Document Type : Research Paper
Authors
1
Department of Agronomy, Sari Agricultural Sciences and Natural Resources University
2
Department of Agronomy, Sari University of Agricultural Sciences and Natural Resources,
3
Associate Professor, Department of Agronomy, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran
4
Agronomy and Plant Breeding, Faculty of Agricultural Sciences and Natural Resources, University of Gonbad of Iran
10.22034/saps.2025.63799.3287
Abstract
Objectives: Yellow nutsedge (YN) is one of the perennial weeds that reduce the rice yield in paddy fields. This experiment was conducted to evaluate the effect of density and relative time of emergence of this weed on the growth and yield of the Hashemi variety of rice.
Materials and methods: An experiment was conducted in 2023 in a factorial arrangement based on a randomized complete block design in three replications. The density of YN at four levels (zero, 15, 30, and 45 plants per square meter) and the relative time of weed emergence at three levels (at the same time, one and two weeks after planting) were the two experimental factors.
Results: PY at the same time as transplanting, one and two weeks after transplanting YN weed and at densities of 15, 30 and 45 plants per square meter were reduced by 29.90, 32.89, 49.83, 32.23, 35.22, 47.18, 9.97, 15.61 and 17.61%, respectively. In the same conditions, simultaneous planting with on weed competition had a higher biological yield than simultaneous planting with a density of 45 plants (485 grams vs. 288 grams per square meter).
Conclusion: With the increase in the relative time of the emergence of the YN, the intensity of its density decreased, so that two weeks after planting, the effect of the YN density on most of the yield components was insignificant. In general, the results showed the extreme sensitivity of PY to the simultaneous interference of YN even at low densities.
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