Denser planting plus later pruning boosts cotton yields
Crop Improvement
If you've ever pinched back a tomato or pepper plant to control its shape, this shows that timing that pinch later, combined with tighter spacing, can push a plant to build more leaf area and pack more sugar into its fruit before it starts to fade.
Scientists tested a compact cotton plant with short side branches, growing it at two different spacing levels and pinching off its growing tip either early or late in the season. The combination of tighter spacing and later pinching gave the plant more leaves to catch sunlight, kept those leaves working longer without aging out, and packed more sugar into the cotton bolls, ultimately producing the highest yield.
Key Findings
The high-density plus late-topping combination increased lint and seed cotton yields by boosting biological yield and boll density compared to the other three treatment combinations.
Leaf area index rose 46.30% to 78.52% and reproductive biomass per ground area rose 6.77% to 40.18% under high density with late topping, compared with other treatments.
Late topping increased activity of two key sugar-building enzymes (ADP-glucose pyrophosphorylase and sucrose phosphate synthase), raising leaf starch and total carbohydrate levels, with low-density late-topping plants showing the highest carbohydrate concentrations overall.
chevron_right Technical Summary
Chinese researchers found that planting a special short-branch cotton variety more densely and delaying its 'topping' (pinching off the growing tip) boosts yield by helping the plant build more leaf area and funnel more sugar into developing bolls before leaves start to decline.
Abstract Preview
Original paper
Effects of planting density and topping time on the source-sink tributes and photosynthetic carbon production in short-fruiting branch cotton
Abstract Background Short fruiting branch cotton (SFBC) has normal main-stem growth. However, the growth of fruiting branches is compromised by a short sympodial internode of 2–5 cm, which is suita...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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