Residual Effect of Different Establishment Methods and Organic Manures Imposed on Rice on Growth, Yield, Nutrient Uptake and Economics of Succeeding Green Gram

Cereal-cereal cropping sequence is one of the major crop sequences followed on the same land over the years that has led to decreased soil fertility and increased concern for sustainability. It significantly causes the depletion of available soil nutrients leading to decreased crop productivity. Therefore, it is vital to make efforts to include leguminous crops after rice for maintaining soil fertility and sustainability. Mungbean (Vigna radiata L.) is an option that can be included in different rice-based cropping systems for enhancing soil productivity.

The experiment was conducted over two consecutive seasons, 2021-22 and 2022-23 on clay loam soils at S.V. Agricultural College, Tirupati campus of Acharya N G Ranga Agricultural University, Andhra Pradesh. The test varieties used in the present field experiment were NLR-34449 for rice and LGG-460 for green gram. The rice experiment included three establishment methods as main plot treatments and seven organic nutrient management as sub-plot treatments. Following the rice cultivation, green gram was sown to assess the residual effects of the treatments.

The results revealed that the growth and yield parameters as well as economics of green gram were significantly higher in dry direct seeded rice compared to transplanted and wet seeded rice. Among different organic manures, application of 100% recommended dose of nitrogen (RDN) through poultry manure (PM) to rice resulted in significantly higher growth and yield parameters of green gram followed by application of 50% RDN through FYM + 50% RDN through PM. The interaction effect between different establishment methods and organic manures could not exert any significant influence on any of the parameters studied in the present investigation.