Weed Management Practices on Nutrient Uptake, Yield Attributes and Yield of Rice Under System of Rice Intensification

Abstract

An experiment was conducted at wetland farm of Tamil Nadu Agricultural University, Coimbatore during August to January 2009 to test the effect of different weed management practices on the nutrient uptake by weeds and SRI rice. The major weeds found in the experimental field were Echinochloa crus-galli (L.), Cyperus difformis (L.), Eclipta alba (L.) and Ammania baccifera (L.). The application of pretilachlor as pre-emergence at 0.75 kg a.i. ha-1 + 4 times conoweeding from 10 DAT at 10 days interval (T5) has recorded significantly lower uptake of N, P, K by weeds and it was on par with the application of butachlor as pre- emergence at 1 kg a.i. ha-1 + 4 times conoweeding from 10 DAT at 10 days interval (T4) and application of almix as post-emergence at 20 g a.i. ha-1 + 4 times conoweeding from 10 DAT at 10 days interval (T3). The highest uptake of N, P, K and maximum yield by SRI rice was recorded by application of pretilachlor as pre-emergence at 0.75 kg a.i. ha-1 + 4 times conoweeding from 10 DAT at 10 days interval (T5).