Effect of Non-chemical Methods in Integration with Reduced Rates of Trifluralin on Weeds and Yield of Dill (Anethum graveolens L.)

This research was conducted in order to evaluate the effect of different rates of trifluralin in integration with non-chemical managements including living mulch, straw mulch and hand weeding on weeds, growth characteristics and yield of dill.

The experiment was conducted in Research Field of Agriculture-Jahad in Khoda Afarin County in 2019 as factorial based on randomized complete block design with three replications. The first factor was application of different rates of trifluralin at four levels including 0, 50, 75 and 100 % of recommended dose (2 L/ha) of herbicide and the second factor was different levels of non-chemical weed management and control (without non-chemical weed management). Also the weed-free treatment was considered in the experiment.

The results indicated that the weed biomass was affected by non-chemical weed management treatments. The effect of hand weeding treatment in reduction of weed biomass was higher than that in wheat straw mulch treatment. The greatest grain yield of dill (9840 kg/ha) was obtained in application of recommended dose of trifluralin + wheat straw mulch.

In living mulch treatments there were no significant difference in dill grain yield in 50 and 75% of herbicide recommended dose. Generally application of straw mulch and hand weeding had higher grain yield compared with fenugreek and bitter vetch living mulch treatments and could be recommended to the growers.