Abstract
BackgroundAn optimal N rate is one of the basic determinants for high cotton yield. The purpose of this study was to determine the optimal N rate on a new cotton cropping pattern with late-sowing, high density and one-time fertilization at the first flower period in Yangtze River Valley, China. A 2-year experiment was conducted in 2015 and 2016 with a randomized complete block design. The cotton growth process, yield, and biomass accumulation were examined.ResultsThe results showed that N rates had no effect on cotton growing progress or periods. Cotton yield was increased with N rates increasing from 120 to 180 kg·hm−2, while the yield was not increased when the N rate was beyond 180 kg·hm−2, or even decreased (9∼29%). Cotton had the highest biomass at the N rate of 180 kg·hm−2 is due to its highest accumulation speed during the fast accumulation period.ConclusionsThe result suggests that the N rate for cotton could be reduced further to be 180 kg·hm− 2 under the new cropping pattern in the Yangtze River Valley, China.
Highlights
An optimal N rate is one of the basic determinants for high cotton yield
N is a vital nutrient for cotton, and an optimal N rate is conducive to cotton growth for different growing patterns (Rochester et al 2007)
Cotton growth period N rate had no effect on cotton growth periods in both years (Table 1)
Summary
An optimal N rate is one of the basic determinants for high cotton yield. The purpose of this study was to determine the optimal N rate on a new cotton cropping pattern with late-sowing, high density and onetime fertilization at the first flower period in Yangtze River Valley, China. The cotton growth process, yield, and biomass accumulation were examined. N is a vital nutrient for cotton, and an optimal N rate is conducive to cotton growth for different growing patterns (Rochester et al 2007). The highest cotton yield was achieved under the optimal N rate (Stamatiadis et al 2016). The highest yield was observed closely associated with higher biomass and its accumulation speed during FAP, especially for reproductive organs (Xue et al 2008). The highest yield was observed closely associated with higher biomass and its accumulation speed during FAP, especially for reproductive organs (Xue et al 2008). Read et al (2006) reported that the cotton vegetative growth could be coordinated with its reproductive growth with an appropriate N rate
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