See more from this Session: Management Strategies to Improve Nutrient Use Efficiency: I
Field experiments were conducted in 2009 and 2010 on a medium textured clay loam. A 4 x 5 factorial experimental design was used with four establishment systems (MT; MT+S; P; P+S) and 5 N rates (0, 140, 180, 220, 260 kg/ha) with 4 replications. Crop N uptake (CNU) was recorded during the growing season. Harvest measurements included grain and straw N uptake, grain yield and grain protein. Statistical analysis was carried out by analysis of variance using Genstat.
In 2009 the MT treatment had an increasing CNU as the season progressed with a significantly higher uptake than the P treatment at GS 65 and 75. However, cultivation system had no significant effect on grain yield or total N uptake at harvest. Due to poor crop establishment with MT in 2010, the P treatments had a higher CNU at GS 24, 28, 32 and 47. Although there was no difference in CNU at GS 65 or 70 the P treatments had a significantly higher grain yield and total N uptake than the MT at harvest. Straw incorporation had little effect in both seasons.
These field experiments indicate that the impact of MT on yield and N uptake parametres is season and weather dependent.