Rust of Queensland arrowroot (Canna edulis) caused by Puccinia thaliae: a new record for India     

M. L. Jeeva  V. Hegde  T. Makeshkumar  S. Sriram  R. R. Nair  S. Edison  N. Mathur 《Plant pathology》2004,53(2):261-261

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Dioscorea alata, a new host of Sclerotium rolfsii in India     

M. L. Jeeva  V. Hegde  T. Makeshkumar  R. R. Nair  S. Edison 《Plant pathology》2005,54(4):574-574

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P. K. R. Nair 《Agroforestry Systems》2001,51(3):253

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Alkaloids from Cyrtanthus elatus     

Herrera MR  Machocho AK  Nair JJ  Campbell WE  Brun R  Viladomat F  Codina C  Bastida J 《Fitoterapia》2001,72(4):444-448

The alcoholic extract of the fresh bulbs of Cyrtanthus elatus yielded zephyranthine (1) and 1,2-O-diacetylzephyranthine (2), together with three other known alkaloids. Complete assignment of 1H and 13C NMR spectra of compounds 1 and 2 was done by employment of two-dimensional NMR techniques.  相似文献   

    

P. K. R. Nair 《Agroforestry Systems》2002,54(3):255

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Agroforestry as an approach to minimizing nutrient loss from heavily fertilized soils: The Florida experience     

Nair  V.D.  Graetz  D.A. 《Agroforestry Systems》2004,61(1-3):269-279

Agroforestry Systems - Nutrient buildup in the soil caused by increased animal manure and fertilizer use in agricultural and forestry practices may increase the potential for their loss from the...  相似文献   

Book reviews     

Reinhold G. Muschler  P. K. R. Nair 《Agroforestry Systems》1995,31(1):93-96

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The agroforestry systems database at ICRAF     

P. A. Oduol  P. Muraya  E. C. M. Fernandes  P. K. R. Nair  A. Oktingati  J. maghembe 《Agroforestry Systems》1988,6(1):253-270

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Forest villages: an agroforestry approach to rehabilitating forest land degraded by shifting cultivation in Thailand     

S. A. Boonkird  E. C. M. Fernandes  P. K. R. Nair 《Agroforestry Systems》1985,2(2):87-102

The Forest village scheme was introduced by the Forest Industries Organisation (FIO) of Thailand in 1967 as an attempt to stop further spread of the fast increasing shifting cultivation and deforestation in the country. The underlying princple of the scheme is to relate reforestation with social welfare of the people involved. It is essentially a modification of the traditional taungya method of plantation establishment.The salient aspect of the scheme is to induce the shifting cultivators to settle down in villages where each family is given tenure over a plot of land to construct a house and develop a homegarden around it. The farmers are required to help establish and maintain forest plantations, in which they are permitted to raise agricultural crops during the first three years of its establishment. The farmers are also given free medical and educational facilities, and technical advice on crop and livestock husbandry. They can also earn cash rewards for successful plantation establishment.Although the scheme has not achieved its full target in terms of area covered and number of families settled, it is proving to be a successful method of luring people away from destructive shifting cultivation. The approach is applicable to other countries and regions with similar land-use problems and socio-cultural background.The paper also examines the constraints to the effective working of the scheme, provides some simple suggestions for improving its functioning and identies some of the issues that can easily be tackled by research.  相似文献   

Litter dynamics of six multipurpose trees in a homegarden in Southern Kerala, India     

Sheeba Rebecca Isaac  M. Achuthan Nair 《Agroforestry Systems》2006,67(3):203-213

Multipurpose trees, the integral components of homegardens, contribute significantly to the closed nutrient cycling processes and sustainability of the ecosystem. Although, the litter production and probable nutrient returns via litter in homegardens have been documented, quantification and characterization of the decomposition and bioelement release from the litter have received relatively little scientific attention. The objective of the present study is to explore the litter dynamics of six locally important multipurpose trees (Mangifera indica L., Artocarpus heterophyllus Lamk., Anacardium occidentale L., Ailanthus triphysa Dennst., Artocarpus hirsutus L. and Swietenia macrophylla L.), in an agroforestry homegarden in Southern Kerala, India. Litterfall and nutrient additions in the six species ranged from 383 to 868 g m⁻² yr⁻¹, nitrogen, 6.4 to 8.8, phosphorus, 0.17 to 0.42 and potassium, 1.1 to 2.8 g m⁻² yr⁻¹. The annual litter output in the homegarden was 425 kg with A. hirsutus, M. indica, A. heterophyllus and A. occidentale recording significantly higher litter and nutrient additions. Leaf litter decay studies revealed A. heterophyllus and A. occidentale to be the most labile litter species and S. macrophylla the most recalcitrant. The decay rate coefficients varied significantly among the species. Foliage decomposition rates related to the initial chemical composition of the litter revealed best correlation with lignin. NPK release was almost complete by the end of decay in all species inspite of the initial phases of accumulation observed for nitrogen and phosphorus. Two-way analysis of variance test revealed significant differences in the contents of the three elements as a function of species and time elapsed. Macronutrients were released in the order K>N/P. The higher rates of decay and nutrient turnover in M. indica, A. heterophyllus and A. occidentale foliage indicated the potential of using these species’ litter as nutrient inputs in agriculture while A. triphysa, A. hirsutus and S. macrophylla perform better as organic mulches taking a longer time for decay and hence nutrient release.  相似文献