| Abstrakt: |
Objective: Considering that the compost of sugarcane residues softens the soil texture and the use of plant growth stimulating bacteria increases the plant's tolerance against abiotic stress, including heat stress. To assess the combined effect of nitrogen fertilizer with sugarcane residue and growth-promoting bacteria on the qualitative traits and yield of wheat grain under terminal heat stress conditions, an experiment was carried out as split-split plots in the form of a randomized complete block design with three replications in the cropping season of 2021-2022 at the research farm of Khuzestan University of Agricultural Sciences and Natural Resources. Methods: The experimental factors included three sowing dates: 22 November, 11 December, and 31 December in the main plots; six combination of nitrogen with compost including control, 100% nitrogen, 75% nitrogen+ 25% compost, 50% nitrogen+ 50% compost, 25% nitrogen+ 75% compost, and 100% compost in sub-plots, as well as two levels of application and without application of bacteria in the sub sub-plots. Results: Mean comparisons showed that the combined use of 50% nitrogen + 50% compost with bacterial application increased the characteristics of grain filling duration and grain filling rate, grain protein percentage, and wet gluten. Also, the highest seed yield (5864 kg/ha) was obtained on the first planting date and combined consumption of 50% nitrogen + 50% compost and the lowest amount (1115 kg/ha) was obtained on the third planting date and the control treatment. Conclusion: In general, the combined use of nitrogen fertilizer and compost with growth-promoting bacteria could reduce the negative effect of terminal heat stress on the measured plant traits. [ABSTRACT FROM AUTHOR] |
