Agricultural Research

, Volume 7, Issue 2, pp 215–224 | Cite as

Optimizing Dosage and Mode of Potassium Application for Rice in Drought-Prone Rainfed Ecology of Middle Indo-Gangetic Plains

  • Santosh Kumar
  • S. K. Dwivedi
  • K. K. Rao
  • J. S. Mishra
  • A. K. Singh
  • Narayan Bhakta
  • Ved Prakash
  • Shishir Kant Singh
  • Virendar Kumar
  • B. P. Bhatt
Full-Length Research Article


A field experiment was undertaken during wet seasons of 2014 and 2015 to evaluate the response of soil-applied potassium (K), and its additional foliar application in rice (Sahbhagi Dhan) under drought-prone rainfed lowland ecology of eastern India. Three K2O doses (20, 30, 40 kg ha−1) were soil applied alone, and also supplemented with two levels of foliar sprays (0.50 and 1.0% K, separately) at panicle initiation stage. The results indicated that growth and yield of rice were adversely affected in the absence of extraneous application of potassium in drought-prone environment. Under drought, K management practices significantly influenced grain yield and B:C ratio, recording its maximum (3.92 t ha−1 and 1.43) with 20 kg K2O ha−1 basal application + one foliar spray @ 1.0% K at PI stage which was at par with 40 kg K2O ha−1 basal application compared to control (3.25 t ha−1 and 1.22). Moreover, foliar application of potassium significantly improved the gas exchange process (Pn rate), water status in terms of RWC and chlorophyll content and TSS. Extraneous application of K, across different doses, application schedules and methods maintained higher K content in straw as well as in grain as compared to control. Our finding strongly suggests that split application of K is highly beneficial for improving nutritional quality without significantly declining yield under drought-prone ecology of rice where K is limiting factor.


Drought Foliar spray K management Rice Split application Potassium Gas exchange Chlorophyll 



The authors duly acknowledge Bill and Melinda Gates Foundation (BMGF) for providing funds through IRRI-IRRAS Project for successful completion of present study.


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Copyright information

© NAAS (National Academy of Agricultural Sciences) 2018

Authors and Affiliations

  1. 1.Division of Crop ResearchICAR Research Complex for Eastern RegionPatnaIndia
  2. 2.Chaudhary Charan Singh Haryana Agricultural UniversityHisarIndia

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