Agronomic measures to improve thermal energy utilization by spring sunflower (Helianthus annuus L.) BUTA

Authors

  • BUTA SINGH DHILLON Department of Agronomy, Punjab Agricultural University, Ludhiana, India
  • P.K. SHARMA Department of Agronomy, Punjab Agricultural University, Ludhiana, India
  • P.K. KINGRA School of Climate Change and Agricultural Meteorology, Punjab Agricultural University, Ludhiana-141004

DOI:

https://doi.org/10.54386/jam.v19i1.752

Keywords:

GDD,, Helianthus annuus, HUE,, Sunflower

Abstract

Investigations were conducted to study the thermal energy utilization by sunflower during spring 2014 and 2015 at Punjab Agricultural University, Ludhiana, Punjab, India. Experiments were laid out with three sowing dates (January 20, February 10 and March 2), two intra rowspacing (30 and 24 cm) and four nitrogen doses (0, 45, 60 and 75 kg ha-1). The results indicated that early sowing and application ofnitrogen significantly increased number of days to attain physiological maturity. The thermal units required to attain various phenological stages also increased progressively as the sowing was delayed. However, effect of sowing date was not conspicuous onaccumulated growing degree days (AGDD) to attain physiological maturity. Widely sown crop required slightly more AGDD than closely sown for attaining physiological maturity. Application of nitrogen also increased the AGDD. Heat use efficiency followed the descending order with each successive delay in sowing.Seed filling duration had highly significant (P<0.01) positive correlation and regression with seed yield, indicating that with each unit increase in seed filling duration, seed yield increased by 91.3 units.

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Published

01-03-2017

How to Cite

BUTA SINGH DHILLON, P.K. SHARMA, & P.K. KINGRA. (2017). Agronomic measures to improve thermal energy utilization by spring sunflower (Helianthus annuus L.) BUTA. Journal of Agrometeorology, 19(1), 34–38. https://doi.org/10.54386/jam.v19i1.752

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Section

Research Paper

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