Plant Soil Environ., 2014, 60(8):351-357 | DOI: 10.17221/46/2014-PSE

Yield trends and nutrient budgeting under a long-term (28 years) nutrient management in rice-wheat cropping system under subtropical climatic conditionOriginal Paper

A. Das1, R.P. Sharma2, N. Chattopadhyaya1, R. Rakshit1
1 Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Bhagalpur, Bihar, India
2 Department of Agronomy, Bihar Agricultural University, Bhagalpur, Bihar, India

We measured the long-term (28 years) sustainability of rice-wheat cropping system under integrated nutrient management practices emphasizing the trends in grain yields, sustainable yield index (SYI) and nutrient budgeting. The data of long-term experiment revealed that grain yield of both rice and wheat declined under control and sub-optimal fertilizer inputs (50% or 75% recommended fertilizer NPK). Negative yield trend (slope) was observed in control plots for rice (-0.0296) and wheat (-0.0070); whereas positive yield trend was observed under treatments receiving organic supplements. The SYI values indicate that rice yields are more sustainable than wheat. Data on apparent nutrient balance showed a deficit of N (-42.2 kg/ha/year), P (-9.1 kg/ha/year) and K (-52.2 kg/ha/year) under control plots. Surprisingly, there was net depletion of K under the organic supplemented plots. Correlation study revealed that apparent balance of K was negatively correlated with SYI (r = -0.921 for rice; r = -0.914 for wheat) and yield slope (r = -0.870 for rice; r = -0.896 for wheat). If the trend of K imbalance is not reversed, the potential to improve N and P fertilizer use efficiency and crop yields will be limited.

Keywords: apparent nutrient balance; K imbalance; sustainable yield index; organics; ustochrept

Published: August 31, 2014  Show citation

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Das A, Sharma RP, Chattopadhyaya N, Rakshit R. Yield trends and nutrient budgeting under a long-term (28 years) nutrient management in rice-wheat cropping system under subtropical climatic condition. Plant Soil Environ. 2014;60(8):351-357. doi: 10.17221/46/2014-PSE.
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