during both the years of experiment.
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