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Subject: Mathematics × Author: Akshdeep Kaur ×
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    ThesisItemOpen Access
    Estimation of water content in wheat (Triticum aestivum L.) using beta radiations and plant water indices
    (Punjab Agricultural University, Ludhiana, 2019) Akshdeep Kaur; Sharma, Rajeev Kumar
    A field experiment was set up in split-plot design to use beta attenuation technique for estimation of water content (WC) of wheat (Triticum aestivum L.). Wheat cultivar PBW 550 Unnat was grown having two nitrogen contents i.e. 120 kg ha-1 (N1) and 150 kg ha-1 (N2) each under different irrigation regimes viz., irrigation at critical stages (I1), based on IW/CPE ratio of 0.9 (I2) and water stress conditions (I3) that were replicated thrice. 204Tl has been used as radioactive source with 0.766 MeV as end point energy. Logarithmic relative intensity versus thickness curves are plotted for fresh and dry state of wheat leaves for all treatments and mass attenuation coefficient (μm) values are used to evaluate WC. It is observed that μm is more for dry leaves than for fresh leaves. Maximum WC is found in I1 followed by I2 and minimum is in I3 for both nitrogen levels. Also, results of WC using beta attenuation are found in good agreement with direct weighing method and comparable with relative leaf water content. Stress degree days is evaluated and found minimum for N2I2 treatment. Also, the highest grain yield is obtained for N2I2 treatment. Study revealed that increasing N content can reduce stress due to more temperature and less irrigation. Considering the results, it can be inferred that N2I2 treatment would be best management intervention for wheat cultivation. Beta attenuation technique is found useful for estimation of WC and can effectively be used in irrigation scheduling for saving of water.