Abstract
In Poland nearly 40% of land under agricultural use is characterised by a progressing deficit of copper available to plants. Inventory studies revealed that 25% of rapeseed plantations are undernourished with this component. The objective of the study was to estimate the yield-forming effects of foliar and soil fertilisation of rapeseed with copper, to identify the optimum dose of Cu for the crop species, and to compare the effects of the two methods of application on the quality of the seeds. The study comprised two three-year strict field experiments, in which pre-sowing fertilisation of rapeseed with copper was applied at rates of 4, 8 and 12 kg Cu⋅ha-1, as well as foliar spraying at the optimum dose of 250 Cu g⋅ha-1 in the phase of closed bud. The experiments were set up on light soils of acid and light acid reaction and with a low or medium content of available copper. Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying. In plants from treatments without copper fertilisation, insufficient levels of the content of this component were found. Sufficient copper nutrition of plants caused a significant increase in yields of rape seeds. In some of the treatments, there was a tendency for the copper content in seeds to increase favourably, especially in the case of foliar application and of the higher copper doses applied to the soil. Also, some cases of increased oil content in seeds were recorded, even by several percent compared to seeds from treatments without Cu fertilisation. With the existing copper deficit in soils in Poland, fertilisation of rapeseed with this component appears to be crucial.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Soil copper fertilisation at 8 and 12 kg Cu per ha significantly increased rapeseed yield relative to the no-copper control.
Verbatim
e0“Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying”
Claim · model-written summary
Foliar copper spraying at 250 g Cu per ha significantly increased rapeseed yield relative to the no-copper control.
Verbatim
e0“Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying”
e1“as well as foliar spraying at the optimum dose of 250 Cu g⋅ha-1 in the phase of closed bud”
Claim · model-written summary
Copper application tended to increase copper content in rapeseed seeds, especially with foliar application.
Verbatim
e0“Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying”
e2“there was a tendency for the copper content in seeds to increase favourably, especially in the case of foliar application and of the higher copper doses applied to the soil”
Claim · model-written summary
Copper fertilisation increased seed oil content in some cases, by several percent relative to untreated plots.
Verbatim
e0“Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying”
e3“some cases of increased oil content in seeds were recorded, even by several percent compared to seeds from treatments without Cu fertilisation”
Claim · model-written summary
Plants from treatments without copper fertilisation had insufficient copper content.
Verbatim
e0“Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying”
e4“In plants from treatments without copper fertilisation, insufficient levels of the content of this component were found”
Claim · model-written summary
Fertilisation of rapeseed with copper appears crucial given the copper deficit in Polish soils.
Verbatim
e0“Significant increases in rapeseed yields, compared to the control treatment (without Cu), were obtained in treatments fertilised to the soil with doses of 8 and 12 kg Cu⋅ha -1 and in the treatment with foliar spraying”
e5“fertilisation of rapeseed with this component appears to be crucial”
The same questions in other papers
copper atom · yield · Brassica napus (oilseed rape)Results differ
5 papers in the same direction as this paper · 3 in the opposite direction
- positive
- no effect
- negative
5 papers more in this group
See all 9 papers →copper atom · quality: oil · Brassica napus (oilseed rape)Results agree
2 papers in the same direction as this paper
- positive
- positive
fertilization · quality: oil · Brassica napus (oilseed rape)Results differ
41 papers in the same direction as this paper · 20 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
59 papers more in this group
See all 63 papers →application · yield · Brassica napus (oilseed rape)Positive and negative results
84 papers in the same direction as this paper · 8 in the opposite direction
- negative
- negative
- no effect
89 papers more in this group
See all 93 papers →fertilization · yield · Brassica napus (oilseed rape)Positive and negative results
336 papers in the same direction as this paper · 37 in the opposite direction · 4 reporting no difference from an alternative
- positive
- negative
- no effect
374 papers more in this group
See all 378 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.