Abstract
Abstract Increasing planting density is a common practice to enhance rapeseed ( Brassica napus L.) yield via an increase in pod quantity. However, excessive density may lead to a deterioration in pod quality. Therefore, we hypothesized that improving pod quality based on a certain level of pod quantity could further increase seed yield. A randomized block experiment was conducted with five density levels (2.4, 3.6, 4.8, 6.0, and 7.2 × 10 5 plants ha −1 , referred to as D1, D2, D3, D4, and D5) using two hybrid varieties of Qinyou10 and Ningza1838. The plot seed yield reached the maximum value in D2 or D3, and there was no significant difference between these two density levels. An increase in planting density resulted in a decrease in canopy thickness, but an increase in lodging angle and pod density. According to the number of seeds per pod, the pods were categorized into low‐productive pod (≤14), middle‐productive pod (15‒17), and high‐productive pod (≥18). The number of high‐productive pod in D2 and D3 ranged from 48.15 × 10 6 to 54.22 × 10 6 ha −1 , accounting for 53.76%‒63.28% of the total pod number and 76.89%‒82.83% of the total seed yield. With the planting density increasing from D3 to D5, there was a significant transition from high‐productive pod to middle‐productive and low‐productive pods, causing a decrease in seed yield. Therefore, when the seed yield was targeted as 4500 kg ha −1 , the suitable planting density ranged from 3.6 × 10 5 to 4.8 × 10 5 plants ha −1 , and the optimal number of pods in population ranged from 83.0 × 10 6 to 94.0 × 10 6 ha −1 , and the quantity proportion of high‐productive pod maintained >50%. This study provides a guide for high‐yield cultivation of rapeseed in China and presents a novel approach to promoting a potential yield of rapeseed.
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 13
Claim · model-written summary
Plot seed yield peaked at D2 or D3.
Verbatim
e0“The plot seed yield reached the maximum value in D2 or D3, and there was no significant difference between these two density levels.”
t0“rapeseed”
Claim · model-written summary
Plot seed yield did not significantly differ between D2 and D3.
Verbatim
e0“The plot seed yield reached the maximum value in D2 or D3, and there was no significant difference between these two density levels.”
t0“rapeseed”
Claim · model-written summary
Higher planting density changed canopy thickness in the stated direction.
Verbatim
e0“An increase in planting density resulted in a decrease in canopy thickness, but an increase in lodging angle and pod density.”
t0“rapeseed”
Claim · model-written summary
Higher planting density changed lodging angle in the stated direction.
Verbatim
e0“An increase in planting density resulted in a decrease in canopy thickness, but an increase in lodging angle and pod density.”
t0“rapeseed”
Claim · model-written summary
Higher planting density changed pod density in the stated direction.
Verbatim
e0“An increase in planting density resulted in a decrease in canopy thickness, but an increase in lodging angle and pod density.”
t0“rapeseed”
Claim · model-written summary
At D2 and D3, high productive pods accounted for 48.15 × 10 6 to 54.22 × 10 6 ha −1 of number of high‐productive pod.
Verbatim
e0“The number of high‐productive pod in D2 and D3 ranged from 48.15 × 10 6 to 54.22 × 10 6 ha −1 , accounting for 53.76%‒63.28% of the total pod number and 76.89%‒82.83% of the total seed yield.”
t0“rapeseed”
Claim · model-written summary
At D2 and D3, high productive pods accounted for 53.76%‒63.28% of total pod number.
Verbatim
e0“The number of high‐productive pod in D2 and D3 ranged from 48.15 × 10 6 to 54.22 × 10 6 ha −1 , accounting for 53.76%‒63.28% of the total pod number and 76.89%‒82.83% of the total seed yield.”
t0“rapeseed”
Claim · model-written summary
At D2 and D3, high productive pods accounted for 76.89%‒82.83% of total seed yield.
Verbatim
e0“The number of high‐productive pod in D2 and D3 ranged from 48.15 × 10 6 to 54.22 × 10 6 ha −1 , accounting for 53.76%‒63.28% of the total pod number and 76.89%‒82.83% of the total seed yield.”
t0“rapeseed”
Claim · model-written summary
Increasing density from D3 to D5 shifted pods from high to middle and low productive classes.
Verbatim
e0“With the planting density increasing from D3 to D5, there was a significant transition from high‐productive pod to middle‐productive and low‐productive pods, causing a decrease in seed yield.”
t0“rapeseed”
Claim · model-written summary
The shift in pod classes with density from D3 to D5 decreased seed yield.
Verbatim
e0“With the planting density increasing from D3 to D5, there was a significant transition from high‐productive pod to middle‐productive and low‐productive pods, causing a decrease in seed yield.”
t0“rapeseed”
Claim · model-written summary
For a 4500 kg ha −1 yield target, authors recommend suitable planting density of 3.6 × 10 5 to 4.8 × 10 5 plants ha −1.
Verbatim
e0“Therefore, when the seed yield was targeted as 4500 kg ha −1 , the suitable planting density ranged from 3.6 × 10 5 to 4.8 × 10 5 plants ha −1 , and the optimal number of pods in population ranged from 83.0 × 10 6 to 94.0 × 10 6 ha −1 , and the quantity proportion of high‐productive pod maintained >50%.”
t0“rapeseed”
Claim · model-written summary
For a 4500 kg ha −1 yield target, authors recommend optimal number of pods in population of 83.0 × 10 6 to 94.0 × 10 6 ha −1.
Verbatim
e0“Therefore, when the seed yield was targeted as 4500 kg ha −1 , the suitable planting density ranged from 3.6 × 10 5 to 4.8 × 10 5 plants ha −1 , and the optimal number of pods in population ranged from 83.0 × 10 6 to 94.0 × 10 6 ha −1 , and the quantity proportion of high‐productive pod maintained >50%.”
t0“rapeseed”
Claim · model-written summary
For a 4500 kg ha −1 yield target, authors recommend quantity proportion of high‐productive pod of >50%.
Verbatim
e0“Therefore, when the seed yield was targeted as 4500 kg ha −1 , the suitable planting density ranged from 3.6 × 10 5 to 4.8 × 10 5 plants ha −1 , and the optimal number of pods in population ranged from 83.0 × 10 6 to 94.0 × 10 6 ha −1 , and the quantity proportion of high‐productive pod maintained >50%.”
t0“rapeseed”