Comparing the Nitrogen and Potassium Requirements of Canola and Wheat for Yield and Grain Quality

Brennan, Ross; Bolland, M. D. A.

doi:10.1080/01904160903308127

Cited by 43 publications

(26 citation statements)

References 29 publications

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“…In addition, soil indigenous P and K supplies were similar for these two rotations. It should be noted that the average fertilizer contributions to yield were 19.9% and 14.5% for the RR rotations and 21.2% and 17.8% for the CR rotations, indicating that optimal P and K fertilizations were still essential for achieving high seed yields from oilseed rape production, in agreement with the results of other studies [37,38]. Furthermore, soil P availability decreased when the soil was converted from flooding to drying, owing to the production of large amounts of amorphous iron [39].…”

Section: Seed Yield and Yield Responses To Fertilizer Applicationssupporting

confidence: 82%

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 Applicationssupporting

confidence: 82%

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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“…Supplemental K fertilizer has been reported to produce a significant increase (4.1%) in the seed oil (Singh et al, 1997). In contrast, some experiments have shown that the oil concentration is not consistently influenced by the K addition (Tang and Guan, 2001;Govahi and Saffari, 2006;Brennan and Bolland, 2009). Even in Khan's study (Khan et al, 2004), the oil concentration decreased with increasing K levels.…”

Section: Effects Of K-fertilizer Application On Yield and Qualitymentioning

confidence: 89%

Potassium‐fertilizer management in winter oilseed‐rape production in China

Ren

Lü

et al. 2013

Z. Pflanzenernähr. Bodenk.

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Optimal potassium (K) fertilization is beneficial for oilseed-rape (Brassica napus L.) yield and quality. However, the discrepancy between the high K demand of winter oilseed rape and low soil fertility and insufficient potassium input has limited the sustainable development of oilseedrape production. A series of on-farm experiments in the key winter oilseed-rape domains of China was conducted from 2004 to 2010 to evaluate K-fertilizer management for winter oilseed rape. Currently, the average NH 4 OAc-extractable K content in the 0-20 cm soil layer is 89.1 mg kg -1 indicative of "slight deficiency". In addition, farmers in China usually fail to use sufficient K fertilizer in oilseed-rape production, the average mineral-potassium-fertilizer input in 2010 being only 35 kg K ha -1 , far lower than the recommended rate of potassium for winter oilseed rape. Adequate potassium fertilization significantly raises seed yield. The average yieldincrease rate for the major production regions due to K-fertilizer application was 18.5%, and the average K fertilizer-use efficiency 36.1%. Based on the negative correlation between yield response to potassium fertilization and available soil K content, a soil-K-test index was established for winter oilseed rape with a threshold value for NH 4 OAc-extractable soil K of 135 mg kg -1 . When available soil K-content is below this threshold value, more K fertilizer should be applied to achieve high seed yield and to increase soil fertility. The major challenge for K-fertilizer management in winter oilseed-rape production in China will be to guide farmers in the different regions in making reasonable use of K fertilizer through soil K-testing technology in order to maintain both seed yield and soil fertility.

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“…Brennan and Bolland [32] reported 32% higher potassium (K) requirements of oilseed rape than wheat (Triticum aestivum) for the production of maximum seed yield. At the same K application rate, the concentration of K in shoots was greater for rapeseed than for wheat [33].…”

Section: Discussionmentioning

confidence: 99%

The Response of Macro- and Micronutrient Nutrient Status and Biochemical Processes in Rats Fed on a Diet with Selenium-Enriched Defatted Rapeseed and/or Vitamin E Supplementation

Rýdlová

Růnová

Száková

et al. 2017

BioMed Research International

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The response of nutrient status and biochemical processes in (i) Wistar and (ii) spontaneously hypertensive (SHR) rats upon dietary intake of selenium- (Se-) enriched defatted rapeseed (DRS) and/or vitamin E fortification was examined to assess the health benefit of DRS in animal nutrition. Twenty-four individuals of each type of rat were used: The control group was fed with an untreated diet (Diet A). In Diets B and C, soybean meal was replaced with defatted DRS, which comprised 14% of the total diet. The selenized DRS application resulted in ~3-fold increase of Se content in the diet. Diet C was also fortified with the addition of vitamin E, increasing the natural content by 30%. The Se content of the blood and kidneys tended to increase in the DRS groups, where the changes were significant (P < 0.05) only in the case of SHR rats. The iodine (I) content and the proportion of iodide in rat livers indicated a lower transformation rate of iodide into organoiodine compounds compared to the control. Slight and ambiguous alterations in the antioxidative response of the rat were observed in the DRS groups, but the addition of vitamin E to the diet helped to moderate these effects.

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Comparing the Nitrogen and Potassium Requirements of Canola and Wheat for Yield and Grain Quality

Cited by 43 publications

References 29 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.)

Potassium‐fertilizer management in winter oilseed‐rape production in China

The Response of Macro- and Micronutrient Nutrient Status and Biochemical Processes in Rats Fed on a Diet with Selenium-Enriched Defatted Rapeseed and/or Vitamin E Supplementation

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