D. R. Singh

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No abstract

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D. R. Singh , R. C. Srivastava , R. Raja

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Salinization is a critical issue as it reduces or inhibits plant growth. The degree of salinization depends on the duration of exposure to sea water and the soil type. Remediation will therefore require much more time and inputs. The steps in the reclamation of saltaffected soils include, Leaching/surface flushing of salts and through the use of salt-tolerant crops and varieties and Noni (Morinda citrifolia) has been identified as one of the potential salt tolerant tree species capable of withstanding salinity. Thus an experiment was conducted in a variety of range of salinity to observe its influence on growth and yield of Noni. The results revealed that Noni could grow upto an EC level of 13.5 dSm^-1 with normal flowering and fruiting while the plant exhibited tolerance upto an EC level of 21.3dSm^-1. Hence, Noni has emerged as an important alternative crop in Tsunami affected areas of Andaman and Nicobar Islands. Since this plant tolerates high salinity and tolerant of ocean salt spray the farmers of the coastal regions may be advised to take up its plantations commercially in large scale in saline area and also in the tsunami affected land. As Noni is tolerant of extreme salinity in general and is thought to possibly gain nutritional benefit from the minerals contained in sea water. It is suggested that Noni may play a vital role in giving boost to the economy to the growers and unused land can be made useful by giving clean green environment.

Keywords

Morinda citrifolia (Noni), Salinity, Sea Water, Seedlings, Salt Stress, Tsunami,
Andaman & Nocibar Islands

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D. R. Singh , R. P. Medhi

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Andaman and Nicobar Islands have a vast variety of orchids. There are about 138 orchids distributed in different Islands. Many of the species found here are rare and threatened. Four genera viz., Grossourdya, Macropodanthus, Malleola and Plocobglottis from these islands have so far not been reported from any other parts of India.

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D. R. Singh , R. P. Medhi

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Pteridophytes considered to be a vast group which constitute an important component of forest vegetation. Earlier report had enumerated around 50 species of ferns from South Andaman. In this paper some new species are included which are found in South Andaman.

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R. S. Singh , D. R. Singh

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High valued medicinal plant of Noni (Morinda citrifolia L) were grown in Varanasi (25°18 N 83°01 E) during 2007-09 to assess the agro-climatic potential on the crop cultivation in sub-tropical and dry sub-humid conditions. The germination and emergence of noni seeds at an ambient temperature ranged between 23 and 36°C of September conditions has been studied. Highly significant linear relationships between the leaf tip appearance number (Y) and the heat units (X) was developed: Y = 0.0038X + 0.4823 with cc = 0.998 (significant at 1% level) for the seedling stage of the crop after the emergence. This indicated that the seedlings took about 254°C of growing degree days (GDD) for producing each new leaf tip before its transplantation. The, agro-meteorological measurements visualised that the noni seedlings growth ceased when ambient temperature was either < 12°C or > 40°C under Varanasi conditions. Study also indicated that the leaf tip production was the fastest (156°C leaf) on the plant under partial shading treatment (T2) followed by zero shading (T1) treatment (177°Cd leaf^-1) and partial shading with compact soil (T3) treatment (201°Cd leaf^-1) plants, after the transplantation. Height of the main shoot (MS) of the plants has increased rapidly and measured to highest (4.25m) again under T2 treatment followed by 3.0m under T1 treatment and lowest (2.95m) under T3 treatment at the end of second season (November 2009). Growing period for the noni crop was found nine months (270 days) from March to November. The plant took about 75 to 90 days time and at least 1250 to 1600°C of GDD for proper fruit development and to reach at semi ripening stage in Varanasi area.

Keywords

Noni (Morinda citrifolia L.), Growth and Development, Flowering and Fruit Setting, Ambient Temperature And Relative Humidity

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D. R. Singh , R. C. Srivastava

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Andaman and Nicobar Islands being close to the equator, enjoy tropical humid climate condition, which are much congenial for vegetative and reproductive growth of Morinda citrifolia. Eighty species of Morinda have been reported globally of which, twelve species from different parts of India and three known species found to be in Andaman and Nicobar Islands. Great variability within the species is the common occurrence. Owing to its high nutritive value, medicinal importance and having national and international market, there is a possibility for emerging as one of the most remunerative fruit crop to the island farmers. It flowers and fruiting occurs round the year. Noni plant is distributed in almost all parts of the island. It can be found near the coast, in open lands, and grass lands, in gluches and distributed forest of the dryer areas. It tolerates high soil salinity and brackish water stagnation, therefore, the Morinda citrifolia, is the best choice for planting in these affected lands. Farmers are showing much interest in Noni cultivation because of assured income from this plantation. Therefore, studies on its diversity have to be critically examined for various uses from the different tropical parts of the country.

Keywords

Morinda citrifolia, Andamans And Nicobar Islands, Distribution, Diversity

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I. Jaisankar , V. Damodaran , D. R. Singh , R. Sudha

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no abstract

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D. R. Singh ¹, R. C. Srivastava ¹, Shrawan Singh ¹

Affiliations
1 Central Agricultural Research Institute, Andaman and Nicobar Islands, India, Port Blair-74401, IN

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