Relative efficiency of diammonium phosphate and mussoorie rock phosphate on productivity and phosphorus balance in a rice¨Crapeseed¨Cmungbean cropping system

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• 作者：S. N. Sharma ; R. Prasad ; Y. S. Shivay ; M. K. Dwivedi ; Sandeep Kumar ; M. R. Davari ; Moola Ram and Dinesh Kumar
• 关键词：Available P ; CO2 evolution ; Diammonium phosphate ; Mussoorie rock phosphate ; Phosphorus balance ; Phosphorus solubilizing bacteria ; Productivity ; Relative agronomic effectiveness
• 刊名：Nutrient Cycling in Agroecosystems
• 出版年：2010
• 出版时间：March, 2010
• 年：2010
• 卷：86
• 期：2
• 页码：199-209
• 全文大小：327.3 KB

文摘

The field experiments were conducted at the Indian Agricultural Research Institute, New Delhi, India for 3 years from 2001–2002 to 2003–2004 to study the relative efficiency of diammonium phosphate (DAP) and Mussoorie rock phosphate along with phosphorus solubilizing bacteria inoculation (MRP + PSB) at different rates of application on productivity and phosphorus balance in a rice-rapeseed-mungbean cropping system. Phosphorus application significantly increased the productivity of rice-rapeseed-mungbean cropping system and resulted in an increase in 0.5 M NaHCO₃ extractable P content in soil. The relative agronomic effectiveness (RAE) of MRP + PSB in relation to DAP as judged by the total productivity was 53–65 % in the first cycle but reached 69–106 % in the third cycle of the cropping system. The P balance (application—crop removal) was generally more positive for MRP + PSB than DAP and the highest P balance was recorded with an application of 52.5 kg P ha−1 as MRP + PSB, resulted in highest 0.5 M NaHCO₃ extractable P content in soil. The present study, thus, shows that MRP + PSB could be usefully employed as an alternative to DAP in long term in the rice–rapeseed–mungbean cropping system.