Relationship between Phosphorus and Nitrogen Concentrations of Flax

文献类型： 外文期刊

第一作者： Xie, Yaping

作者： Xie, Yaping;Wang, Limin;Zhang, Jianping;Dang, Zhao;Li, Wenjuan;Qi, Yanni;Zhao, Wei;Dong, Kongjun;Wang, Xingrong;Zhang, Yanjun;Wang, Xingzhen;Xie, Yaping;Li, Lingling;Zhou, Yangchen;Li, Lingling;Zeng, Xiucun;Shi, Linrong;Wu, Gang

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关键词： nitrogen; phosphorus; shoot biomass; N; P ratio

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

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年卷期： 2023 年 13 卷 3 期

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收录情况： SCI

摘要： Tools quantifying phosphorus (P) status in plants help to achieve efficient management and to optimize crop yield. The objectives of this study were to establish the relationship between P and nitrogen (N) concentrations of flax (Linum usitatissimum L.) during the growth season to determine the critical P concentration for diagnosing P deficiency. Field experiments were arranged as split plots based on a randomized complete block design. Phosphorus levels (0, 40, 80, 120, and 160 kgP(2)O(5) ha(-1)) were assigned to the main plots, and cultivars (Dingya 22, Lunxuan 2, Longyaza 1, Zhangya 2, and Longya 14) were allocated to the subplots. Shoot biomass (SB) and P and N concentrations were determined at 47, 65, 74, 98, and 115 days after emergence. Shoot biomass increased, while P and N concentrations and the N:P ratio declined with time in each year. The P concentration in respect of N concentration was described using a liner relationship (P = 0.05, N + 1.68, R-2 = 0.76, p < 0.01) under non-limiting P conditions, in which the concentrations are expressed in g kg(-1) dry matter (DM). The N:P ratio was fitted to a second-order polynomial equation (N:P = 11.56 x SB-0.1, R-2 = 0.71, p = 0.03), based on the SB of flax. This research first developed a predictive model for critical P concentration in flax, as a function of N concentration in shoots of flax. The critical P concentration can be used as a promising alternative tool to quantify the degree of P deficiency of flax during the current growing season.

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