Effects of Nitrogen Supply Level on Nitrogen Absorption and Distribution and Nitrogen Efficiency of Different Cotton Varieties under Hydroponic Condition

doi:10.6048/j.issn.1001-4330.2022.06.010

Abstract

Abstract:

【Objective】 To explore the nitrogen absorption and distribution and nitrogen efficiency in the early growth period of cotton which might be helpful to the distribution of basic and topdressing nitrogen fertilizer and the improvement of nitrogen utilization rate in cotton production.【Methods】 Xinluzao 45 and Xinluzao 48 were used as materials and cultured in nutrient solution, treatments consisted of six N levels in nutrient solution(0, 7.5, 10, 15, 17.5 and 30 mmol/L, represented by N₀, N_7.5, N₁₀, N₁₅, N_17.5and N₃₀ respectively), plants were harvested after 43 days of growth in nutrient solution.After that, the dry matter accumulation, nitrogen concentration, accumulation and absorption efficiency, nitrogen use efficiency and phosphorus and potassium accumulation of cotton organs were measured.【Results】 The dry matter accumulation, whole plant nitrogen concentration, accumulation, shoot nitrogen concentration nitrogen absorption efficiency, phosphorus and potassium accumulation of cotton seedlings increased first and then decreased with the increase of nitrogen concentration; the root shoot ratio and nitrogen use efficiency decreased with the increase of nitrogen concentration.Nitrogen level at 17.5 mmol/L significantly increased the dry matter mass of roots and shoots, but the root shoot ratio of cotton was reduced.17.5 mmol/L of nitrogen significantly increased the nitrogen concentration, accumulation and absorption efficiency of cotton, as well as the accumulation of phosphorus and potassium, but decreased the utilization efficiency of nitrogen.The indexes of Xinluzao 48 were significantly higher than that of Xinluzao 45.【Conclusion】 The nitrogen concentration in the nutrient solution which is most helpful for the growth of cotton seedling is 17.5 mmol/L.Xinluzao 48 of type Ⅰ fruit branch grows stronger than Xinluzao 45 of type Ⅱ fruit branch.

Key words: cotton; nitrogen concentration; nitrogen accumulation; nitrogen use efficiency

摘要：

【目的】 分析棉花生育前期氮素吸收分配与氮效率将有助于棉花生产中氮肥基施和追施的分配以及氮肥利用率的提高。【方法】 以新陆早45号和新陆早48号为材料,采用营养液培养的方法,设置6个供氮水平(0、7.5、10、15、17.5、30 mmol/L,分别以N₀、N_7.5、N₁₀、N₁₅、N_17.5、N₃₀表示),培育43 d后将其收获。测定棉花各器官干物质量、氮素积累量、氮吸收效率、氮利用效率以及磷素和钾素积累量等指标。【结果】 棉花幼苗各干物质量、单株氮含量、地上部分氮含量、氮积累量、氮吸收效率以及磷素和钾素积累量均随氮浓度的增加呈先升高后降低的趋势;根冠比和氮利用效率均随氮浓度的增加而降低。氮水平在17.5 mmol/L时显著增加了根和地上部干物质量,但降低了棉花根冠比。17.5 mmol/L的氮水平显著提高了棉花地上部分氮含量、单株氮含量、积累量和吸收效率以及磷和钾积累量,但降低了氮的利用效率。新陆早48号各测定指标显著高于新陆早45号。【结论】 营养液中有助于棉苗各生长指标增长的氮素浓度为17.5 mmol/L。适合机采的Ⅰ式果枝新陆早48号较不适合机采的Ⅱ式果枝新陆早45号长势更强。

关键词: 棉花, 氮素浓度, 氮积累量, 氮利用效率

CLC Number:

S14
S562

LIANG Yue, QI Furong, SONG Haiying, CHEN Bolang, LIU Meijuan, TANG Xuexia, HOU Tianyu. Effects of Nitrogen Supply Level on Nitrogen Absorption and Distribution and Nitrogen Efficiency of Different Cotton Varieties under Hydroponic Condition[J]. Xinjiang Agricultural Sciences, 2022, 59(6): 1392-1400.

梁悦, 齐芙蓉, 宋海英, 陈波浪, 刘美娟, 唐雪霞, 侯天钰. 水培条件下供氮水平对不同棉花品种氮吸收分配与氮效率的影响[J]. 新疆农业科学, 2022, 59(6): 1392-1400.

Figures/Tables 4

Fig.1 Effect of nitrogen supply level on dry matter quality of different cotton cultivars Note:N-Nitrogen;C- Cultivars; N×C-Interaction between nitrogen treatment and Cultivars;Sig denote significant difference; Ns denote no significant difference; 0.01<P<0.05*,0.001<P<0.01** and P<0.001***。The same as below

Fig.2 Effects of nitrogen supply level on nitrogen content, nitrogen accumulation, nitrogen uptake efficiency and nitrogen use efficiency of different cotton cultivars

Fig.3 Effect of nitrogen supply level on nitrogen translocation efficiency of different cotton cultivars

Fig.4 Effects of nitrogen supply level on phosphorus and potassium accumulation of different cotton cultivars

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