Document Type : Research Article
Authors
1
Department of Agriculture, Islamic Azad University, Lahijan Branch, Lahijan, Ira
2
Department of Agriculture, Islamic Azad University, Lahijan Branch, Lahijan, Iran
3
Department of Agronomy and Plant Breeding, Lahijan Branch, Islamic Azad University, Lahijan, Iran
10.22067/jcesc.2024.89365.1346
Abstract
Introduction: Compared to other essential elements, rice needs more nitrogen. Therefore, for higher plant growth and productivity, nitrogen is used excessively. Combining chemical fertilizers with biological and organic fertilizers is one of the ways to reduce the excessive consumption of chemical fertilizers.
Materials and Methods: In order to determine the appropriate level of nitrogen fertilizer and seaweed extract on the yield and yield components of Hashemi cultivar, an experiment was conducted, in Kishakjan village, Rudsar city, in Guilan province in 2022 and 2023. The experiment used the split plots in the form of randomized complete block design with three replications, the main factor being nitrogen fertilizer from the urea source at five levels (zero (control: without fertilizer use), 25, 50, 75 and 100 percent of nitrogen needed by the plant) and the sub factor of foliar spraying of fertilizer containing seaweed extract at four levels (zero (control: without seaweed use), 0.5, 1 and 1.5 liters per hectare) were considered.
Results and Discussion: The results showed that the application of nitrogen fertilizer levels and seaweed foliar application was significant on the investigated characteristics. So that the highest number of chlorophyll content (35), spike length (29.3 cm), thousand grain weight (26.3 gr), grain yield (4014 kg.ha-1), biological yield (7690.8 kg.ha-1) and the harvest index (59.5%) was obtained in the application of 75% nitrogen fertilizer. In addition, the highest amount of the characteristics expressed in foliar spraying of seaweed fertilizer with a concentration of 1 lit.ha-1 was obtained, which was not significantly different from the concentration of 1.5 1 lit.h-1. The results of the interaction of experimental treatments also indicate the highest plant height (150 cm), the number of spike (29), the number of full seeds (132.4), respectively, in the application of 100% nitrogen fertilizer* 1 lit.ha-1 of seaweed and 75% nitrogen fertilizer* 1 lit.ha-1 of seaweed. The lowest number of unfilled seeds (4.2) and percentage of unfilled seeds (3.5) were recorded for the application of 75% nitrogen fertilizer*no use of seaweed fertilizer and 75% nitrogen fertilizer*1 lit.ha-1of seaweed fertilizer, respectively.
Conclusion: In general, foliar application of one liter per hectare of seaweed and use of 50 and 75% nitrogen fertilizer was the best treatment to increase yield and yield components of Hashemi variety in the study region.
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