Accumulation characteristics of biomass and nitrogen and critical nitrogen concentration dilution model of cotton reproductive organ |
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Authors: | Xue Xiaoping Sha Yizhuo Guo Wenqi and Zhou Zhiguo |
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Institution: | 1. Key Laboratory of Crop Growth Regulation of the Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China;2. Shandong Provincial Climatic Center, Jinan 250031, China;3. Atmospheric Observation Technology Center, Beijing 100081, China |
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Abstract: | Several nitrogen (N) field experiments were carried out in Nanjing and Anyang, China, to study the dynamic characteristics of biomass accumulation and N uptake, and to define the dilution curve for critical N concentration in cotton reproductive organ over the growth period. The results show that the total biomass and N accumulation were affected significantly by the rate of N application, exhibiting a sigmoid curve over time. The beginning time of fast N accumulation was 1–5 d earlier than that of biomass accumulation. The cotton lint yield was correlated with N concentration in the reproductive organ and fluctuated with varying N concentration, indicating the existence of luxurious N consumption in the cotton reproductive organ. The N concentration increased with increasing N application rates, and decreased gradually during the growth period. The relationship between biomass and N concentration can be described with a power equation. The patterns of the N concentration dilution model were consistent at both experimental sites, but the model parameter values of a differed. The results presented in this paper indicate that a critical N concentration dilution curve for cotton reproductive organ is independent of ecological region and can be described with a power equation. |
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Keywords: | cotton cotton reproductive organ biomass nitrogen accumulation critical nitrogen concentration nitrogen dilution model |
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