Summary
The effects of Zn, P, N and CaCO3 on tryptophan concentration in rice grain were studied in greenhouse at Haryana Agricultural University. Zinc application upto 20 ppm increased tryptophan concentration in rice grain. Zn-EDTA gave highest increase followed by ZnSO4 and then ZnO. Liming at the rate of 4 and 8 per cent decreased tryptophan concentration significantly. Phosphorus application upto 100 ppm also decreased tryptophan significantly but Zn in combination with P increased tryptophan and overcame negative effect of P. Nitrogen application upto 120 ppm increased tryptophan concentration. There was positive interaction between Zn and N. Ammonium sulphate gave highest tryptophan followed by ammonium nitrate and then urea.
The tryptophan concentration ranged between 766 ppm and 2011 ppm in paddy grain. The lowest tryptophan concentration was in the plants treated with 8 per cent lime in absence of added Zn and highest with 10 ppm Zn through Zn-EDTA.
This is a preview of subscription content, log in via an institution to check access.
References
Hoagland, D. R. 1944 Chronica Botanica, Walthans, Massachusett.
Nason, A.et al. 1951 J. Biol. Chem.188, 397–406.
Skoog, F. 1940 Am. J. Bot.27, 939–951.
Singh, M. and Singh, S. P. 1981 Plant and Soil62, 183–192.
Singh, M. and Singh, S. P. 1980 Soil Sci.129, 282–289.
Smith, A. M. and Agiza, A. H. 1951 J. Sci. Food Agric.2, 503–520.
Tsui, C. 1948 Am. J. Bot.35, 172–179.
Author information
Authors and Affiliations
Additional information
Department of Soils.
Rights and permissions
About this article
Cite this article
Singh, M. Effect of zinc, phosphorus and nitrogen on tryptophan concentration in rice grains grown on limed and unlimed soils. Plant Soil 62, 305–308 (1981). https://doi.org/10.1007/BF02374094
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02374094