Comparison of Growth Indices of Nigella sativa L. under Different Plant Densities and Fertilization

Roussis, Ioannis; Kakabouki, Ioanna; Bilalis, Dimitrios

doi:10.9755/ejfa.2019.v31.i4.1934

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…The effects of the plant density and fertilization on the biomass nitrogen (N) content of N. sativa are presented in Table 7. The maximum values were achieved in the timespan between blooming and full flowering (75 DAS) [44]. In the low-density plants, the values of biomass N content were substantially higher (3.08, 3.25, and 3.13%N in 2017, 2018, and 2019, respectively) than the high-density treatment (2.74, 2.86 and 2.81%N for the respective years).…”

Section: Nitrogen Content and Uptake In The Aerial Components Of N Sa...mentioning

confidence: 94%

Nitrogen Uptake, Use Efficiency, and Productivity of Nigella sativa L. in Response to Fertilization and Plant Density

Roussis

Kakabouki

Beslemes³

et al. 2022

Sustainability

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Nigella sativa L. has been recognized as one of the most important medicinal plants in many parts of the world for centuries. The purpose of the current study was to evaluate the effects of fertilization and plant density on nitrogen uptake, utilization efficiency, and productivity of N. sativa under Mediterranean conditions. The three-year experiment was set up in a split-plot design with three replications. There were 2 plant densities; 200 and 300 plants m−2 with 4 fertilization levels: control, seaweed compost, farmyard manure and inorganic fertilizer. The highest seed yield (749–840 kg ha−1) was found in plants subjected to low-density and inorganic fertilization. The seed nitrogen (N) uptake as well as the nitrogen harvest index (NHI) were positively affected by the increase of available nitrogen and negatively by the increase of plant density, with their highest values recorded in the low-density and inorganic fertilization. In conclusion, plant densities greater than 200 plants m−2 result in higher crop growth but lower seed yield and decreased nitrogen uptake and use efficiency in N. sativa seeds, whereas the application of inorganic fertilizers increases crop yield, nitrogen uptake, and utilization efficiency because these fertilizers present higher nitrogen levels with higher solubility and thus faster availability for the crop in comparison with organic fertilizers.

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Section: Nitrogen Content and Uptake In The Aerial Components Of N Sa...mentioning

confidence: 94%

Nitrogen Uptake, Use Efficiency, and Productivity of Nigella sativa L. in Response to Fertilization and Plant Density

Roussis

Kakabouki

Beslemes³

et al. 2022

Sustainability

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“…Initially, LAR values were higher in the early stage (30 DAS), gradually declining at 60 DAS, followed by a steep decrease at 90 DAS. LAR provides insights into the efficiency of a system in growth, reflecting the ratio of photosynthesizing to respiring material within the plant [30].…”

Section: Leaf Area Ratio (Cm 2 /G × 10 -2 )mentioning

confidence: 99%

Performance of Chia (Salvia hispanica L.) under Spacing and Nutrient Management Practices in Cauvery Command Area

Pravalika K. M.,

Yogananda S. B.,

Thimmegowda P.

et al. 2024

IJECC

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An investigation was carried out at the Zonal Agricultural Research Station, Vishweshwaraiah Canal Farm, Mandya, Karnataka, spanning from September to December in both 2020 and 2021. The purpose was to analyze how varying spacing and nutrient management practices affect the yield and growth rate of chia plants. The study involved two different spacings (S) and six levels of organic nutrients (N). Employing a 2 × 6 × 3 factorial experiment design within a randomized complete block framework with three replications, the experiment was conducted over a two-year period. The spacing of 60 cm × 15 cm (S2) resulted in notably higher absolute growth rates (1.00 and 1.87 g/day, respectively at 30 – 60 and 60 – 90 DAS) and biomass duration (221.84, 893.45 and 2182.73 days, respectively at 0 – 30, 30 – 60 and 60 – 90 DAS). Conversely, for relative growth rate (1.67 and 1.19 g/g/day × 10-2, respectively at 30 – 60 DAS and 60 – 90 DAS) and leaf area ratio (2180.90, 1967.19 and 1522.35 cm2/g × 10-2, respectively at 30, 60 and 90 DAS), higher values were observed with 45 cm × 15 cm spacing (S1). Among the various organic nutrient levels, the highest absolute growth rate (1.09 and 2.01 g/day, respectively at 30 – 60 and 60 – 90 DAS) and biomass duration (259.18, 1009.48 and 2403.23 days, respectively at 0 – 30, 30 – 60 and 60 – 90 DAS) were recorded with N6, while greater relative growth rate (1.86 and 1.20 g/g/day × 10-2, respectively at 30 – 60 DAS and 60 – 90 DAS) and leaf area ratio (2616.15, 2206.54 and 1723.31 cm2/g × 10-2, respectively at 30, 60 and 90 DAS) were found with N1. The interaction between spacing and organic nutrient levels did not yield any significant differences with respect to absolute growth rate, biomass duration, relative growth rate and leaf area ratio.

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“…Soil nutrients and texture are important factors on the regional SOC. A h trient content is beneficial for crop growth, allowing more residues to return [51,52]. Therefore, soil nutrients are often positively related with the SOC [53 pared with a high sand content, a high clay content is beneficial for maintainin ture and nutrients, promoting vegetation growth and organic matter ac [55,56].…”

Section: Impact Of Environmental Variables On Soc Variationmentioning

confidence: 99%

“…Soil nutrients and texture are important factors on the regional SOC. A high soil nutrient content is beneficial for crop growth, allowing more residues to return to the soil [51,52]. Therefore, soil nutrients are often positively related with the SOC [53,54].…”

Section: Impact Of Environmental Variables On Soc Variationmentioning

confidence: 99%

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Chen

Zhu

et al. 2023

Land

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Accurately mapping soil organic carbon (SOC) is conducive to evaluating carbon storage and soil quality. However, the high spatial heterogeneity of SOC caused by river-related factors and agricultural management brings challenges to digital soil mapping in floodplain farmland. Moreover, current studies focus on the non-linear relationship between SOC and covariates, but ignore the effective range of environmental variables on SOC, which prevents the revelation of the SOC differentiation mechanism. Using the 375 samples collected from the Jiangchang Town near Han River, we aim to determine the main controlling factors of SOC, reveal the effective range of environmental variables, and obtain the spatial map of SOC by using the gradient boosting decision tree (GBDT) model and partial dependence plots. Linear regression was used as a reference. Results showed that GBDT outperformed linear regression. GBDT results show that the distance from the river was the most important SOC factor, confirming the importance of the Han River to the SOC pattern. The partial dependence plots indicate that all environmental variables have their effective ranges, and when their values are extremely high or low, they do not respond to changes in SOC. Specifically, the influential ranges of rivers, irrigation canals, and rural settlements on SOC were within 4000, 200, and 50 m, respectively. The peak SOC was obtained with high clay (≥31%), total nitrogen (≥1.18 g/kg), and total potassium contents (≥11.1 g/kg), but it remained steady when these covariates further increased. These results highlight the importance of revealing the effective range of environmental variables, which provides data support for understanding the spatial pattern of SOC in floodplain farmland, achieving carbon sequestration in farmland and precision agriculture. The GBDT with the partial dependence plot was effective in SOC fitting and mapping.

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Comparison of Growth Indices of Nigella sativa L. under Different Plant Densities and Fertilization

Cited by 5 publications

References 13 publications

Nitrogen Uptake, Use Efficiency, and Productivity of Nigella sativa L. in Response to Fertilization and Plant Density

Nitrogen Uptake, Use Efficiency, and Productivity of Nigella sativa L. in Response to Fertilization and Plant Density

Performance of Chia (Salvia hispanica L.) under Spacing and Nutrient Management Practices in Cauvery Command Area

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

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