Nitrogen Fertilization Temporarily Enhances Phosphatase Activity in a High-P Loamy Sand

IF 3.3 3区农林科学 Q1 AGRONOMY

Journal of Plant Nutrition and Soil Science Pub Date : 2026-10-01 Epub Date: 2026-07-29 DOI:10.1002/jpln.70104

Ingeborg F. Pedersen, Martin S. A. Blackwell, Nelly Sophie Raymond, Jørgen Eriksen

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引用次数: 0

Abstract

Background

Efficient plant utilization of soil phosphorus (P) is essential to reduce dependence on mineral P fertilizers in intensive agriculture. Input of mineral nitrogen (N) fertilizers and its chemical form may influence the activity of P mineralizing enzymes, but how this interaction operates under field conditions in a soil with high P status remains poorly understood.

Aims

This study investigated how different mineral N fertilizer forms influence soil pH and phosphomonoesterase activity during early maize growth, using these parameters as proxies for potential mineralization of organic soil P.

Methods

A one-season lysimeter study was conducted with maize (Zea mays L.) grown on a loamy sand soil with high Olsen-P content. Nitrogen was applied at a rate of 180 kg N ha⁻¹ as either nitrate-N or ammonium-N. A treatment without N was included as a reference. Soil pH and phosphomonoesterase activity were measured in bulk and rhizosphere soil at leaf stages V4, V5 and V6. At silage maturity, dry matter yield and P uptake were determined.

Results

Nitrogen fertilization increased maize yield by 68%, with similar yields observed for both N forms (25.5–26.0 Mg DM ha⁻¹). Rhizosphere pH was consistently higher than bulk soil pH across treatments. At V4, phosphomonoesterase activity was higher in the rhizosphere than in bulk soil in N-fertilized treatments.

Conclusion

Nitrogen fertilization momentarily stimulated rhizosphere phosphomonoesterase activity at an early growth stage, indicating altered conditions associated with organic P mineralization. Direct measurements of soil P pools are required to determine whether these changes translate into increased P availability under field conditions.

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施氮暂时提高高磷壤土中磷酸酶活性

背景在集约化农业中，植物有效利用土壤磷素是减少对矿质磷肥依赖的关键。矿质氮肥的输入及其化学形态可能影响磷矿化酶的活性，但在高磷土壤的田间条件下，这种相互作用如何运作仍不清楚。目的研究不同矿质氮肥形态对玉米生长早期土壤pH和磷单酯酶活性的影响，并以此作为有机土壤磷矿化潜力的指标。方法以玉米（Zea mays L.）在高奥尔森-磷含量的壤土上进行一季溶渗试验。施氮量为180 kg N ha - 1，分别为硝态氮和铵态氮。不含氮的处理作为参考。测定了叶期V4、V5和V6根际土壤和块状土壤pH和磷酸单酯酶活性。青贮成熟期测定干物质产量和磷吸收量。结果施氮可使玉米产量提高68%，两种施氮方式（25.5 ~ 26.0 Mg DM ha−1）产量相近。不同处理的根际pH值均高于体土pH值。在V4时，施氮处理根际磷单酯酶活性高于散装土。结论氮肥在生长早期瞬间刺激了根际磷单酯酶活性，表明有机磷矿化的相关条件发生了改变。需要对土壤磷库进行直接测量，以确定这些变化是否转化为田间条件下磷有效性的增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Plant Nutrition and Soil Science 农林科学-农艺学

CiteScore

4.70

自引率

8.00%

发文量

审稿时长

8-16 weeks

期刊介绍： Established in 1922, the Journal of Plant Nutrition and Soil Science (JPNSS) is an international peer-reviewed journal devoted to cover the entire spectrum of plant nutrition and soil science from different scale units, e.g. agroecosystem to natural systems. With its wide scope and focus on soil-plant interactions, JPNSS is one of the leading journals on this topic. Articles in JPNSS include reviews, high-standard original papers, and short communications and represent challenging research of international significance. The Journal of Plant Nutrition and Soil Science is one of the world’s oldest journals. You can trust in a peer-reviewed journal that has been established in the plant and soil science community for almost 100 years. Journal of Plant Nutrition and Soil Science (ISSN 1436-8730) is published in six volumes per year, by the German Societies of Plant Nutrition (DGP) and Soil Science (DBG). Furthermore, the Journal of Plant Nutrition and Soil Science (JPNSS) is a Cooperating Journal of the International Union of Soil Science (IUSS). The journal is produced by Wiley-VCH. Topical Divisions of the Journal of Plant Nutrition and Soil Science that are receiving increasing attention are: JPNSS – Topical Divisions Special timely focus in interdisciplinarity: - sustainability & critical zone science. Soil-Plant Interactions: - rhizosphere science & soil ecology - pollutant cycling & plant-soil protection - land use & climate change. Soil Science: - soil chemistry & soil physics - soil biology & biogeochemistry - soil genesis & mineralogy. Plant Nutrition: - plant nutritional physiology - nutrient dynamics & soil fertility - ecophysiological aspects of plant nutrition.