Draft

The combined effects of tillage options, nitrogen management and levels on wheat yield (Triticum aestivum L.) as a winter crop on raised beds has increased productivity in the temperate world but has not been investigated in lesser developed countries, like Bangladesh. Therefore, a study was conducted during 3 wheat seasons at the Regional Wheat Research Center experimental field in Rajshahi NW Bangladesh, to compare the effects of tillage options, nitrogen levels and management strategies on wheat. In a strip-split plot design, two tillage systems were tested: manually prepared, permanent bed (PB) and conventionally tilled on the flat (CTF). Within each tillage system, two nitrogen management practices were used: broadcast, (BC) and furrow placement (FP) between wheat rows. Three N levels (50, 100 and 150% of recommended N) representing 60, 120 and 180 kg N/ha were used. PB increased wheat yield by 18% when compared with CTF. Predictably, wheat yields responded to N fertilizer rates in all years over all treatments. There were no statistical differences between the two nitrogen managements in 2 out of 3 years, i.e. BC and FP. Using raised beds at 150% N rate, yield was statistically higher in all years. Using raised beds at 50% N rate, yield was statistically equal to 150% conventionally tilled in all years. The data indicate that by using raised beds compared to conventional tillage, nitrogen uptake and efficiency can be increased. The maximum N uptake by the grain and straw was recorded in PB where the highest dose of N was applied. Permanent bed tillage systems also showed substantial water saving (32%) over the CTF treatments. Thus, in warmer areas where water resources are often limited and nutrient uptake and efficiencies are low, the use of raised beds in a permanent bed cropping system would be a distinct advantage.

Text in English

0503|AL-Wheat Program