Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 55 3 2024 09 22 Effects of Trichoderma Fungi on Growth and Productivity of Rapeseed in Late-Season Cultivation of East-Azarbaijan Cold Climate Effects of Trichoderma Fungi on Growth and Productivity of Rapeseed in Late-Season Cultivation of East-Azarbaijan Cold Climate 89 98 99291 10.22059/ijfcs.2024.373101.655065 FA Bahman Pasban Eslam 1- Associate Professor of Crop and Horticultural Science Research Department, East Azarbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran 0000-0001-6116-5392 Laleh Naraghi 2- Associate Professor of Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran 0000-0001-5767-2498 Journal Article 2024 02 26 The current research aimed to study the effect of delaying the fall planting date of rapeseed in cold climates using Trichoderma fungi. An experiment was conducted as a split plot based on an RCBD design with three replications using the Ahmadi cultivar in the East Azarbaijan Agriculture and Natural Resources Research and Education Center for two years (2021-23). The main factor was planting date including apropos (11 and 21 September) and late cultivation (1 and 11 October), and the sub-factor was Trichoderma fungi (Trichoderma harzianum) treatment including control, seed, and soil treatments. Delaying the planting date from 11 September to 11 October by increasing 20.7 percent in cold damage led to a decrease in seed and oil yields by 1425 and 676 Kg ha-1, respectively. The soil and seed treatment with fungi significantly increased plant growth rate and chlorophyll and decreased cold damage during winter from 35.2 in control (unused fungi) to 28.7 and 21.3 percent in soil and seed treatment, respectively. In addition, seed and oil yields increased. These effects were higher in seed treatment and seed yield increased by 27 and 27.6 percent on the 11 September and 11 December planting dates, respectively, in soil treatment by fungi. According to the results, using Trichoderma fungi as a seed treatment on 11 October late cultivation date, increased seed yield from 2703.3 to 4128.6 Kg ha-1. The mentioned fungi by increasing fall growth and decreasing cold damage in rapeseed, caused a prevent of significant decrease in seed yield at late cultivations. The current research aimed to study the effect of delaying the fall planting date of rapeseed in cold climates using Trichoderma fungi. An experiment was conducted as a split plot based on an RCBD design with three replications using the Ahmadi cultivar in the East Azarbaijan Agriculture and Natural Resources Research and Education Center for two years (2021-23). The main factor was planting date including apropos (11 and 21 September) and late cultivation (1 and 11 October), and the sub-factor was Trichoderma fungi (Trichoderma harzianum) treatment including control, seed, and soil treatments. Delaying the planting date from 11 September to 11 October by increasing 20.7 percent in cold damage led to a decrease in seed and oil yields by 1425 and 676 Kg ha-1, respectively. The soil and seed treatment with fungi significantly increased plant growth rate and chlorophyll and decreased cold damage during winter from 35.2 in control (unused fungi) to 28.7 and 21.3 percent in soil and seed treatment, respectively. In addition, seed and oil yields increased. These effects were higher in seed treatment and seed yield increased by 27 and 27.6 percent on the 11 September and 11 December planting dates, respectively, in soil treatment by fungi. According to the results, using Trichoderma fungi as a seed treatment on 11 October late cultivation date, increased seed yield from 2703.3 to 4128.6 Kg ha-1. The mentioned fungi by increasing fall growth and decreasing cold damage in rapeseed, caused a prevent of significant decrease in seed yield at late cultivations.

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