Browsing by Author "ALKA RANI"
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ThesisItem Open Access MODELLING EVAPOTRANSPIRATION AND NITROGEN UPTAKE IN WHEAT CROP UNDER TILLAGE, RESIDUE AND NITROGEN MANAGEMENT(DIVISION OF AGRICULTURAL PHYSICS ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI, 2016) ALKA RANI; K. K. BandyopadhyayField experiments were conducted during rabi season for two years (2014-15 and 2015-16) on wheat cultivar HD2967 in a sandy loam soil at the research farm of the Indian Agricultural Research Institute, New Delhi with the objectives:(i) To study the effect of tillage, residue and nitrogen management on water and nitrogen dynamics in soil; (ii) To evaluate the effect of tillage, residue and nitrogen management on evapotranspiration, nitrogen uptake and crop yield, and (iii) To simulate the evapotranspiration, nitrogen uptake and yield of wheat under different tillage, residue and nitrogen management practices. The treatments comprising of two levels of tillage as main plot factor (Conventional tillage (CT) and No Tillage (NT)), two levels of residue as subplot factors (Maize residue @ 5t/ha (R+) and without residue (R0)), and three levels of Nitrogen as sub-sub plot factors (60, 120 and 180 kg N/ha, representing 50% (N60), 100% (N120) and 150% (N180) of the recommended dose of nitrogen for wheat, respectively) were evaluated in a split-split plot design with three replications. The results showed that there was increase in the profile moisture storage under crop residue mulch. The evaporative flux was lower but deep percolation flux was higher under mulching than un-mulch treatment. The NH4 + -N and NO3 - -N content increased due to mulching and increase in N levels in all soil depths. There was no significant difference between tillage and crop residue mulch with respect to grain and biomass yield of wheat but it increased with increase in the N levels. The WUE of wheat was not influenced by tillage but increased significantly with the increase in N levels. During high rainfall years the effect of crop residue mulch on WUE was not significant but it increased significantly during low rainfall years. There was no significant effect of tillage and residue mulch on N uptake, grain protein content, Partial factor productivity of Nitrogen (PFPN) and Nitrogen Utilization Efficiency (NUtE) but nitrogen uptake and grain protein content increased significantly with increase in the nitrogen levels whereas PFPN and NUtE decreased significantly with increase in the nitrogen levels. Crop simulation model DSSAT could satisfactorily simulate grain yield, biomass yield, seasonal ET and N uptake in wheat but could not simulate WUE and NUtE of wheat under different tillage, residue and nitrogen management with acceptable level of accuracy.