• Volume 41, Issue 6

      June 1955,   pages  241-268

    • Studies of the rust onSetaria italica

      T S Ramakrishnan N V Sundaram

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      The relative reaction of the alleged resistant cultures of Tenai from the Agricultural Research Station, Hagari, and 339 cultures available at the Millets Breeding Station, Coimbatore, to rust infection was assessed at Coimbatore. All of them were found to be susceptible in varying degrees. Four geographic races of the millet were also found to be susceptible. Among eighteen varieties obtained from Japan, eleven were found to be satisfactory, five of them being immune. Two of them produced good ears and are worth multiplication. The rust did not infect other local species ofSetaria but passed on toEriochloa procera. Juices of garlic and onion inhibited the germination of the urediospores to some extent but not completely.

      We wish to express our indebtedness to the Millets and Pulses Specialist, Coimbatore, the Cytogeneticist, Coimbatore, and the Superintendent, Agricultural Research Station, Hagari, for supplying the seeds of the various cultures. To the Millets Specialist we are further obliged for laying out the field trials. We are thankful to Sri. C. L. Subramaniam for assistance in some of the inoculation experiments.

    • Limb breakage in citrus

      T S Ramakrishnan

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      In several orchards in the districts of North Arcot and Cuddappah limb breakage of oranges and limes has been prevalent in recent years causing damage to the trees in full bearing. This occurs in the months of October to December and is aggravated by strong winds.Trametes cervina is associated with this. This fungus is able to infect the bark and wood through wounds. Eradication of the insects infesting the crotches and painting the bark with Bordeaux mixture are recommended as preventive measures.

    • Effect of growing cotton in rotation with different crops on structure of black cotton soil

      T L Deshpande D K Ballal R J Kalamkar

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      Results of an investigation carried out to study the effect of growing cotton in rotation with juar and groundnut on the structure of black cotton soil are presented and discussed.

      The rotations studied were:—

      1. Cotton grown continuously year after year;

      2. Cotton and juar grown in alternate years; and

      3. Cotton-juar-groundnut in three course rotation.

      Determinations made for evaluation of structure and the ranges of values obtained were:—

      No significant differences in the structural condition of the soil were observed in plots under the three different rotations, both in 0–6″ and 6–12″ layers.

      The lower 6–12″ layer did not show any structural difference from the surface 0–6″ layer.

      None of the standing crops of the year,i.e., cotton, juar and groundnut showed any pronounced effect on the structure of the soil.

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