• Anil Kumar

      Articles written in Proceedings – Plant Sciences

    • Some observations on interspecific hybrids ofSolanum melongena L.

      G R Rao Anil Kumar

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      Cytomorphological characters ofSolanum indicum L. andS. melongena L., and of their hybrids (F1) were studied. The hybrids were fertile with mostly normal meiosis. It is concluded from cytology of the hybrids that small structural differences exist between the chromosomes of the parents. The potential ability of the parents to produce new recombinations inF2 is discussed. The conflicting observations of different workers on these species crosses are likely due to occurrence of variability in genetic architecture ofS. indicum andS. melongena. The plants ofF2 progeny were tested againstFusarium oxysporum,Phomopsis vexans andLeucinodes orbonalis. The plants found to be resistant were used in the study and from the subsequent studies a large population ofF4 generation was raised with desirable agricultural features.

    • Cytology ofSolanum nigrum L.,S. retroflexum Dunn. and their hybrids

      G R Rao Anil Kumar

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      Cytomorphological characters ofSolanum retroflexum and tetraploidS. nigrum, and theirF1 hybrids were studied. The hybrids were fertile with highly regular meiosis. It is concluded that the species are differentiated primarily by genetic factors. The origin of the two species from the same or identical ancestors is discussed.

    • Ecological implications of some cash crop ecosystems in north-eastern India

      Anil Kumar P S Ramakrishnan

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      Energy and economic analysis of cash crops (coffee, tea, ginger and pineapple mixed cropping system) are contrasted with shifting agriculture under a 10-yr cycle in north-eastern India. Though ginger gave maximum monetary return, followed by tea, the output/input ratio was higher for pineapple mixed cropping system. Coffee is not successful in this area of study. Some of the cash crop systems had high energy efficiencies though the shifting agriculture had high output/input ratio of 43·5. Nutrient losses through water was high under cash crops with maximal losses under ginger; compared to shifting agriculture the losses were substantial. It is suggested that plantation crops should be sustained in the region basing it, to the extent possible, on the concept of recycling of organic wastes.

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