Interaction of irrigation regimes and drip-line installation depth on Rapeseed water productivity

The aim of this study was to investigate the interaction of irrigation regimes and drip-line installation depth on Rapeseed water productivity. The results showed that the effect of different irrigation regimes (I) on all studied traits in Rapeseed (grain yield, 1000-seed weight, number of pods, pod length, number of branches) and water productivity had a significant effect (P <0.01). Increasing the drip-line depth had a negative effect on the Rapeseed yield, yield components and water productivity. So that, the highest amount of each of the mentioned traits was observed at a depth of D1 (30 cm). Differences of 21 and 59% in the first year and 22 and 58.8% in the second year between I2 and I3 treatments with I1 treatment indicate this superiority. The highest water productivity in each of the drip-line depth was allocated to the I2 treatment. It seems that despite the lower consumption of water in the I2 treatment, the performance obtained from this treatment has increased the water productivity compared to the I1 treatment. The interaction effects of different irrigation regimes and drip-line depth showed no significant effect on yield, yield components and water productivity. Considering that the drip-line depth of 30 and 40 cm did not have much effect on the studied traits, however, it is a better choice considering that by placing irrigation pipes at a depth of 40 cm, plowing operations can be extended to depths.