Effect of Phosphorus Fertilizer Placement Depth, Amount, and Soil Water Content on Early Maize Growth

文献类型： 外文期刊

第一作者： Ning, Fangfang

作者： Ning, Fangfang;Munz, Sebastian;Graeff-Hoenninger, Simone;Nkebiwe, Peteh Mehdi;Hartung, Jens;Zhang, Ping;Huang, Shoubing

作者机构：

关键词： Drought stress; Early growth stages; Fertilizer application; P deficiency; Root development

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.8； 五年影响因子：2.8 ）

ISSN： 1436-8730

年卷期： 2025 年

页码：

收录情况： SCI

摘要： BackgroundDrought stress (DS) reduces soil phosphorus (P) availability by limiting P diffusion and uptake, while global P resource scarcity exacerbates nutrient limitations for crops.AimThis study investigated whether deep subsurface P placement could alleviate the combined effects of P deficiency and DS on maize growth.MethodsA greenhouse trial with maize (cv. Ricardinio) was conducted involving three factors: three P fertilizer amounts (0 mg P pot-1 [NP], 109 mg P pot-1 [LP], and 655 mg P pot-1 [HP]), three placement depths (0-9 cm [U, upper layer], 9-18 cm [L, lower layer], and uniformly mixed throughout 0-18 cm [M]), and two soil water contents (45% of soil water holding capacity [WHC] [DS] and 75% WHC [WW]). Root and shoot traits were assessed at the fourth- and tenth-leaf stages.ResultsLP significantly reduced shoot biomass and P content compared to HP treatment. At the fourth-leaf stage, DS increased root biomass by 69.3% and 27.1% in the 9-18 cm and 0-18 cm layers compared to WW treatment. At the tenth-leaf stage, DS reduced root biomass by at least 41% across layers and decreased shoot growth and P uptake. Under DS, L-DS increased root growth and root length in the 9-18 cm layer compared to M-DS and U-DS treatments but did not improve shoot traits.ConclusionDeep subsurface P placement promoted deeper root development under drought and P deficiency. However, its benefits on shoot growth were not evident in early stages, indicating the need for longer term field validation.

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