Effect of sulphuric acid on control of lime induced iron chlorosis in groundnut
2001
Rao, U.Koteswara | Reddy, K.B. | Reddy, B.Ravindranath(S.V. Agricultural College, Tirupati(India). Department of Plant Physiology)
To investigate the effect of sulphuric acid on control of lime induced iron chlorosis in groundnut, cv. TCGS-37 was grown in calcareous soil with different levels of sulphuric acid (0.0, 1.0%, 1.5%, 2.0% and 2.5%). Application of H2SO4 to soil decreased iron chlorosis and significantly increased chlorophyll content and active iron in leaves. Acid application increased the total dry matter and pod yield. H2SO4 at 2.5% concentration recorded higher dry matter compared to other treatments. The increase in pod yield can be attributed to increasedavailability of Fe, P and chlorophyll contents. Acid application of above 2.0% raised the DTPA-Fe level of the soil above the critical limit of 4.5 ppm by decreasing soil pH, CaCO3 content and HCO-3 concentration. The results indicated that soil application of 2.5% H2SO4 was an effective means of controlling lime induced iron chlorosis in groundnut.
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