Influence of deficit irrigation and nano NK application on root dynamics, physiology and WUE of transplanted rice (Oryza sativa)

A  VASUKI; V K  PAULPANDI; A  GURUSAMY; T  SIVAKUMAR; K  PRABAKARAN

doi:10.56093/ijas.v94i4.143367

Authors

A VASUKI Agricultural College and Research Institute (Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu), Madurai, Tamil Nadu 625 104, India
V K PAULPANDI Krishna College of Agriculture and Technology (Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu), Usilampatti, Madurai, Tamil Nadu
A GURUSAMY Agricultural College and Research Institute (Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu), Madurai, Tamil Nadu 625 104, India
T SIVAKUMAR Agricultural College and Research Institute (Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu), Madurai, Tamil Nadu 625 104, India
K PRABAKARAN Agricultural College and Research Institute (Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu), Madurai, Tamil Nadu 625 104, India

https://doi.org/10.56093/ijas.v94i4.143367

Keywords:

Irrigation, Nano NK, Nutrient, Rice, Water use efficiency

Abstract

A field experiment was conducted during the rainy (kharif) (June–September, 2022) and winter (rabi) (December 2022–March, 2023) seasons at Agricultural College and Research Institute (Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu), Madurai, Tamil Nadu to study the effect of irrigation methods and nutrient management strategies on the growth of roots, physiological aspects, yield and water use efficiency of transplanted rice (Oryza sativa L.). Experiment was conducted in a split-plot design comprised of 3 irrigation methods, viz. Irrigation at 15 cm depletion of water level in field water tube (M₁); Alternate wetting and drying (M₂); Conventional flooding (M₃) in main plot and 7 nutrient management strategies, viz. Application of 50% N + nano urea as foliar spray (S₁); 75% N + nano urea as foliar spray (S₂); 50% K + nano potash as foliar spray (S₃); 75% K + nano potash as foliar spray (S₄); 50 and 75% N and K + nano urea and potash as foliar spray (S₅); 100% RDF (S₆); and absolute control (S₇) in sub plot, replicated thrice. Results indicated that under M₁S₂, root characteristics like length, volume and dry weight were notably higher. Physiological attributes such as stomatal conductance, transpiration and photosynthetic rate recorded high with M₂S₅. However, the maximum yield and water use efficiency were observed with M₂S₅. In conclusion, the treatment combination M₂S₅ is considered as practical recommendation for farmers in the Periyar Vaigai command area, ensuring optimal yield while economically utilizing water and fertilizers.

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