Evaluation of CENTURY Model for Soil Organic Carbon Assessment at Different Cropping Patterns in Semi-Arid Subtropical India

Naorem J. Singh, M. Kudrat, K. Jain

Abstract


The CENTURY model was evaluated for its ability to simulate soil organic carbon (SOC) changes at different cropping patterns of Uttar Pradesh. A long-term fertilizer trial on rice–wheat system at Ludhiana, Punjab was used for the necessary parameters needed to run Century. This trial was conducted at semi-arid subtropical (mean annual rainfall 800 mm, mean temperature 6.7-35°C) with different treatment combinations. The modeling efficiency (ME) of this trail was 0.87, 0.93 and 0.97 for the treatments wheat straw (WS)+Urea-N (amount of added NPK: 176, 3.3, 61 kg ha-1) (T4), WS+ green manure (GM)+Urea-N (amount of added NPK: 176, 3.3, 61 kg ha-1) (T5) and farm yard manure (FYM)+GM (amount of added NPK: 186, 35, 81 kg ha-1) (T7) respectively and r2 for all treatments was more than 0.9. The SOC storage at different cropping systems was found in the following order: rice-wheat> sugarcane- wheat > maize-wheat > jowar-pulses/ oilseed. The anaerobic part of rice-wheat system and minimum tillage practices under sugarcane- wheat system might enhance the SOC storage at the similar agro-climatic condition.

Keywords


Biomass; Century Model; Rice-wheat; Long Term Experiment; Minimum Tillage Practices

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