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Subject: Physics × End date: 2019 ×
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    ThesisItemOpen Access
    Estimation of soil thermal properties in long-term zero tillage practice under mungbean-wheat and sorghum-wheat cropping systems
    (CCSHAU, 2019) Mallo Devi; Dahiya, Rita
    Thethermal properties of soil have significanct role on soil productivity and plant growth. Therefore, the present study on “Estimation of soil thermal properties in long-term zero tillage practice under mungbean-wheat and sorghum-wheat cropping systems” was conducted during 2018-19 at Research Farm of Department of Soil Science, CCS HAU, Hisar. The field experiments consisted of three tillage practices viz. CT-CT (Conventional tillage in both kharif&rabi seasons), CT-ZT (Conventional tillage in kharif&zero tillage in rabi seasons) and ZT-ZT (Zero tillage in both kharif& rabi seasons); two cropping systems (sorghum-wheat and mungbean-wheat) and two moisture regimes (IW/CPE = 0.75 and 0.90). Soil physico-chemical properties i.e., soil organic carbon, bulk density, soil moisture contents were measured at 0-5, 5-15 and 15-30 cm depth in all the three tillage practices inboth the cropping systems and moisture regimes. The soil temperatures were measured at 2, 5 and 15 cm depths in all the treatments at different times on different days during the study period. The soil penetration resistance was measured at 20 cm depth in all the three tillage practices under both the moisture regimes in both the cropping systems. The specific heat capacity (0-5, 5-15 and 15-30 cm), thermal diffusivity (0-15 cm) and thermal conductivity (0-15 cm) of soil were determined in all the three tillage practices in both the moisture regimes in both the cropping systems. The zero tillage (ZT-ZT) significantly increased the soil organic carbon upto 30 cm depth as compared to CT-CT in both the cropping systems and moisture regimes. The adoption of zero tillage reduced the bulk density of soil as compared to CT-CT up to 15 cm depth significantly in both the cropping systems and moisture regimes. Penetration resistance of soil was found lowest in ZT-ZT amongst all the tillage practices at 20 cm depth. Zero tillage increased the soil moisture up to 30 cm depth as compared to CT-CT. The specific heat capacity was found highest in ZT-ZT , thermal diffusivity and thermal conductivity was found lowest in ZT-ZT in both the cropping systems in both the moisture regimes. The results indicated that zero tillage has potential to enhance the soil organic carbon, reduce soil compaction and moderate the soil temperature in arid and semi-arid climate conditions.