Abstract
Mustard is cultivated throughout the world for oil in its seeds. Itrequires high nitrogen input for improved productivity but the nitrogen appliedto the soil is not fully utilised by the crops due to various constraints. Theobjective of the reported research was to determine if foliar- appliedgibberellic acid (GA3) could enhance crop growth and increasenitrogen-use efficiency. A field experiment was conducted during 1997–98in which GA3 (10−5 M) was applied tofoliage at 40d after sowing (pre-flowering) to mustard grown with 0, 40(sub-optimal), 80 (optimal) and 120 (supra-optimal) kgN ha−1. Foliar spray of GA3 was effectiveonly when plants received sufficient N (80 kgN ha−1). GA3 sprays significantly enhancedplant dry mass, leaf area, carbon dioxide exchange rate, plant growth rate,cropgrowth rate and relative growth rate. GA3 -treated plants showedenhanced nitrogen-use efficiency through redistribution of N to seeds.
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References
AOAC 1980. Official Method of Analysis. Association of Official Analysis Chemists, Washington DC, USA.
Carvalho M. and Basch G. 1996. Optimisation of nitrogen fertilization: Relationship between precipitation and expected yields. Fertilizer Res. 43: 127–130.
De-La-Guardia M.D. and Benlloch M. 1980. Effect of potassium and gibberellic acid on stem growth of whole sunflower plants. Phys. Plant 49: 443–448.
Donald C.M. 1968. The breeding of crop ideotypes. Euphytica 17: 385–403.
Fiez T.E., Miller B.C. and Pan W.L. 1994. Assessment of specially variable nitrogen fertilizer management in winter wheat. J. Prod. Agric. 7: 86–94.
Gajri P.R., Prihar S.S. and Arora V.K. 1993. Independence of nitrogen and irrigation effects on growth and input-use efficiencies in wheat. Field Crops Res. 31: 71–86.
Gardner J.C., Maranville J.W. and Paparozzi E.T. 1994. Nitrogen use efficiency among diverse sorghum cultivars. Crop Sci. 34: 728–733.
Gomez K.A. and Gomez A.A. 1984. Statistical Procedure for Agricultural Research. Wiley International Publishers, New York.
Greenwood D.J. 1982. Nitrogen supply and crop yield. The global scene. Plant Soil 67: 45–59.
Gunderson C.A. and Taylor G.E. Jr 1988. Kinetics of inhibition of foliar exchange by exogenous ethylene: an ultrasensitive response. New Phytol. 110: 517–524.
Khan N.A. 1996. Response of mustard to ethrel spray and basal and foliar application of nitrogen. J. Agron Crop. Sci. 176: 331–334.
Khan N.A., Ansari H.R. and Mobin M. 1996. Effect of gibberellic acid and nitrogen on carbonic anhydrase activity and mustard biomass. Biol. Plant 38: 601–603.
Khan N.A., Ansari H.R. and Samiullah 1997. Effect of gibberellic acid spray and basal nitrogen and phosphorus on productivity and fatty acid composition of rapeseed-mustard. J. Agron Crop. Sci. 179: 29–33.
Khan N.A., Ansari H.R. and Samiullah 1998. Effect of gibberellic acid spray during ontogeny of mustard on growth, nutrient uptake and yield characteristics. J. Agron Crop. Sci. 181: 61–63.
Milthorpe F.L. and Moorby J. 1979. An Introduction to Crop Physiology. Cambridge University Press, London.
Moll R.H., Kamprath E.J. and Jackson W.A. 1982. Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization. Agron J. 74: 562–564.
Roth-Bejerano N. and Lips S.H. 1970. Hormonal regulation of nitrate reductase activity in leaves. New Phytol 69: 165–169.
Saran B. and Mehta A.S. 1985. Effect of growth regulators on the growth and yield of mustard. Geobios 12: 24–25.
Sowers K.E., Pan W.L., Miller B.C. and Smith J.L. 1994. Nitrogen use efficiency of split nitrogen application in soft white winter wheat. Agron J. 86: 942–948.
Wasnik K.G. and Bagga A.K. 1992. Effect of cycocel on nitrate reductase activity and grain yield in mung bean. Indian J. Plant Phys. 35: 104–107.
Watson D.J. 1952. The physiological basis of variation in yield. Ad Agron 4: 101–145.
Watson D.J. 1958. The dependence of net assimilation rate on leaf area index. Ann Bot. 22: 37–54.
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Khan, N., Mir, R., Khan, M. et al. Effects of gibberellic acid spray on nitrogen yield efficiency of mustard grown with different nitrogen levels. Plant Growth Regulation 38, 243–247 (2002). https://doi.org/10.1023/A:1021523707239
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DOI: https://doi.org/10.1023/A:1021523707239