Shaukat, M.; Hoshide, A.K.; Muhammad, S.; Arshad, I.A.; Mushtaq, M.; de Abreu, D.C. Predicting Soil Carbon Sequestration and Harvestable C-Biomass of Rice and Wheat by DNDC Model. Crops2023, 3, 220-240.
Shaukat, M.; Hoshide, A.K.; Muhammad, S.; Arshad, I.A.; Mushtaq, M.; de Abreu, D.C. Predicting Soil Carbon Sequestration and Harvestable C-Biomass of Rice and Wheat by DNDC Model. Crops 2023, 3, 220-240.
Shaukat, M.; Hoshide, A.K.; Muhammad, S.; Arshad, I.A.; Mushtaq, M.; de Abreu, D.C. Predicting Soil Carbon Sequestration and Harvestable C-Biomass of Rice and Wheat by DNDC Model. Crops2023, 3, 220-240.
Shaukat, M.; Hoshide, A.K.; Muhammad, S.; Arshad, I.A.; Mushtaq, M.; de Abreu, D.C. Predicting Soil Carbon Sequestration and Harvestable C-Biomass of Rice and Wheat by DNDC Model. Crops 2023, 3, 220-240.
Abstract
Biogeochemical models estimate soil organic carbon (SOC) sequestration, crop growth, and yield. The DeNitrification and DeComposition (DNDC) model was used to simulate soil SOC dynamics and harvested C-biomass in rice-wheat rotation under organic/inorganic fertilizations with conventional tillage (CT) and reduced tillage (RT). Before calibration, DNDC under-predicted harvestable grain C-biomass of rice by 29.22% to 42.14% and over-simulated grain C-biomass of wheat by 55.01% with equal amounts of NPK and animal manure applied under CT. However, after calibration by adjusting default values of soil/crop parameters, DNDC simulated harvestable grain C-biomass of both crops very close to observed values (only -2.81% to -6.17% less). DNDC also predicted effects of nutrient management practices on grain C-biomass of rice/wheat under CT/RT using d-index (0.76 to 0.96) and the calculated root mean squared error (RMSE of 165.36 to 494.18 kg C ha-1). DNDC simulated SOC trends for rice-wheat using measured values of several statistical indices. Regression analysis between modeled and observed SOC dynamics was significant with R2 ranging from 0.35 to 0.46 (p < 0.01), and intercept ranging from 0.30 to 1.34 (p < 0.65). DNDC demonstrated that combined inorganic and organic fertilization may result in higher C-biomass and more SOC sequestration in rice-wheat systems.
Biology and Life Sciences, Agricultural Science and Agronomy
Copyright:
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