Optimizing nitrogen rate and planting density for sunflower under irrigated conditions of Punjab

Rasool, Khalid; Wajid, Aftab; Sanaullah,; Ghaffar, Abdul; Shoaib, Muhammad; Arshad, Muhammad; Abbas, Samra

doi:10.3329/sja.v13i1.24190

Cited by 6 publications

(6 citation statements)

References 6 publications

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“…In the monoculture, head diameter in P45 was higher than in P90 (p<0.01): means of 13.23 and 11.09 cm, respectively. This difference in size was small, whereas in other studies involving populations of sunflowers, there were reductions between 4 and 14 cm in head diameter when the population was as twice as dense (Sedghi et al, 2008;Rasool et al, 2015).…”

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confidence: 67%

“…The data on yield components of sunflower offer further insights into these results ( Table 2). One of the components that most affect yield is head diameter, as it influences both achene size and number of achenes per head (Rasool et al, 2015). This characteristic was crucial for the occurrence of higher yields in the denser population.…”

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confidence: 99%

“…Number of achenes per head and 1000 achene weight were higher in the population of P45 (p<0.01 for both characteristics). This inverse relationship between these characteristics and the increase in plant population are due to increased competition between plants (Castro et al, 2011;Rasool et al, 2015).…”

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High Sunflower Densities as a Weed Control Strategy in an Integrated Crop-Livestock System

et al. 2019

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Sunflower is an important crop for Integrated Crop-livestock Systems (ILCS), and one of the main management difficulties identified in this crop is weed control, especially under no-till conditions when chemical weed control is not allowed. Therefore, the aim of this research was to evaluate the effect of greater sunflower population density on weed control, and its impact on sunflower yield, in an ILCS with eucalyptus in an Environmental Protection Area. Two population densities were tested (45 and 90 thousand pl. ha-1) in two crop systems (sunflower monoculture and sunflower-eucalyptus integration). An additional treatment was provided in the sunflower-eucalyptus integration, and 5 positions (2,4; 4,8; 7,2; 9,6; and 12 m) between the tree rows were evaluated. In a randomized block design, with eight repetitions, weed density and weed dry matter were determined at 40, 70 and 100 days after crop emergence. Also, phytosociological indices were calculated. The following yield components were evaluated: head diameter, number of achenes per head, and 1000-achene weight. There was lower weed infestation on the high density treatment in both systems. There was no difference of weed occurrence in the 5 positions between the tree rows. Sunflower yield was higher in the greatest population density in both systems. Increasing population density in sunflower crop is a practicable management to control weeds and to gain higher yield under free-herbicide conditions.

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High Sunflower Densities as a Weed Control Strategy in an Integrated Crop-Livestock System

et al. 2019

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“…Zubillaga et al [11] have showed that the sunflower biomass increased from 19 to 40% when an optimum nitrogen amount was applied. In addition, nitrogen fertilizer had positive effects on sunflower dry yield according to other researches [12,13]. On the other hand, nitrogen is considered to be one of the costliest inputs in agricultural management [14].…”

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confidence: 99%

Effect of Different Tillage Practices in Sunflower (<em>Helianthus annuus</em>) Cultivation in a Crop Rotation System with Intercropping Triticosecale -Pisum sativum

Molla¹,

Charvalas²,

Dereka³

et al. 2022

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The objective of this work was to investigate the effect of different soil tillage practices in sunflower cultivation in a rotation system with intercropping Triticosecale x Pisum sativum. For this purpose a two year experimental field of 5% slope was established in central Greece. There were four treatments with three replications each. The treatments were: (a) no tillage - planting parallel to the contour (NTC-PAC), (b) conventional tillage - planting parallel to the contour (CTC-PAC), (c) no tillage - planting perpendicular to the contour (NTC-PEC), (d) conventional tillage - planting perpendicular to the contour (CTC-PEC). During the experiment plant height, leaf area index, specific leaf area, plants’ total nitrogen and plants’ proteins were measured. According to the results plant height ranged from 64.9 (CTC-PAC) to 85.2 cm (NTC-PEC) the 1st year and between 66.5 – 86.5 cm in CTC-PAC and NTC-PEC treatments in the 2nd year. Furthermore, LAI and SLA, plant’s total nitrogen and protein content and N-uptake were affected positively by the no tillage practice. To conclude, sunflower is a promising crop in a rotation system with intercropping Triticosecale x Pisum sativum, cultivating under rainfed sloping conditions.

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“…The highest seed weight head -1 with the geometry of 85 x 20 cm may be associated to optimum row and plant spacing. Planting densities caused positively significant impact on sunflower seed weight head -1 (Rasool et al, 2015).…”

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Nutri-Seed Priming and Planting Geometry Effects on Growth and Oil Production of Sunflower Varieties under the Ecological Conditions of Tandojam, Sindh, Pakistan

Abbasi¹,

Kandhro²,

Soomro³

et al. 2020

SJA

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E dible oil has been reported as one of the most important commodities of daily use in Pakistan (Khan and Akmal, 2016;Amjad, 2014). The country is facing acute deficit of edible oil and hence imported annually about 88% edible oil for its consumption (GoP, 2018). Pakistan is the 3 rd largest importer of edible oil in the world (Soomro, 2015). Sunflower is a major oilseed crop after soybean, palm and rapeseed in the world (Shah et al., 2013). It ranks 2 nd in Pakistan after cotton (Siddiqui, 2010). The crop is adapted well to the environmental conditions and prevailing cropping systems (Mahmood at al., 2018). In a Abstract | Seed priming improves germination, crop stand and finally the yield. Two years field study was undertaken to assess the effect of primed seeds with different solutions and planting geometries on growth and yield of sunflower in agro-ecological conditions of Tandojam, Pakistan. The experiments were a randomized complete block design in factorial combination, replicated three times. An experimental unit was accommodated with three factors i.e. seed priming sources (No seed priming, seeds priming with canal water, seed primed with 1.0% Urea, and seed primed with 0.2% ZnSO 4 ), planting geometries (i.e. 55 x 35 cm, 65 x 30 cm, 75 x 25 cm, and 85 x 20 cm), and sunflower varieties (HO-1 and Hysun-33). Analysis of data revealed a significant effect of seed priming, geometry, varieties, and their interactions on sunflower growth and yield components. The highest seed yield (kg ha -1 ) and oil content (%) were reported for seed primed with 0.2% ZnSO 4 , followed by seeds primed with 1.0% Urea. In case of planting geometry, the maximum seed yield (kg ha -1 ) and oil content (%) were noticed under planting geometry of 85 x 20 cm, followed by 75 x 25 cm. The variety HO-1 proved better in overall performance. The interaction of seed priming with 0.2% ZnSO 4 and planting geometry of 85 x 20 cm produced the highest seed yield (kg ha -1 ) and oil content (%), followed by seed priming with 0.2% ZnSO 4 and 75 x 25 cm planting geometry. It is concluded that sunflower yield could be enhanced substantially with seeds primed with 0.2% ZnSO 4 before sowing and arranged with planting geometry of 85 x 20 cm. The variety HO-1 is relatively a better option for sunflower cultivation under agro-climatic conditions of Tandojam, Pakistan.

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Optimizing nitrogen rate and planting density for sunflower under irrigated conditions of Punjab

Cited by 6 publications

References 6 publications

High Sunflower Densities as a Weed Control Strategy in an Integrated Crop-Livestock System

High Sunflower Densities as a Weed Control Strategy in an Integrated Crop-Livestock System

Effect of Different Tillage Practices in Sunflower (<em>Helianthus annuus</em>) Cultivation in a Crop Rotation System with Intercropping Triticosecale -Pisum sativum

Nutri-Seed Priming and Planting Geometry Effects on Growth and Oil Production of Sunflower Varieties under the Ecological Conditions of Tandojam, Sindh, Pakistan

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