Source-sink optimization and morpho-physiological response of soybean [Glycine max] to detopping and mepiquat chloride application

DOI: 10.18805/LR-3971    | Article Id: LR-3971 | Page : 401-407
Citation :- Source-sink optimization and morpho-physiological response of soybean [Glycine max] to detopping and mepiquat chloride application.Legume Research-An International Journal.2020.(43):401-407
Manpreet Jaidka, J.S. Deol, Ramanjit Kaur and R. Sikka ramaan180103@yahoo.com
Address : Punjab Agricultural University, Ludhiana-141 004, Punjab, India.
Submitted Date : 1-12-2017
Accepted Date : 19-05-2018

Abstract

Effect of detopping and mepiquat chloride on morphological, physiological and yield attributes of soybean cultivar ‘SL 544’ was studied. A two year investigation was conducted at Punjab Agricultural University, Ludhiana, during kharif seasons of 2014 and 2015. The experiment was laid-out in randomized complete block design (RCBD) with eight treatments viz. control, detopping (removal of 4-5 cm apical portion of main stem) at 50-55 days after sowing (DAS), mepiquat chloride @ 200 ppm (50-55 DAS), mepiquat chloride @ 200 ppm (50-55 + 65-70 DAS), mepiquat chloride 250 ppm (50-55 DAS), mepiquat chloride @ 250 ppm (50-55 + 65-70 DAS), mepiquat chloride @ 300 ppm (50-55 DAS) and mepiquat chloride @ 300 ppm (50-55 + 65-70 DAS) with four replications. Detopping had a non-significant effect on leaf area index, SPAD value, PAR interception, abscission of reproductive parts, seeds per pod, 100-seed weight, pod length and stover yield of soybean. It significantly decreased plant height, increased total dry matter accumulation/plant, number of flowers and pods/plant, pod setting percentage and seed yield over control during 2014 and 2015. At crop harvest, detopping developed optimized source-sink relationship by means of distribution of total dry matter between stem, foliage and pods by 20.4, 14.9 and 64.6 % during 2014 while 22.6, 20.1 and 57.4 % during 2015, respectively. Mepiquat chloride posed a non-significant effect on plant height, PAR interception, number of flowers/plant, number of seeds/pod, pod length and stover yield of soybean but it significantly decreased leaf area index, abscission of reproductive parts while increased the dry matter accumulation/plant, number of pods/plant, 100-seed weight and seed yield relative to control. At harvest, two foliar applications of mepiquat chloride @ 250 ppm resulted in optimized source-sink relationship by the distribution of total dry matter among stem, foliage and pods by 20.6, 10.9 and 68.5 % during 2014 while 19.5, 7.6 and 72.9 % during 2015, respectively. Occurrence of more rainfall during 2015 as compared to 2014 caused mepiquat chloride to hike seed yield as compared to detopping which is clearly witnessed by increase in pod dry weight per plant during 2015 than 2014. Conclusively, both detopping and mepiquat chloride resulted in enhancement in source-sink relationship and seed yield of soybean.     

Keywords

Detopping Mepiquat chloride Seed yield Source-sink optimization Soybean.

References

  1. Akinrinde. (2006) Growth regulators and nitrogen fertilization effects on performance and nitrogen-use efficiency of tall and dwarf varieties of rice (Oryza sativa L.). Biotechnology, 5:268–276.
  2. Ananthi, K. and Vanagamudi, M. (2013). Physiological manipulation for enhancing productivity in mungbean (Vigna radiata) with value added humic acid. Journal of Food Legume, 26:75-78.
  3. Arora, N., Bansal, A. and Kaur, J. (2005). Effect of mepiquat chloride and gibberellic acid on the yield attributes of soybean (Glycine max L. Merrill). Journal of Research Punjab Agricultural University, 42:58-61.
  4. Godara, A.S., Singh, R., Chouhan, G.S. and Nepalia, V. (2017). Yield and economics of fenugreek (Trigonella foenum- graecum L.) as influenced by fertility levels, biofertilizers and brassinosteroid. Legume Research, 40:165-169.
  5. Kaur, J., Ram, H., Gill, B.S. and Kaur, J. (2015). Agronomic performance and economic analysis of soybean (Glycine max) in relation to growth regulating substances in Punjab, India. Legume Research, 38:603-608.
  6. Kaur, J., Singh, P. and Parmar, U. (2006). Response of mungbean (Vigna radiata L.) to exogenous application of sodium nitroprusside (SNP-NO releasing compound). Environmental Ecology, 24:187-189.
  7. Kumar, K.A.K., Ravi, R., Patil, B.C. and Chetti, M.B. (2006). Influence of plant growth regulators on morpho-physiological traits and yield attributes in hybrid cotton (DHH-11). Annals of Biology, 22 :53-58.
  8. Prakash, R. and Prasad, M. (2000). Effect of nitrogen, chlormequat chloride, farmyard manure applied to cotton (G. hirsutum) and their residual effect on succeeding wheat crop. Indian Journal of Agronomy, 45 :263-268.
  9. Reddy, P., Ninganur, B.T., Cheti, M.B. and Hiremath, S.M. (2009). Effect of growth retardants and nipping on chlorophyll content, nitrate reductase activity, seed protein content and yield in cowpea (Vigna unguiculataL.). Karnataka Journal of Agricultural Sciences, 22:289-292.
  10. Sharma, P., Sardana, V. and Kandhola, S.S. (2013). Dry matter partitioning and source-sink relationship as influenced by foliar sprays in groundnut. Bioscan, 8:1171-1176.
  11. Shyam, C. (2016). Crop growth regulation and defoliation in summer greengram [Vigna radiata (L.) Wilczek.] for synchronized maturity. M.Sc Thesis. Punjab Agricultural University, Ludhiana, India.
  12. Sandhu, M.S., Deol, J.S. and Brar, A.S. (2015). Effect of growth regulation on growth and yield attributes of summer mungbean [Vigna radiata (L.) Wilczek]. Crop Research, 49:18-22.
  13. Singh, M.S. and Devi, K.S. (2006). Profitability of nipping in cultivation of pea (Pisum sativum)-an indigenous agro-technique in Manipur. Indian Journal of Agronomy, 51:206-208 

Global Footprints