Plant Productions

Assistant Professor Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

Majid Gholamhoseini; Amirkhosro Danaie; Abbas Fallah toosi

Volume 45, Issue 4 , February 2023, , Pages 575-587

https://doi.org/10.22055/ppd.2022.40492.2023

Abstract

Introduction Sesame (Sesamum indicum. L) belongs to the Pedaliaceae family and is an annual and thermophilic plant known as the queen of oilseeds. Sesame is compatible with the climatic ... Read More Introduction Sesame (Sesamum indicum. L) belongs to the Pedaliaceae family and is an annual and thermophilic plant known as the queen of oilseeds. Sesame is compatible with the climatic conditions of Iran, and due to its unique characteristics, it is possible to cultivate it second after wheat in arid and semi-arid regions. To utilize the maximum production capacity of sesame, implementing the proper agronomic practices such as plant density, optimal planting arrangement and selecting the appropriate genotype is inevitable. Materials and Methods To investigate the effect of planting arrangement and planting density on grain yield of two sesame genotypes, a factorial experiment based on a randomized complete block design with three replications was carried out in a hot and dry region situated in Behbahan (30° 36’ N; 50° 14’ E) in 2017 and 2018. The region is characterized as arid, and the average yearly precipitation (over a 30-yr period), which occurs mostly during the autumn and winter months, is 345 mm for the site. The annual mean temperature is 24 °C. The average temperature in 2017 was similar to the long-term meteorological data trend, while in 2017, the average temperature (22 °C) was lower. In this experiment, three factors included planting arrangement (cultivation of one and two rows on the ridge), planting density per unit area (including 20, 30 and 40 plants per square meter) and sesame genotypes Behbahan (local name) and Shavin cultivar were investigated. Data were subjected to ANOVA using SAS software (9.4 version). Because Bartlett’s test revealed homogeneity in the variance of all studied traits, data were presented as the mean values for both years. When an F-test showed statistical significance at, the protected LSD was used to separate the main effects, and the significant interaction effects were separated by the slicing method. Results and Discussion The results of grain yield, as the most important trait, indicated that in single-row cultivation, the maximum yield of the Behbahan genotype (1068 kg ha-1) was obtained at a density of 20 plants per square meter. An increase in planting density caused a significant reduction in grain yield when Behbahan genotype was sown as single-row arrangement. In two-row cultivation, the Behbahan genotype responded positively to an increase in plant density and an increase in planting density was associated with a significant increase in grain yield. However, the maximum grain yield obtained in two-row cultivation with a density of 40 plants per square meter (919 kg ha-1) was 16% lower compared to the superior treatment (single-row cultivation with a density of 20 plants per square meter). In the Shavin cultivar, the maximum grain yield was obtained in single-row (683 kg ha-1) and two-row (610 kg ha-1) arrangements at densities of 40 and 20 plants per square meter. The results showed that the average grain yield of the Behbahan genotype (851 kg ha-1) was significantly higher than the Shavin cultivar (561 kg ha-1). Conclusion Overall, in the Behbahan region and for the local genotype of Behbahan, as the superior genotype, a single-row arrangement and plant density of 20 plants per square meter is recommended.

Effect of Methanol Spraying on some Morphophysiological Characteristics, Yield and Yield Components of Sunflower (Helianthus annuus L.) under Drought Stress Conditions

Hamed Javadi; Seyyed Gholam Reza Moosavi; Mohammad Javad Seghatoleslami; Ali Reza Ebrahimi; Mohammad Kozegar

Volume 45, Issue 1 , May 2022, , Pages 29-40

https://doi.org/10.22055/ppd.2020.33127.1888

Abstract

IntroductionSunflower (Helianthus annuus L.) is one of the five important oil plants of Iran. Water deficit stress is one of the most important limiting factors in sunflower cultivation. ... Read More IntroductionSunflower (Helianthus annuus L.) is one of the five important oil plants of Iran. Water deficit stress is one of the most important limiting factors in sunflower cultivation. Methanol is used to deal with environmental stresses, especially dehydration. Preventing or reducing light respiration, delaying leaf senescence, increasing photosynthetic activation period and leaf area duration index and increasing CO2 fixation are among the roles of methanol application in plants. Therefore, this study was conducted to investigate the effect of methanol spraying on some morphophysiological characteristics, yield and yield components of sunflower under drought stress conditions. Materials and MethodsThis field experiment was conducted as a split plot based on randomized complete block design with three replications in Birjand, Iran, in 2017. The main plots included two irrigation levels (irrigation after 80 and 160 mm evaporation form class A pan). On the other hand, the sub- plots included five levels of methanol spraying; control (spraying with water), 7, 14 and 21% v/v. Statistical analysis was performed using MSTATC software. Duncan's multiple range test at the 5% level of probability was used to compare the means. Results and DiscussionResults showed that deficit irrigation reduced stem diameter, number of grains per head and kernel/husk weight ratio. Methanol spraying also increased the number of grains per head. Also, methanol spraying improved most of the studied traits under two irrigation treatments. So that under drought stress conditions, foliar application with 28% volumetric methanol increased plant height (9.9%), stem diameter (5%) and leaf number per plant (14.7%). Compared with control, foliar application with 14% and 21% volumetric methanol increased SPAD by 8% and 34.7%, respectively and also, increased 1000-grain weight (12%), grain yield (27.9%) and biological yield (23.4%). According to the results, under optimum irrigation conditions, maximum sunflower grain yield was obtained with 28% volumetric methanol spraying, but under drought stress conditions, spraying with 21% volume methanol was the best one. ConclusionThe results showed that foliar application of methanol under optimum and also deficit irrigation conditions did not affect the percentage and yield of sunflower oil seed, but increased grain yield. Maximum grain yield under optimum irrigation was obtained with 28% volumetric spraying, which was 27% more than control. Also, the results showed that under arid and semi-arid conditions of Birjand, deficit irrigation with using methanol (21% volumetric) produces acceptable grain yield.

The effect of nitrogen fertilizer rates and withheld irrigation stress on yield and yield components in different growth stages of oilseed rape

M A; M.J B

Volume 33, Issue 2 , March 2011, , Pages 15-30

Abstract

Oilseed rape (Brassica napus L.) is one of the most important oilseed crop which in recent years was attentioned, therefore; cultivation, production and its management in order to increase ... Read More

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Keywords = Oil percentage

Assistant Professor Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

Abstract

Effect of Methanol Spraying on some Morphophysiological Characteristics, Yield and Yield Components of Sunflower (Helianthus annuus L.) under Drought Stress Conditions

Abstract

The effect of nitrogen fertilizer rates and withheld irrigation stress on yield and yield components in different growth stages of oilseed rape

Abstract