| Effects of nitrogen fertilization time on photosynthetic characteristics and yield components of land cotton |
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| DOI：10.7606/j.issn.1000-7601.2013.04.033 |
| Key Words: land cotton nitrogen fertilization time photosynthetic characteristics yield |
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| Abstract: |
| The effect of fertilization time on photosynthetic characteristics and yield components of land cotton in 2011 was studied in this paper, under the condition that the total annual nitrogen fertilizer usage was fixed. The results showed that: in N3 treatment, 150 kg·hm-2 of nitrogen fertilizer was applied before planting as base fertilizer and at flower and boll stage as boost, the SPAD value and net photosynthetic rate were high after the flower and boll stage. In N4 treatment, 150 kg·hm-2 of nitrogen fertilizer was applied at budding stage and the flower and boll stage. In N4 treatment, the tested cotton had highest leaf area index, followed by the N3 treatment. N3 treatment also inhibited the abscission of the bud and boll of cotton. The bud a
nd boll abscission rate in N3 treatment was 48.98% and 44.44% lower than in N2 and N4 treatment respectively. The N3 treatment achieved the highest Lint Yield and reached the maximum of 1 324.7 kg·hm-2, which was 14.9% higher than the average lint yield of tested cottons in all treatments. |
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