Mohammad Hasaninasab; Esfandiar Fateh; Amir Aynehband; Ali Monsefi; Korosh Behnamfar
Abstract
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Objective: This study aimed to investigate the effects of combined application of NPK chemical fertilizers and organic fertilizers on the yield traits and quantitative characteristics of the hibiscus plant during the 2022-2023 agricultural year at the research farm of the Agricultural and Natural ...
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Objective: This study aimed to investigate the effects of combined application of NPK chemical fertilizers and organic fertilizers on the yield traits and quantitative characteristics of the hibiscus plant during the 2022-2023 agricultural year at the research farm of the Agricultural and Natural Resources Research Center in Khuzestan Province, Ahvaz.
Method: The experiment was conducted using a split-split plot design within a randomized complete block design with three replications. The treatments included four levels of chemical fertilizers (N0–P0–K0, N75–P50–K50, N150–P75–K75, and N225–P100–K100) and four levels of organic fertilizers (no organic fertilizer, humic acid, vermicompost, and a combination of humic acid + vermicompost).
Results: Analysis of variance indicated significant main effects of chemical fertilizer, organic fertilizer, and their interaction on all measured traits in roselle. Post hoc comparisons using LSD test (α=0.05) revealed that the combination of N100–P100–K225 with humic acid + vermicompost produced the highest values for most traits, except for seed oil percentage, which was comparable to the N150–P75–K75+ humic acid+ vermicompost treatment for seed dry weight. No significant differences were observed among treatment combinations for aerial parts, number of seeds per boll, 1000-seed weight, sepals per boll, antioxidant capacity of sepals, and biological yield. The lowest trait values were associated with the control treatment (N0–P0–K0) without organic fertilizer. The combined use of organic and chemical fertilizers was found to be compatible and synergistic, providing optimal conditions for plant growth.
Conclusions: The findings underscore the significant influence of NPK fertilizer levels on measured traits, with organic fertilizer effects being comparatively less pronounced. Both chemical and organic fertilizers—individually and in combination—improved the growth, yield, and quality of roselle. The integrated use of chemical and organic fertilizers not only reduces production costs but also enhances crop quality while promoting soil health, biodiversity, and sustainability. Organic fertilizers improve soil physical and chemical properties, stimulate root development, and promote the activity of growth-promoting bacteria, thereby increasing nutrient availability. Continuous mineral supply further supports plant development, fruiting, and product quality.
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Mohsen Feyzolahi; Ali Monsefi; Afrasyab Rahnama; masomeh farzaneh
Abstract
In order to investigate the effects of chemical and integrated weed management on yield and yield components of grain maize and weed population, the study has been conducted as a randomized complete block design with three replications in 2018-19 in Shavar Research Center in Shavar region of Shousha ...
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In order to investigate the effects of chemical and integrated weed management on yield and yield components of grain maize and weed population, the study has been conducted as a randomized complete block design with three replications in 2018-19 in Shavar Research Center in Shavar region of Shousha city. Treatments include unweeded (control), hand weeding, 1.5 liters of atrazine, 1 liter of atrazine + straw mulch, 175 g of ultima, 150 g of ultima + straw mulch, 1.5 liter 2,4-D + MCPA, 1 liter 2,4-D + MCPA + straw mulch, 1.5 liters cruise, and 1 liter of cruise + straw mulch. Results show that the highest grain yield has been obtained in hand weeding treatment as well as 1 liter of cruise + straw mulch by 14.4 and 13.2 t ha-1, respectively. The highest biological yield is recorded in hand weeding treatment (31.5 t ha-1). In case of harvest index, 1.5 liters of cruise show the highest value (55.7%), followed by 1.5 liters of 2,4-D + MCPA and 1.5 liters of atrazine by 53.6% and 47.7%, respectively. In terms of weed population dynamics, hand weeding, and 1 liter of cruise + straw mulch cause the greatest decrease in weed population and dry weight which reduce crop competition and increase productivity. In general, based on the results, the adoption of integrated approaches (chemical + cultural + mechanical) can make a significant contribution to increasing corn yield and reducing environmental pollution.