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Subject: Agricultural Physics and Meteorology × Author: Virdi, Razdeep Kaur × End date: 2023 × Start date: 2021 × Type: Thesis ×
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    ThesisItemOpen Access
    Water content estimation of direct seeded rice (Oryza sativa L.) using beta radiation
    (Punjab Agricultural University, Ludhiana, 2022) Virdi, Razdeep Kaur; Sharma, Rajeev Kumar
    A field experiment was set up in split-plot design to use the beta radiation for estimating the water content (WC) of direct-seeded rice (Oryza sativa L.). Two varieties of rice PR 129 (V1) and PR 126 (V2) was grown under four irrigation treatments namely, V1I1 = irrigation based on IW/CPE ratio 3.0, V1I2 = irrigation based on IW/CPE ratio of 2.5, V1I3 = irrigation based on IW/CPE ratio of 2.0, V1I4 = irrigation based on IW/CPE ratio of 1.5 with, V2I1 = irrigation based on IW/CPE ratio of 3.0, V2I2 = irrigation based on IW/CPE ratio of 2.5, V2I3 = irrigation based on IW/CPE ratio of 2.0, and V2I4 = irrigation based on IW/CPE ratio of 1.5. 204 Tl has been used as a radioactive source with 0.766 MeV as end point energy. Logarithmic relative intensity versus thickness plots was fitted for the fresh and dry state of rice leaves for all treatments and mass attenuation coefficient (µm) values were used to evaluate WC. It was observed that µm was more for the dry state than for the fresh state of leaves. The findings show that maximum water content was in I4, followed by I3, I1, and minimum in I2 for both varieties. The obtained results of WC using beta attenuation were found in good agreement with the direct weighing method and comparable with relative leaf water content. Also, it was found that the least SDD was shown by I1 irrigation treatment, followed by I4, I3, and maximum SDD was observed in I2 for both varieties. Among the rice cultivar varieties: V1 and V2, minimal SDD was observed in V1. From the findings, it can infer that variety PR 126 (V2) with IW/CPE ratio of 1.5 (I4) is good for direct-seeded rice cultivar in the present study from more productivity. The beta attenuation technique is useful in WC estimation and can be effectively used in irrigation scheduling to conserve water.