Journal
SAUDI JOURNAL OF BIOLOGICAL SCIENCES
Volume 28, Issue 6, Pages 3578-3584Publisher
ELSEVIER
DOI: 10.1016/j.sjbs.2021.03.034
Keywords
Cotton; Development; Nitrogen utilization efficiency; Plant density
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Funding
- National Natural Science Foundation of China [31271665]
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The study focused on the interactive effects of nitrogen fertilizer and plant densities on cotton growth and yield. Results showed variations in plant biomass production, photosynthetic rate, and nitrogen contents at different stages of development, with the squaring stage being the most critical.
Individual effects of application of nitrogen (N) and plant densities (PD) were reported in various studies; however an interactive effect of N and PD in cotton was not studied. To explore the benefits of interactive effects of N fertilizer and PD to increase the quality of cotton. This study was carried out in randomized complete block design (RCBD) with split plot arrangement. In split plot arrangement, main plot was consisted of N application rate and in sub plots different PD were done. There were two nitrogen levels; low N level (F1) 120 kg ha(-1) and high N level (F2) 180 kg ha(-1) and three planting densities; 8 plants m(-2) as low density (LD), 10 plants m(-2) as medium density (MD) and 12 plants m(-2) as high density (HD). In this study we observed the interactive effect of N application levels and PD on cotton photosynthetic and agronomic traits of various stages of development. Results showed that cotton growth and N contents was varied among treatments on different development stages. Plant biomass production, photosynthetic rate (Pn), intercellular CO2 (C-i), water use efficiency (WUE) and N contents were unaffected at the seedling stage by N application rate and PD, however, the highest Pn, C-i and N contents was at squaring stage followed by blooming stage. Higher seed cotton yield and lint yield were obtained F1 with HD, and F2 with MD yielded the highest N contents and cotton yield among treatments. We found that the squaring stage was more critical, followed by the blooming stage when considering N rate and PD. (C) 2021 Published by Elsevier B.V. on behalf of King Saud University.
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