Factors affecting nitrogen concentration in spring oilseed rape (Brassica napus L.)

Šidlauskas, G.; Tarakanovas, P.

doi:10.17221/4026-pse

Cited by 29 publications

(26 citation statements)

References 14 publications

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“…Although rapeseed yields varied with different environmental variables [28], there was only one season's result, the experiments were located in different counties, and the weather conditions at the specific sites were different. Indeed, further pairing experiments depending on soil characters and weather conditions should also be performed to study the critical processes of soil nutrient supply in different rotations.…”

Section: Seed Yield and Yield Responses To Fertilizer Applicationsmentioning

confidence: 99%

Crop rotation-dependent yield responses to fertilization in winter oilseed rape (Brassica napus L.)

Ren¹,

Li²,

Lü³

et al. 2015

The Crop Journal

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Differences in soil physical, chemical and biological properties between paddy-upland and continuous upland rotations will influence nutrient relations and crop growth. With the aim of estimating rapeseed yield performance in response to fertilization in rice-rapeseed (RR) and cotton-rapeseed (CR) rotations, on-farm experiments were conducted at 70 sites across Hubei province, central China. The economically optimal fertilizer rates of winter oilseed rape in different rotations were determined. Field experiments showed that previous crops significantly influenced seed yields. Without N fertilization, seed yields were significantly lower for the RR rotation than for the CR rotation. The average yield increase ratio and agronomic efficiency associated with nitrogen (N) fertilization in the RR rotation were 96.6% and 6.56 kg kg −1 , significantly higher than those in the CR rotation. No seed yield differences were detected between the two rotations under phosphorus (P) and potassium (K) fertilization. In contrast to the CR rotation, N fertilizer played a more vital role in maintaining high seed yields in the RR rotation owing to the lower indigenous soil N supply. Compared with local N fertilizer recommendation rates for the RR rotation, on average an additional 18 kg N ha −1 was recommended according to the economically optimal N fertilizer rate (EONFR). In contrast, the EONFR was 14 kg N ha −1 lower than the locally recommended N fertilizer rate for the CR rotation. There were no differences between the two rotations for the average economically optimal P and K fertilization rates.Consequently, the average EONFR of winter oilseed rape could be reduced if cotton rather than rice preceded the winter oilseed rape.Please cite this article as: T. Ren, et al., Crop rotation-dependent yield responses to fertilization in winter oilseed rape (Brassica napus L.), The Crop Journal (2015), http://dx.

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Section: Seed Yield and Yield Responses To Fertilizer Applicationsmentioning

confidence: 99%

Crop rotation-dependent yield responses to fertilization in winter oilseed rape (Brassica napus L.)

Ren¹,

Li²,

Lü³

et al. 2015

The Crop Journal

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“…Zhang et al (2006) also reported that the average height of rape suitable for mechanized harvesting was about 160 cm. LD planting promoted plant growth and development, which led to taller and bigger plants with more branches and pods per plant, and required more N than HD planting (Sidlauskas and Tarakanovas 2004;Leach et al 1999). Plants grown at higher densities are thinner, carry fewer branches and fewer pods, and are more tidy in plant structure type than those grown in low densities (Mobasser et al 2008).…”

Section: Optimum Planting Density Contributes To Mechanized Harvestinmentioning

confidence: 99%

High planting density benefits to mechanized harvest and nitrogen application rates of oilseed rape (Brassica napusL.)

Zhu

et al. 2014

Soil Science and Plant Nutrition

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To evaluate the effects of planting density and nitrogen (N) application rate on agronomic characters, yield and N use of oilseed rape (Brassica napus L.), a split plot experiment was carried out. Two planting densities (1.5 × 10 5 plant ha −1 and 4.5 × 10 5 plant ha −1 as main plots) and four N rates (0, 90, 180 and 270 kg ha −1 as sub plots) were designed for two cultivars of Brassica napus. Results indicate that increased planting density could lead to decreased plant height, branch number, canopy layer thickness, effective siliques per plant and harvest index, while branch height and N use efficiency increase. Under a single density, plant height, branch height, branch number, effective siliques per plant and yield increased with increased N application, but the oil content and N use efficiency decreased. For the same target yield (plateau yield) obtained in low-density planting, the N fertilizer requirement decreased by 22.8% and 25.4% in high-density planting in two experimental sites. On the whole, these results demonstrate that increased plant density can improve rape adaptability for mechanized harvest by regulating plant structure, decreasing the N requirement for reaching a target yield and increasing N use efficiency.

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“…However, plant requirements for N vary with cultivar, growth stage of plant, N utilization efficiency, soil type, climate, and type of N application (Sidlauskas and Bernotas, 2003; Berry et al, 2010). Previous studies aimed to optimize the rate of N to increase rapeseed yield (Kazemeini et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Nitrogen Rate and Planting Density for Improving Yield, Nitrogen Use Efficiency, and Lodging Resistance in Oilseed Rape

et al. 2017

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Yield and lodging related traits are essential for improving rapeseed production. The objective of the present study was to investigate the influence of plant density (D) and nitrogen (N) rates on morphological and physiological traits related to yield and lodging in rapeseed. We evaluated Huayouza 9 for two consecutive growing seasons (2014–2016) under three plant densities (LD, 10 plants m−2; MD, 30 plants m−2; HD, 60 plants m−2) and four N rates (0, 60, 120, and 180 kg ha−1). Experiment was laid out in split plot design using density as a main factor and N as sub-plot factor with three replications each. Seed yield was increased by increasing density and N rate, reaching a peak at HD with 180 kg N ha−1. The effect of N rate was consistently positive in increasing the plant height, pod area index, 1,000 seed weight, shoot and root dry weights, and root neck diameter, reaching a peak at 180 kg N ha−1. Plant height was decreased by increasing D, whereas the maximum radiation interception (~80%) and net photosynthetic rate were recorded at MD at highest N. Lodging resistance and nitrogen use efficiency significantly increased with increasing D from 10 to 30 plants m−2, and N rate up to 120 kg ha−1, further increase of D and N decreased lodging resistance and NUE. Hence, our study implies that planting density 30 plants m−2 can improve yield, nitrogen use efficiency, and enhance lodging resistance by improving crop canopy.

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Factors affecting nitrogen concentration in spring oilseed rape (Brassica napus L.)

Cited by 29 publications

References 14 publications

Crop rotation-dependent yield responses to fertilization in winter oilseed rape (Brassica napus L.)

Crop rotation-dependent yield responses to fertilization in winter oilseed rape (Brassica napus L.)

High planting density benefits to mechanized harvest and nitrogen application rates of oilseed rape (Brassica napusL.)

Optimization of Nitrogen Rate and Planting Density for Improving Yield, Nitrogen Use Efficiency, and Lodging Resistance in Oilseed Rape

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