Canola Yield and Yield Components as Affected by Different Tillage Practices in Paddy Fields

摘要

The effects of different seedbed preparation practices in canola planting as a second crop after rice harvest was scrutinized. Experimental treatments included (i) rotivator, once to 10-15 cm deep (T1), (ii) rotivator, twice to 10-15 cm deep (T2), (iii) mouldboard plow to 25 cm deep + rotivator, once to 10-15 cm deep (T3), (iv) no-till planting through removing rice stubbles from plots (T4), and (v) no-till planting without removing rice stubbles from plots (T5). The experiments were laid out in randomized complete block design (RCBD) with five treatments and in three replications. The results revealed that grain yield and yield components (except number of grain per pod and number of branch per plant) were significantly influenced by different tillage practices. The biennial means comparison showed that the maximum and minimum grain yield were associated to T3 (1571 kg ha-1), T2 (1537 kg ha-1) and T4 (1389 kg ha-1) and T5 (1339 kg ha-1), respectively. The average grain yield for T1 was 1432 kg ha-1. In primary tillage through moldboard plow, soil sticking to plow and tractor rear wheel slippage made a great deal of rugged surface across the field so that it took much time for land leveling. Therefore, rotivator application (once or twice) had acceptable outcomes in such soil moisture contents.