Influence of Irrigation and Water Use on Agronomic Traits of Crops—2nd Edition

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Water Use and Irrigation".

Deadline for manuscript submissions: 30 April 2025 | Viewed by 267

Special Issue Editors


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Guest Editor
Key Laboratory of State Forestry Administration on Soil and Water Conservation, College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
Interests: water and fertilizer regulation in compound agroforestry system; water and salt regulation in saline-alkali land drip irrigation
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School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
Interests: crop and water; nitrogen and phosphorus migration; non-point source pollution control
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Research Center for Soil and Water Conservation and Ecological Environment, University of Chinese Academy of Sciences, Beijing 100083, China
Interests: water-saving irrigation; soil salinity management; soil-crop interaction; amelioration of low-quality crop lands
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Guest Editor
Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Interests: drip irrigation, Fertigation

Special Issue Information

Dear Colleagues,

Following the success of the first Special Issue on the “Influence of Irrigation and Water Use on Agronomic Traits of Crops” (https://www.mdpi.com/journal/agronomy/special_issues/Q34D6D2KI4) in Agronomy, the Editorial Office is pleased to launch a second edition of the Special Issue.

The shortage of water resources is the main factor restricting the sustainable development of agriculture. Irrigation measures can meet the huge gap between soil water supply and crop demand, effectively improving crop yield and land-use efficiency, so it is widely practiced in arid and semi-arid areas. There are complex interactions between crops and soil water. Crops adapt to different soil water conditions by changing the economic spectra of roots and leaves, matter allocation, and other agronomic traits to maintain a balance between survival and production. Understanding the effects of irrigation on crop agronomic traits is crucial for optimizing crop water management. However, due to the multi-dimensional complexity of irrigation effects on the aboveground and underground parts of crops, there are still some gaps in understanding the link between crop agronomic traits and the efficient use of irrigation water. We welcome any research that meets the objectives and scope of irrigation and crop agronomic traits. The themes can include, but are not limited to, the following: (1) exploring the adaptation strategies of crop agronomic traits to different irrigation levels; (2) exploring the relationship between crop agronomic traits and irrigation water efficient utilization; and (3) optimizing irrigation management strategies for crops.

Dr. Ruoshui Wang
Dr. Yuguo Han
Dr. Tibin Zhang
Dr. Qibiao Han
Guest Editors

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Keywords

  • irrigation
  • agronomic traits
  • adaptive strategy
  • water utilization

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Published Papers (1 paper)

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Research

19 pages, 5873 KiB  
Article
An Excessive K/Na Ratio in Soil Solutions Impairs the Seedling Establishment of Sunflower (Helianthus annuus L.) through Reducing the Leaf Mg Concentration and Photosynthesis
by Yu Cheng, Tibin Zhang, Weiqiang Gao, Yuxin Kuang, Qing Liang, Hao Feng and Saparov Galymzhan
Agronomy 2024, 14(10), 2301; https://doi.org/10.3390/agronomy14102301 (registering DOI) - 6 Oct 2024
Abstract
In saline conditions, establishing healthy seedlings is crucial for the productivity of sunflowers (Helianthus annuus L.). Excessive potassium (K+) from irrigation water or overfertilization, similar to sodium (Na+), could adversely affect sunflower growth. However, the effects of salt [...] Read more.
In saline conditions, establishing healthy seedlings is crucial for the productivity of sunflowers (Helianthus annuus L.). Excessive potassium (K+) from irrigation water or overfertilization, similar to sodium (Na+), could adversely affect sunflower growth. However, the effects of salt stress caused by varying K/Na ratios on the establishment of sunflower seedlings have not been widely studied. We conducted a pot experiment in a greenhouse, altering the K/Na ratio of a soil solution to grow sunflower seedlings. We tested three saline solutions with K/Na ratios of 0:1 (P0S1), 1:1 (P1S1), and 1:0 (P1S0) at a constant concentration of 4 dS m−1, along with a control (CK, no salt added), with five replicates. The solutions were applied to the pots via capillary rise through small holes at the bottom. The results indicate that different K/Na ratios significantly influenced ion-selective uptake and transport in crop organs. With an increasing K/Na ratio, the K+ concentration in the roots, stems, and leaves increased, while the Na+ concentration decreased in the roots and stems, with no significant differences in the leaves. Furthermore, an excessive K/Na ratio (P1S0) suppressed the absorption and transportation of Mg2+, significantly reducing the Mg2+ concentration in the stems and leaves. A lower leaf Mg2+ concentration reduced chlorophyll concentration, impairing photosynthetic performance. The lowest plant height, leaf area, dry matter, and shoot/root ratio were observed in P1S0, with reductions of 27%, 48%, 48%, and 13% compared to CK, respectively. Compared with CK, light use efficiency and CO2 use efficiency in P1S0 were significantly reduced by 13% and 10%, respectively, while water use efficiency was significantly increased by 9%. Additionally, improved crop morphological and photosynthetic performance was observed in P1S1 and P0S1 compared with P1S0. These findings underscore the critical role of optimizing ion composition in soil solutions, especially during the sensitive seedling stage, to enhance photosynthesis and ultimately to improve the plant’s establishment. We recommend that agricultural practices in saline regions incorporate tailored irrigation and fertilization strategies that prioritize optimal K/Na ratios to maximize crop performance and sustainability. Full article
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