Climatic changes and increasing climatic variability’s are likely to aggravate the problems of future food security by exerting pressure on agriculture. A field experiment was conducted with Cowpea (Vigna unguiculata) to assess the impact of increased temperature in polyhouse with three different treatment’s viz; 100% organic, 100% inorganic, and 50% organic + 50% inorganic nutrient management on growth, yield and carbon dioxide (CO2) evolution compared to that of open natural condition. The results showed that crop production declined with increase in temperature and the mean root and shoot weight were higher in the case of open cultivated plants over the polyhouse cultivated plants. In the case of nutrient management practices, the maximum yield was with 100% application of inorganic fertilizers under open cultivated conditions whereas under polyhouse conditions, higher yield was obtained with 100% application of organic manures. Among the different treatments applied, 100% application of organic manure resulted in maximum carbon dioxide emission in open conditions with 654 mg, whereas polyhouse showed 316 mg only. The lowest value of CO2 evolution of 277 mg was observed with 50% of organic manure + 50% of inorganic fertilizer’s application of fertilizers under open conditions. In all the three nutrient management treatments, the CO2 evolution (mg) reached plateau and stabilized over the last two observations. At the last interval, CO2 evolution had the values from 4.00 to 6.80 mg of CO2 in all the treatments. Cumulative CO2 evolution (mg) showed that the emission was higher under open natural conditions when compared to the polyhouse conditions at elevated temperature and this indicated that the microbial respiration was higher under natural conditions. Ambient air temperature and soil temperature was higher under polyhouse conditions than that of open natural conditions. However, soil moisture was higher under open conditions than the polyhouse conditions in most of the observations. Based on the studied parameters, it is suggested that enough mitigation strategies need to be adopted for sustaining the crop production under changing climatic scenario.
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The authors are indebted to the Executive Director of the Centre for providing the necessary support and assistance throughout the period of study which made it possible to complete the work systematically. Authors also gratefully acknowledging the funding support from the Department of Environment and Climate Change (DoECC), Government of Kerala.
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Vijayan, A.K., Surendran, U., Bujair, V. et al. Influence of Increased Temperature Along with Nutrient Management Treatments on CO2 Emission and Crop Productivity of Cowpea in Polyhouse Conditions Vs Natural Open Conditions Under Changing Climate Scenario. Int. J. Plant Prod. 12, 107–114 (2018). https://doi.org/10.1007/s42106-018-0011-5
- Climate change
- Crop productivity
- Global warming
- CO2 evolution