Influence of planting methods and different vermicomposts on the yield and nitrogen use efficiency in rice

Balamurugan, R and Sudhakar, P

Field experiments were conducted at Annamalai University, Experimental Farm, Annamalainagar, Chidambaram during two seasons namely Navarai of 2009-2010 and late samba of 2010- 2011 to identify the influence of different cultivation systems and various vermicomposts on productivity and nitrogen use efficiency of rice. The experiment was laid out in a split plot design. The crop planting methods was assigned to main plot and different vermicomposts to sub plot. Three planting methods viz., M1 (puddle direct sowing), M2 (conventional transplanting), and M3 (System of Rice Intensification) in main plot and different vermicompost viz., S1 (Sewage sludge based vermicompost), S2 (FYM based vermicompost), S3 (Sugarcane trash based vermicompost), S4 (Pressmud based vermicompost) and S5 (No vermicompost-control) under sub plot were evaluated. The treatments were replicated thrice. Among vermicomposts, pressmud based vermicompost recorded better growth. The results revealed that crop raised with SRI registered higher grain, straw yield and harvest index among various methods of planting. With regard to different organic sources of vermicompost, pressmud based vermicompost application resulted in higher grain, straw yields and harvest index. The crop planting methods had significant influence on the Nitrogen use efficiency (NUE) and Economic nitrogen use efficiency (ENUE) by the crop at harvest. SRI recorded the highest Nitrogen use efficiency (NUE) and Economic nitrogen use efficiency (ENUE) followed by conventional method of planting. Among the different organic source of vermicompost, pressmud based vermicompost registered the highest Nitrogen use efficiency (NUE) and Economic nitrogen use efficiency (ENUE) values at harvest. Based on the above experimental results, it could be concluded that cultivation of rice with SRI method along with application of pressmud based vermicompost @ 3.0 t ha-1 will be a promising combination which not only resulted in higher yields but also superior in respect of nitrogen and economy .