Indian Tea Association. Scientific Department. Annual Report by the Chief Scientific Officer on the Work of the Department for the Year 1933

In the case of the potash content this rise increased during the autumnal period but in the case of the phosphoric acid content this rise is maintained only in the case of the leaf from pldts manured with phosphatic manures. [...] Concerning the effect of the different manures on the content of P205 and K20 in the leaf phosphatic manure either with or without potash increases the phosphoric acid content of the leaf significantly throughout the season as compared with leaf which received no phosphate. [...] During the year 1933 the first of the experiment work has been confined to investigating the effect of the sulphur applications on the yield of tea and its general appearance and on the acidity of the soil. [...] The only treatment which has as vet had any effect on the acidity of the soil below the depth of 9 is sulphate of ammonia giving a considerable increase in the acidity of the sub-soil. [...] The following are the details of the experiment on the effect of cattle manure on crop from which experiment determinations were made of the effect on soil acidity of various quantities of cattle manure.