Abstract
Yield datasets of long-term experiments on integrated nutrient management in rice-rice cropping systems were used to investigate the relationship of variability in rainfall, temperature, and integrated nutrient management (INM) practices in rice-rice cropping system in three different agroecological regions of India. Twelve treatments with different combinations of inorganic (chemical fertilizer) and organic (farmyard manure, green manure, and paddy straw) were compared with farmer’s conventional practice. The intraseasonal variations in rice yields are largely driven by rainfall during kharif rice and by temperature during rabi rice. Half of the standard deviation from the average monthly as well as seasonal rainfall during kharif rice and 1 °C increase or decrease from the average maximum and minimum temperature during rabi rice has been taken as the classification of yield groups. The trends in the date of effective onset of monsoon indicate a 36-day delay during the 30-year period at Rajendranagar, which is statistically significant at 95 % confidence level. The mean annual maximum temperature shows an increasing trend in all the study sites. The length of monsoon also showed a shrinking trend in the rate of 40 days during the 30-year study period at Rajendranagar representing a semiarid region. At Bhubaneshwar, the application of 50 % recommended NPK through chemical fertilizers and 50 % N through green manure resulted in an overall average higher increase of 5.1 % in system productivity under both excess and deficit rainfall years and also during the years having seasonal mean maximum temperature ≥35 °C. However, at Jorhat, the application of 50 % recommended NPK through chemical fertilizers and 50 % N through straw resulted in an overall average higher increase of 7.4 % in system productivity, while at Rajendranagar, the application of 75 % NPK through chemical fertilizers and 25 % N through green manusre resulted in an overall average higher increase of 8.8 % in system productivity. This study highlights the adaptive capacity of different integrated nutrient management practices to rainfall and temperature variability under a rice-rice cropping system in humid, subhumid, and semiarid ecosystems.
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Acknowledgements
The authors are grateful to Indian Council of Agricultural Research for providing the necessary funds under the National Initiative on Climate Resilient Agriculture (NICRA) project to carry out this study. The authors are also thankful to Chief Agronomists of Bhubaneshwar, Jorhat, and Rajendranagar for their efforts to conduct these experiments under the egis of All India Coordinated Research Project on Farming Systems Research of Indian Council of Agricultural Research.
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Subash, N., Gangwar, B., Singh, R. et al. Identification of climate-resilient integrated nutrient management practices for rice-rice cropping system—an empirical approach to uphold food security. Int J Biometeorol 59, 65–78 (2015). https://doi.org/10.1007/s00484-014-0825-5
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DOI: https://doi.org/10.1007/s00484-014-0825-5