At these conferenc 41 the needs of the district are discussed and programmes of work drawn up in the light of the requirements of the particular area. [...] The Research Council consisting of the heads of the different research sections in the Agricultural Institute scrutinizes the programme of work and reports on investigations and schemes under execution in the Agricultural department. [...] (iii) Investigation of the cholam effect and the changes in the physico-chemical properties of the black cotton soil brought about by various crop rotations.—The so-called Cholam effect ' referring to the depressing effect of irungu cholam on the succeeding crop noticed particularly in the black cotton soil tract of the Tirunelveli district has boon the subject of investigation by the Cottou Speci [...] The oxygen demand and pH value of the drainage waters the microbial population ammonifying and nitrate-reducing organism of the soils at the start of the experiment and at the final drainage stage were also determined. [...] Data regarding the yield dry matter nitrogen content and decomposability of the green manures the nitrogen content and microbial population of the soils drawn from the plots after the harvest of paddy the yields of grain and straw and the economic aspect of the trial were recorded.
- Pages
- 88
- Published in
- India
- SARF Document ID
- sarf.146621