Relative performance of rice (Oryza sativa)-ratoon production system as influenced by date of sowing and system of cultivation of plant rice genotypes Dwibedi Sanat Kumar1,*, De Gopal Chandra2, Dhua Sudhi Ranjan3 Visva Bharati University, Santiniketan, Bolpur, West Bengal-731 235 1Assistant Professor (Agronomy), Orissa University of Agriculture and Technology, Bhubaneswar, Odisha-751 003 2Professor (Agronomy), ASEPAN, Sriniketan, Visva Bharati University, Santiniketan, Bolpur, West Bengal-731 235 3Principal Scientist, Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, Odisha-753 006 *Corresponding author's Email: sanatdwibedi@rediffmail.com
Online published on 11 October, 2017. Abstract Field experiments were conducted in coastal Odisha, India during 2009 to 2011 in split split-plot design to investigate whether modified system of rice (Oryza sativa L.) intensification (MSRI) mimicking all the production principles of system of rice intensification (SRI), except planting geometry and seedling number that were in accordance to the best management practice (BMP), could improve the performance of plant rice genotypes compared to the latter two different water using systems under varying dates of sowing during the wet season. Attempts were also made to ascertain their relative impacts on the succeeding ratoon crop. Grain yield in plant rice sown by 20 June (early) was significantly the highest followed by 5 and 20 July sowing with 5.73% and 17.14% reduction in yield. MSRI was superior over SRI and BMP with 11.32% and 35.46% increase in yield and Hybrid ‘Ajay’ yielded higher (9.07%) than HYV ‘Tapaswini’. The performance of ratoons followed the similar trend as in plant rice. Early sown hybrid ‘Ajay’ in MSRI produced significantly the highest and 20 July sown ‘Tapaswini’ in BMP had the lowest grain yield in plant rice. Superiority of early sown rice, MSRI and hybrid ‘Ajay’ could be attributed to the synergistic effects of their yield attributes. The root volume of plant rice at 100 DAS had strong correlation with the plant height, straw and grain yield of plant rice as well as the grain yield of subsequent ratoon. Top Keywords Correlation, Date of sowing, Genotype, Hybrid, Ratoon, Rice, System of rice intensification. Top |