Influence of Pesticides on the Trace Element Status of Soils : Part II. Effect of Nemagon on the Manganese and Iron Status of a Saline Soil

Section of Chemistry, Faculty of Engineering, Aligarh Muslim University, Aligarh.

Manuscript received 4 July 1975; revised 29 November 1975; accepted 6 December 1975

The effects of different doses of nemagon (1.2-dibromo-3 chloropropane) on the Mn and Fe status of a saline sodic soil over a period of 90 days were examined and the variance ratio, L.S.D. and correlation coefficients calculated. The results revealed that 0.3 ml of the pesticide per kg. of soil at an Interval of 30 days produced a most favourable significant response on water soluble, exchangeable and active Mn as well as on available and exchangeable Fe. All these constituents were positively correlated to each other. However, a negative correlation was observed between active and reducible Mn.  The effect of the chemical started declining after a period of 4 weeks. The responses have been explained on the basis of chemical and microbiological activity in the soil.