Optimizing nitrogen application rate and plant density for improving cotton yield and nitrogen use efficiency in the North China Plain - Fig 1

<p>Leaf area index(LAI) of cotton at different growth periods in 2013(A) and 2014(B)Note: D1, D2, D3 indicate planting density at 3.00, 5.25, 7.50 plants m⁻² respectively, and N0, N1, N2, N3, N4 indicate nitrogen application rate at 0, 112.5, 225.0, 337.5 kg ha⁻¹ respectively. A, B indicate 2013 and 2014. Numbers at the same growth stage followed by the same small alphabet are not significantly different at the 5% level.</p

Seedcotton yield effect equation of PPD under different NAR treatments.

<p>Seedcotton yield effect equation of PPD under different NAR treatments.</p

Cotton growth period in 2013 and 2014.

<p>Cotton growth period in 2013 and 2014.</p

Monthly weather summary during the cotton growing season in 2013 and 2014 at Anyang, Henan, China.

<p>Monthly weather summary during the cotton growing season in 2013 and 2014 at Anyang, Henan, China.</p

Effects of PPD and NAR on biological, economic (seedcotton and lint) yield and harvest index in 2013 and 2014.

<p>Effects of PPD and NAR on biological, economic (seedcotton and lint) yield and harvest index in 2013 and 2014.</p