Volume 45, Issue 1
January 1957, pages 1-26
pp 1-8 January 1957
pp 9-15 January 1957
(1) Pot culture studies on the effect of 2, 4-D on sugarcane have been reported in the paper.
(2) Soil application of 2, 4-D (amine salt) at planting increases sugar content by about 2·6 units while depressing yield by 40%. Sodium salt of the hormone applied at this stage has no significant effect on yield or quality.
(3) Soil application of both salts, either two weeks after germination or at the time of earthing up, significantly improves sugar content (by 1·8 units) with no significant effect on yield.
(4) The same holds good for foliar application, mean improvement in sugar being 1·5 units.
(5) When applied to soil two weeks after germination, at earthing up or as foliar spray, the two forms of the hormone afford the same order of improvement in sugar (1·6–1·8 units).
(6) The above results conform to the findings of large-scale trials in collaboration with the sugar industry, reported earlier.
pp 16-20 January 1957
pp 21-26 January 1957
1. An oxidation product of vitamin B12 inhibits growth ofE. coli (Macleod).
2. Of various substances tried, it is observed that yeast extract, peptone,E. coli crushed cells extract or a mixture of amino acids, overcome growth inhibition of the B12 oxidation product to an appreciable extent.
3. The amino acids when tried individually are found to be inactive.