Volume 3, Issue 4
April 1936, pages 283-376
pp 283-301 April 1936
pp 302-309 April 1936
Observations have been made on the growth of the rice plant and yield of paddy under arid and flooded conditions with and without addition of organic (green) manure, sodium silicate and potassium phosphate respectively. It is found that treatment with sodium silicate increases the yield of grain and straw and that both in unmanured and manured soils the response is greater in arid than in flooded series.
pp 310-319 April 1936
pp 320-327 April 1936
Lactic, acetic, propionic and butyric acids are the chief products of fermentation of cane molasses in the swamp soil. Of these, acetic and butyric acids form the major part, while propionic and lactic acids are present in smaller quantities. These is no evidence to show that the volatile fatty acids are derived from lactic acid.
Fermentation of sodium lactate by the mixed flora of the soil results in the production of all the three volatile fatty acids. Propionic acid is the chief product and its molecular proportion is about twice that of acetic acid. Butyric acid is present in still smaller quantities.
Fermentation of lactate in the soil proceeds in accordance with the Fitz equation and the Virtanen theory of fermentation; that of molasses follows a different course.
pp 328-333 April 1936
pp 334-361 April 1936
The physiological reactions of the three types of Indian nodule bacteria (C. indicus, D. biflorus andPs. tetragonolobus) have been studied and ascertained, as is indicated in the tables.
In the isolation of the nodule organism fromCajanus indicus roots we found with certain characters of constancy a contaminant or rather a concomitant, which has not the characteristics ofB. radiobacter, the only organism likely to be met with.
TheCajanus indicus root nodule organism is placed by various authors Löhnis and Leonard, in the Cowpea group, the members of which have got an alkaline reaction on milk medium and also on nearly all sugars. The organism ofC. indicus isolated by us differs in this respect from the members of the Cowpea group in having acid reaction on litmus milk, and mixed reactions on sugars, acidic and alkaline.
The use of gelatin stabs, commonly followed in the study of gelatin reactions, may account for much of the irregularity of reaction and disagreement observed in the conclusions of different authors. Our procedure of the gelatin slants gives clear results, sometimes in half the time, and great advantage will be derived from its general adoption.
Garman and Didlake’s method proved successful as regards the culturing of host plants, but not as regards the nodule formation. Pending the study of a modification of the same, we devised an easy and reliable method of pot cultures which can be depended upon to give clear results in our exacting conditions of temperature and moisture.
pp 362-365 April 1936
A new organism (Bacillus concomitans nov. sp.) is described which is found frequently inside the nodules formed inCajanus indicus. When isolated in pure culture it does not produce nodules, it gives a Congo-red negative reaction and possesses many other characteristics which differentiate it fromRhizobium radicicola andB. radiobacter.
pp 366-376 April 1936
The basic intrusives of Danta State can thus be classified into the following types according to their structural and mineralogical characters. These rock-types may also represent the three basic phases of igneous activity in this area during the Post-Aravalli period:—
Oldest intrusives (Post-Aravalli, but Pre-Granitoid-Gneiss, in age). Pyroxene-granulite, Epidiorite and Hornblende-schist.
Older intrusives (Post-Granitoid-Gneiss, but Pre-Erinpura-Granite, in age). Meta-gabbro and Meta-dolerite.
Younger intrusives (Post-Erinpura-Granite in age) Olivine-dolerite and Olivine-basalt.
The younger intrusives of olivine-dolerite and olivine-basalt afford an interesting study in the alteration and replacement of pyroxene.