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- Title
施氮量对等行距密植棉花气体交换和叶绿素荧光特性的影响.
- Authors
田雨; 王旭文; 韩焕勇; 罗宏海; 王方永
- Abstract
To clarify the regulation mechanism of photosynthetic characteristics and yield of cotton under wide-row spacing with high-density conditions in the hope of providing theoretical basis and practical guidance for the management of high-efficiency nitrogen fertilizer.【Methods】 By taking the early-maturing cotton cultivar Xinluzao 64 as the test variety, this paper measured the gas exchange parameters, chlorophyll fluorescence parameters, yield and yield components of cotton at the yield formation stage under 5 different treatments, namely nitrogen application rates of N0 (kg/667 m²), N8 (8 kg/667 m²), N16 (16 kg/667 m²), N24 (24 kg/667 m²) and N32 (32 kg/667 m²).【Results】 There was no significant difference in the single boll weight under various nitrogen application rates; the total number of bolls and yield treated by N16 and N24 were relatively high, while those by N0 and N8 treatments were the lowest. From the full-bloom stage to the later stage of boll development, the net photosynthetic rates of cotton treated by N16, N24 and N32 were always at a high level. The transpiration rates and stomatal conductance of N16 and N24 treatments at the boll development stage were much lower than those of N32 treatment were, yet their intercellular CO2 concentrations were significantly higher than that of N32 treatment. From the full-bloom stage to the boll development stage, no significant difference was observed in the maximum photochemical efficiencies of various nitrogen application treatments except that the maximum photochemical efficiencies of N0 and N8 treatments were significantly lower than those of other treatments at the later stage of boll development; the actual photochemical efficiencies and photochemical quenching coefficients of N16 and N24 treatments were high in the later stage of boll development. Furthermore, the non-photochemical quenching coefficient of N16 treatment was significantly lower than those of N24 and N32 treatments.【Conclusion】 Under wide-row spacing with high-density conditions, a nitrogen application rate of 16-24 kg/667 m² contributes to the high photosynthetic capacity of leaves at the flowering and boll setting stages of cotton, as well as the best utilization of light energy by leaves in the later stage of boll development, thereby greatly raising the yield of cotton.
- Publication
Xinjiang Agricultural Sciences, 2020, Vol 57, Issue 11, p1987
- ISSN
1001-4330
- Publication type
Article
- DOI
10.6048/j.issn.1001-4330.2020.11.004