Effect Of Different Nitrogen Doses Research Articles

Effect of different doses of nitrogen and inoculation with Azospirillum brasilense on the productive characteristics of maize

This study assessed the effects of different nitrogen doses on maize crops, with and without the inoculation of Azospirillum brasilense. The experiment was carried out during the 2020/2021 harvest season in the administrative department of Concepción, district of Horqueta, Paraguay, at the coordinates of 23°14'31.7" S and 56°53'05.9" W. The experiment followed a randomized complete block design (RCBD) arranged in a factorial design (4 X 2). Factor A included nitrogen doses (0, 40, 80, and 120 kg ha-1), while factor B corresponded to the bacterial inoculation (with and without A. brasilense). The experiment was performed in three replications; each experimental unit (EU) was 22.5 m2. The study evaluated the following characteristics: plant height, cob insertion height, cob length and diameter, weight of 1000 kernels, and kernel yield. The data were analyzed using analysis of variance (ANOVA), and the averages were compared using Tukey's test at a 5% probability of error. Regression analysis was also carried out during the study. The experiment results demonstrated that increased nitrogen levels positively affected the measured characteristics, fitting a quadratic model, except for cob insertion height. Inoculation with A. brasilense significantly increased corn growth and productivity. The interaction of both factors produced a significant increase in cob length. Based on the experiment results, applying 104.30 kg ha-1 of N in combination with A. brasilense inoculation is recommended for improved maize production.

Study the Interactive Effects of Different Nitrogen Doses and Spacing on Quality Characteristics of Coriander (Coriandrum sativum L.)

Coriander (Coriandrum sativum L.) is one of the most important spice crops worldwide, possessing varied medicinal impacts. It is majorly grown for its leaves; however, its seeds occupy a major place in various cuisines around the world. Several studies have reported the interactive effects of different nitrogen doses and spacing in coriander and provided valuable insights into the optimal conditions for its growth and development. In this sequence, the present study explores the effect of various nitrogen doses and spacing on coriander under field conditions at Research Farm of Vegetable Science, Chaudhary Charan Singh Haryana Agricultural University, Hisar (India) during Rabi, 2019-20. Amongst all the treatments, treatment S3N3 (40×15; N@75 kg/ha) was found best for harvest index, Test weight, Standard Germination, Seedling Length, Seedling Dry weight, Vigour Indices I & II, and S2N1 (30×15; N@50 kg/ha) for minimum Electrical Conductivity. Based on this study, the following treatments can be exploited for sustainable coriander production.

The effect of different nitrogen doses and water levels on the yield and yield components of cotton

This study was conducted to determine the effect of irrigation levels and nitrogen doses on yield and some yield parameters of Stoneville 468 cotton (Gossypium hirsutum L.) cultivar produced in semi-arid climatic conditions in 2017 and 2018 crop growing seasons with 3 replications utilizing the split plot design with random blocks. Five fertilizer (nitrogen) doses (0, 100, 150, 200 and 250 kg ha−1) and 4 irrigation percentages (25, 50, 75% and 100% of the field capacity) were used as treatments. In the experiment, the main plots were nitrogen doses, and the sub-plots were amounts of irrigation levels. In the first year of the experiment, a total of 1258 mm irrigation water was applied to the 100% trial (I100) while 1332 mm irrigation of water was applied. The results of study indicated that water stress caused a linear relationship between applied irrigation water amount and cotton seed yield, and the drip irrigation increased the nitrogen usage efficiency of the plants. As the amount of nitrogen rate and irrigation water applied was increased, plant height, the number of fruiting branches and bolls were increased. Whereas the amount of applied irrigation water, increased fiber length and the fiber length uniformity index but not fiber fineness according to the nitrogen dose application. Statistical analysis of water levels and nitrogen doses showed that 200 kg ha−1 pure nitrogen and I100 can be recommended.

Manejo de irrigação, interceptação luminosa e nitrogênio no cultivo do capim Tanzânia

ABSTRACT Management of nitrogen fertilization and light interception of pastures contributes to forage production in regions with low water availability. Therefore, the objective was to evaluate the effect of different nitrogen doses and light interception levels on the growth of Panicum maximum cv. Tanzania under different irrigation managements. The experiment was carried out in a greenhouse, using a factorial scheme (5 x 2 x 2), corresponding to five irrigation depths (40, 60, 80, 100, and 120% of actual evapotranspiration), two canopy light interception levels (90 and 95%), and two nitrogen doses (300 and 600 kg N ha-1 year-1). The highest biomass production occurs under irrigation with 120% of evapotranspiration. However, the best structural characteristics (tillering and number of leaves) occur with 100% of evapotranspiration, regardless of nitrogen dose and light interception level. Interruption of growth with 95% of incident light and fertilization with 600 kg N ha-1 year-1 promoted greater tillering, number of leaves and leaf length, regardless of the irrigation level. Tanzania grass management with an interruption of growth with 95% of incident light, 600 kg N ha-1 year-1, and irrigation with 80% of actual evapotranspiration led to tillering and number of leaves only 11% lower than the values found in the other treatments irrigated with 100% of actual evapotranspiration. Interruption of growth with 95% of incident light and fertilization with 600 kg N ha-1 year-1 improve the performance of Tanzania grass under deficit irrigation.

The Effect of Different Nitrogen Doses on Yield and Quality of Some Winter Canola (Brassica napus L.) Cultivars

This research was carried out to determine the effect of different nitrogen doses on yield and yield components of winter canola cultivars in Konya conditions during the winter canola growing vegetation period of 2019-2020. Three winter canola cultivars (Linus, PR44W29, Es Neptune) were used as material and six different nitrogen doses (0, 50, 100, 150, 200, 250 kg N ha-1) were applied. The research was established to according to the experimental design of split plots in randomized blocks. Half of the nitrogen fertilizer applications were given in the form of ammonium sulfate (21% N) at planting and the remaining half was given as urea (46% N) at the beginning of flowering. As a result of the study, it was determined that plant height, number of branch on the main stem, number of capsule per plant, capsule length, thousand seed weight seed yield, crude oil yield and crude protein ratio increased, while crude oil ratio decreased in winter canola varieties due to increasing nitrogen doses. As a matter of fact, the plant height values varied between 92.6 and 128.5 cm (respectively, LinusxN50 and PR44W29xN250), number of branch (no. main stem-1) of 2.4-5.7 (LinusxN0-PR44W29xN250), number of capsule (no. plant-1) of 103.9-218.9 (Es-NeptunexN0-PR44W29xN150), capsule size of 5.3-6.6 cm (Es-NeptunexN0-LinusxN250), number of seeds in the capsule of 22.5-30.0 (Es-NeptunexN100-PR44W29xN250), thousand seed weight between 3.2 and 4.7 g (PR44W29xN0-LinusxN200), seed yield of 1361-5373 kg ha-1 (Es-NeptunexN0-PR44W29xN250), crude oil yield between 547.0 and 2466.0 kg ha-1 (Es-NeptunexN0- PR44W29xN150) and crude protein ratio values ranged of 16.2 23.9% (Es-NeptunexN0-LinusxN200).It was determined that there were increases in the values of these properties with increasing nitrogen doses in general. In terms of crude oil ratio, the lowest value was determined at PR44W29xN0 with 39.2%, and the highest value was determined at PR44W29xN50 with 46.3%. It has been determined that there are relatively decreases in crude oil ratios with increasing nitrogen doses. The main purpose of cultivation of oil seed crops is to increase the oil yield per unit area. From this point of view, it was concluded that PR444W29 cultivar among the cultivars considered in the study would be more suitable in terms of oil yield with 150 kg N ha-1 application for the regions similar to the conditions in which the study was conducted.

Response of maize (Zea mays L.) to different nitrogen doses under the mild tropical plain agroclimatic zone of North-East India

Formulating optimum quantity of nitrogen fertilization is highly necessary to attain higher yields in maize. As per soil fertility, the right dosage has to be formulated for each region with consciousness on the soil and environmental health. A field experiment was conducted during 2018-19 under mild tropical plain agroclimatic conditions of Arunachal Pradesh, India to investigate the effect of different nitrogen doses on growth and yield of maize. The experiment was laid out under randomized block design with five replicated plots for each treatment. The nitrogen through urea was supplied with different doses of 0, 100, 120, 150 and 180 kg/ha. The crop was evaluated for plant height, number of leaves, leaf length, number of kernels per cob, number of rows per cob, and total grain yield. The results revealed that the variables such as plant height, number of leaves, leaf length, number of kernels per cob, number of rows per cob and total grain yield were significantly (P less than 0.05) affected by the different levels of nitrogen doses. Number of leaves, leaf length and crop yield were highest in 180 kg/ha (nitrogen dose), while lowest in control which significantly increased with higher nitrogen doses. This result showed that nitrogen with higher doses was more effective than low doses for maize crop. Nitrogen fertilization at 180 kg/ha exerted a significantly higher and positive effect on maize growth and can be recommended for the region.

Effects of different nitrogen doses and cultivars on some nutritive value of annual ryegrass (Lolium multiflorum var. westerwoldicum) silage

Objective: The objective of this study was to determine the effects of different nitrogen doses and cultivars on some nutritive value of annual ryegrass (Lolium multiflorum var. westerwoldicum) silage. Material and Methods: The study was conducted as a field experiment at Ege University, Department of Field Crops during the growing season of 2019-2020. Four annual ryegrass cultivars (Elif, Big Boss, Baquend, and Medoacus) and five nitrogen doses (0, 75, 150, 225, and 300 kg ha-1) were investigated. Some characteristics tested in the experiment were silage dry matter, crude ash, crude protein contents, NDF and ADF contents and silage RFV. Results: The characteristics studied were affected by the applications. While the highest silage dry matter ratio was obtained with 225 kg N ha-1, 300 kg N ha-1 application gave the highest crude protein rate and RFV. The lowest NDF and ADF rates were obtained at a fertilizer rate of 300 kg N ha-1 application. Baquend cv. gave the highest silage dry matter ratio and crude ash ratio.The highest crude protein ratio, lowest NDF and ADF ratios and highest silage RFV were obtained from Elif cv. Conclusion: Elif cultivar had acceptable silage properties at a nitrogen dose of 225 kg ha-1.

Determination of the Effect of Different Nitrogen Doses on the Yield, Yield Components and Chlorophyll Contents of Bread Wheat (Triticum aestivum L.) Cultivars using Artificial Neural Network

This research investigates an artificial neural network for predicting the chlorophyll concentration index and the effect of different nitrogen doses on the yield, yield components of Bread Wheat (Triticum aestivum L.). Plants were fertilized with 5, 10, 15, 20, and 25 kg da-1 nitrogen doses. The chlorophyll concentration index of each leaf was measured using a SPAD meter. The coefficient of determination values was found to be 0.99. In artificial neural network modeling, chlorophyll concentration values were estimated with SPAD readings. Artificial neural network modeling successfully described the relationship between actual chlorophyll concentration index values and predicted chlorophyll concentration index values. Agronomic parameters plant height (110.66-92.73 cm), the number of spikes per square meter (461.01-355.50), the number of seeds per spike (43.88-23.83), the weight of seed per spike (2.07-0.91 g), hectoliter weight, thousand-grain weight (43.10-35.89 g), grain yield (638.76-343.06 kg.da-1), protein contents (11.16-8.34 %), the value of sedimentation (19.40-11.94) were found statistically important.

Deciphering the effect of different nitrogen doses on grain protein content, quality attributes and yield related traits of rice

Understanding the gravity of nutritional significance of rice (Oryza sativa L.) protein, an experiment conducted in Randomized Complete Block Design (RCBD) involving effect of nitrogen (N) rates i.e.,140 kg N/ha, 120 kg N/ha, 100 kg N/ha and 80 kg N/ha on grain protein content, yield parameters and cooking characteristics of polished rice from eight rice genotypes was conducted. N application significantly affected the grain protein content, grain yield, head rice recovery, plant height and effective tillers. In high protein cultivars substantially low to intermediate amylose content and more cooking time was recorded while in low protein counterpart amylose content was comparatively high with low cooking time. Maximum cooking time in polished rice was of 25 min at 180 kg N/ha dose and highest amylose content of about 27% at 80 kg N/ha. Gumminess and hardness of cooked rice and cooking time significantly elevated with increase in N dose. The substantial differences in grain protein content in brown, polished and cooked rice was observed. Cooking revealed the significant increase in protein content ranged from 50%-70% in low protein to high protein genotypes. R-RGM-ATN-47 with highest grain yield of 62.13 q/ha, grain protein content of 10.00 % in polished rice and intermediate amylose appears to be the most promising candidate.

Effects of different nitrogen doses on thymoquinone and fatty acid composition in seed oil of black cumin (Nigella sativa L.)

AbstractBlack cumin, Nigella sativa L. belonging to Ranunculaceae, is a valuable medicinal plant because of the curative effects of seed and oil. Despite studies on black cumin, there are few studies on the effects of nitrogen on fatty acid composition, no records on thymoquinone yield, and the thymoquinone content of the seed oil. In this study, the effects of different nitrogen doses on the seed oil yield, thymoquinone ratio/yield, and fatty acid compositions were investigated. Field studies with nitrogen doses (0, 40, 60, 80, and 100 kg/ha) were studied using the randomized plot design. As a result of the research, nitrogen doses significantly affected the oil and thymoquinone yields while insignificant on the thymoquinone ratio. The highest oil yield with 501.6 kg/ha was obtained from 80 kg/ha of the nitrogen doses, while the highest thymoquinone yield with 10.24 kg/ha was obtained from the control plots. Thymoquinone yields were in the same statistical group with other nitrogen doses, except for means of 100 kg/ha nitrogen doses. Linoleic, oleic, and palmitic acids were major fatty acids of black cumin, and their variations were insignificant in nitrogen applications. The values of butyric, capric, and linolenic acids varied significantly in different nitrogen doses. As a result of the study, it was determined that the highest oil yield was obtained from 80 kg/ha nitrogen application. It has been determined that nitrogen doses above 60–80 kg/ha should be avoided for the seed oil and thymoquinone yields in black cumin.

The Effect of Different Nitrogen Doses on Yield and Yield Components of Basil (Ocimum basilicum L.) Plant

Bu araştırmada, farklı azot dozlarının (0, 3, 6, 9, 12 ve 15 kg da-1) reyhan (Ocimum basilicum L.) ‘ın verim ve verim öğeleri üzerine etkisinin belirlenmesi amaçlanmıştır. Çalışma tesadüf blokları deneme desenine göre 3 tekerrürlü olarak Eskişehir ekolojik koşullarında 2019-2020 yıllarında yürütülmüştür. Çalışmada bitki boyu, taze herba verimi, taze ve kuru yaprak verimleri, uçucu yağ oranı ve uçucu yağ verimi incelenmiş, farklı azot dozlarının incelenen tüm parametrelerin üzerine etkisi önemli bulunmuştur. Deneme sonucunda (2019 ve 2020 yılları ortalaması) taze herba verimi, taze yaprak verimi, kuru yaprak verimi ve uçucu yağ verimi sırasıyla 748.00-1617.80 kg da-1, 449.55-1062.40 kg da-1, 89.76-166.63 kg da-1 ve 0.79-1.24 L da-1 arasında değişmiştir. Uçucu yağ oranları ise %0.72-0.88 arasında belirlenmiştir. Çalışmadan elde edilen sonuçlar dikkate alındığında, Eskişehir ve benzer ekolojik koşullarda reyhan (Ocimum basilicum L.) yetiştiriciliğinde kuru yaprak üretimi için 12 kg da-1, uçucu yağ üretimi için ise 9 kg da-1 azot dozu tavsiye edilebilir.

The influence of nitrogen doses on yield and yield properties of safflower (Carthamus tinctorius) varieties under micro-climate conditions of Igdir plain – Turkey

The growth and development of safflower are affected by several factors such as genotype, agronomic practices, and environmental conditions. One of the most important agronomic practices is fertilization. As a fertilizer, nitrogen is a basic element required for successful plant growth. In the study, it was aimed to determine the effects of different nitrogen doses (0, 100, 150, and 200 kg ha−1) on yield and yield properties of three safflower varieties (Remzibey-05, Dinçer, and Yenice) under micro-climate conditions in the Iğdır University Agricultural Research fields, Turkey during 2012 − 2013 according to the split-plot experimental design in randomized blocks with three replications. The investigation denoted that the differences among the varieties were found significant for all attributes except seed number per head. And also, the effect of differences between observation years and the effects of nitrogen rates were determined to be significant for all observed properties. Increasing the nitrogen rate increased all observed attributes. Seed oil content increased with nitrogen applications up to 100 kg ha−1 but reduced again in higher nitrogen rates. In the study, the interactions of both factors had no significant effects on all observed attributes. The results of two years study show that the Yenice safflower cultivar as an alternative oil plant and the most economical nitrogen dose of 150 kg ha−1 can be suggested for the maximum yield in the unit area where the experiment is carried out and in other regions with similar climatic conditions.

Nitrogen Fertilization Affects Growth, Yield, Nitrate and Mineral Content of Garden Cress (Lepidium sativum L.)

Garden cress is rich in carotenoids, vitamin C, fiber, flavonoids, selenium, s-methyl cysteine, sulfoxide and glucosinolates. Nitrogen deficiency is a limiting factor for plant growth. The study was conducted in Atatürk University, in Erzurum under field conditions in 2013 and 2014. The aim of the present study was to evaluate effects of the different ratios of nitrogen on growth, yield and some quality properties of garden cress (cv. Dadaş). Treatments consisted of Nmin (mineral nitrogen in the soil layer 0–30 cm at planting; i.e. no basal nitrogen fertilization) (Control), 50, 100 and 150 kg N ha-1 doses as ammonium nitrate. The effect of different nitrogen doses on the plant height and yield in the cress was statistically significant. The highest plant height and yield was observed in 100 kg N ha-1. Generally, NO3 and the other elements in garden cress increased with increasing nitrogen doses. In conclude 82.17 kg N ha-1 can be suggested for higher yield and quality for Dadaş garden cress variety in sand soil conditions according to the regression analysis.

Effects of nitrogen fertilization on growth and yield of diterpene glycosides in stevia (Stevia rebaudiana Bertoni)

The effects of different nitrogen doses on dry weight yield, stevioside and rebaudioside A contents, and yields were evaluated in stevia (Stevia rebaudiana Bertoni). This study was carried out at the Instituto Federal Catarinense, Rio do Sul (SC), Brazil, under decreasing photoperiods. A randomized complete block design with four blocks and five treatments (0, 65, 135, 200 and 270 kg ha-1 N) was used. Variables related to dry weight yield (total dry weight, leaf dry weight, stem dry weight, number of secondary branches and tertiary branches, and main stem length), growth rates (total leaf area, leaf area index, specific leaf area, leaf area ratio, leaf weight ratio), and stevioside and rebaudioside A contents and yields were evaluated. The doses of nitrogen fertilization did not affect the variables related to dry weight yield, stevioside and rebaudioside A contents and yields, or rebaudioside A:stevioside ratio in stevia genotype 8 (G8), grown under decreasing photoperiods.

Farklı Azot Dozlarının Krotalarya (Crotalaria juncea L.)’da Verim ve Diğer Bazı Verim Özellikleri Üzerine Etkisi

Bu araştırma, farklı azot dozlarının (0, 3, 6, 9, 12, 15 kg/da) Krotalarya (Crotalaria juncea L.) bitkisinde verim ve bazı verim özellikleri üzerine olan etkisini incelemek amacıyla 2018 yılında Ege Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü’nün Bornova/İzmir’deki deneme alanlarında yürütülmüştür. Araştırmada; bitki materyali olarak yurtdışından temin edilen Tillage Sunn çeşidi kullanılmış ve bitki boyu, sap çapı, dal sayısı, yaprak sayısı, yeşil ve kuru ot verimi, kuru madde oranı ve kuru madde verimi gibi özellikler incelenmiştir. Elde edilen verilere göre; 12 kg/da azot uygulamasında 5221 kg/da ile en yüksek yeşil ot verimi, 1553 kg/da ile en yüksek kuru ot verimi, 216,4 cm ile en yüksek bitki boyu, 13,67 mm ile en yüksek sap çapı, 5,73 adet ile en fazla dal sayısı, 167,9 adet ile en fazla yaprak sayısı elde edilmiş ve Krotalarya yetiştiriciliğinde optimum miktarda azot uygulamasının gerekli olduğu ve Akdeniz iklim koşulları altındaki Bornova ovasında en ideal azot dozunun 12 kg/da olduğu sonucuna varılmıştır.

Effects of Different Nitrogen Dose and Sources as Top-Dressing on Yield and Silage Quality Attributes of Silage Maize

Effects of different nitrogen doses and sources applied as top-dressing on dry matter yield and quality of maize silage were investigated in this study. Along with 7.5 kg N da-1 application as starter at sowing in the form of 15-15-0+Zn, nitrogen doses of 0, 7.5, 15 and 22.5 kg da-1 were applied as top-dressing at 6-leaf stage of plants in the forms of ammonium nitrate, urea, DMPP blended ammonium sulphate nitrate and urea with NBPT urease inhibitor. Experiments were conducted in randomized blocks-factorial experimental design with 3 replicates in 2013 and 2014. The greatest dry matter yield were obtained from 15 and 22.5 kg N da-1 in 2013 and from 22.5 kg N da-1 in 2014. Nitrogen sources had also significant effects on dry matter yield. According to the average of two years, both DMPP blended ammonium sulphate nitrate and urea with NBPT urease inhibitor increased yield respectively by 7 and 3% as compared to ammonium nitrate and urea fertilizers. Nitrogen doses significantly improved the silage quality attributes. Nitrogen treatments increased silage protein ratio and decreased ADF and NDF ratios of silage samples. The greatest relative feed value was obtained from 15 kg N da-1 treatment. It was concluded based on present findings that besides the nitrogen doses, nitrogen sources also significantly improved yield.

Effect of Different Nitrogen Doses and Deficit Irrigation on Nitrogen use Efficiency and Growth Parameters of Tomato Crop under Drip Irrigation System

Effect of Different Nitrogen Doses and Deficit Irrigation on Nitrogen use Efficiency and Growth Parameters of Tomato Crop under Drip Irrigation System

Nitrogen and sulfur Association: Effects on Yield Components and Physical Attributes of Wheat Seeds

The aimed to evaluate the effect of different nitrogen doses in association with sulfur fertilization on yield components and seeds physic-quality attributes. The experimental design was randomized blocks, arranged in a 3 × 5 × 2 factorial design (cultivar × nitrogen doses × sulfur management), with four replications. The analysis of variance revealed that wheat cultivars × sulfur management interaction was significant for height insert of main spike. Interaction was verified between cultivars × nitrogen doses for number of tillers per plant and number of spikes per m2. The nitrogen doses × sulfur management interaction was significant for number of tillers per plant. Interaction between cultivars × nitrogen doses were observed for number of spicules per spikes and number of seeds per spike. Nitrogen fertilization has different effects on wheat cultivars. The cultivar ‘TBIO Sinuelo’ presents greater seeds yield with improvement of nitrogen fertilization doses. High nitrogen doses provide increasing of wheat seeds yield. Nitrogen doses influence differently on yield components of wheat. Number of tillers per plant is correlated with seeds yield. Physical attributes of wheat seeds are not influenced by nitrogen doses increasing. Sulfur fertilization promotes tillering and increment of number of spicules per spike. The cultivar ‘TBIO Sinuelo’ presents higher weight per 1000 seeds, followed by ‘Jadeíte 11’, and ‘TBIO Sintonia’.

Response of Some New Wheat Genotypes to Nitrogen Fertilization and Prospects of Yield Breeding Based on Yield Elements

Fertilizing wheat with nitrogen plays an important role in obtaining high yield and quality. In Romania’s environmental conditions, data regarding nitrogen fertilization are reported in various studies at different N levels. The aim of this research was to study the effect of different nitrogen doses on yield and quality of several new mutant/recombinant lines of winter wheat. Field trials were carried out in south of Romania during 2015-2017 in a rape-wheat rotation. The design of the yield trial was as complete randomised blocks with four replications and included two factors: A – three variants of fertilization (N0, N50 and N100) and B – genotype (line). At harvest, the number of grains per spike, grain weight/spike, thousand grain weight, grain yield and hectolitre weight were analysed. In variants fertilized with N100 the highest values for all studied parameters (yield – 5104.55 kg/ha; grains weight/spike – 3.35 g; TGW – 48.31g; HW – 78.76; number of grains/spike – 58.35) were registered. These results confirm good efficiency of N application. Principal component analysis revealed that seven variants, which had both positive components were fertilized with N100 and were all ranked in firsts seven position in the yield classification.

Influence of nitrogen fertilization on the seed yield and the content and quality of fat in pot marigold (Calendula officinalis L.) cultivars

Pot marigold seeds contain oil with a specific composition (presence of calendic acid); hence, they can be used as an alternative oil raw material. In 2011–2013, a field experiment was conducted to determine the effect of different nitrogen doses (0, 30, 60, 90, 120, 150 kg N∙ha-1) on the seed yield, oil content, and fatty acid composition in four pot marigold cultivars. Nitrogen fertilization exerted a positive effect on the number of flower heads and seed yield. However, the response of marigold cultivars to nitrogen doses applied varied, i.e. the yield of the ‘Tokaj’ and ‘Radio’ cultivars was significantly increased up to the dose of 60 kg N∙ha-1, whereas such an increase was noted in the ‘Orange King’ and ‘Persimmon Beauty’ cultivars at the dose of 90 kg N∙ha-1. Nitrogen fertilization modified the content of fat: the low nitrogen doses (30 kg N∙ha-1) did not influence the fat content in the seeds, whereas the increasing doses resulted in its gradual decline. The cultivars were characterised by significant differences in plant morphology, seed yield, and fat quality. During the three-year period, the highest seed and fat yields were determined for the ‘Orange King’ cultivar (1857.3 and 339.3 kg·ha-1, respectively) and the highest proportion of calendic acid in the oil (54.86%) was detected in the ‘Persimmon Beauty’ cultivar. The yield and quality of marigold oil depended on both nitrogen fertilization and the weather conditions prevailing during the growing seasons. The increase in the nitrogen doses was accompanied by an increase in the content of linoleic acid and a decrease in the level of oleic acid. The cooler and wetter growing season in 2011 turned out to promote the highest fat and calendic acid accumulation.