| This article has been：Browse 16Times Download 23Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2025058 |
|
| The effects of irrigation with mildly polluted river water on soil salinity and rice growth in paddy field |
|
LIU Zhigang, WANG Yanyu, GONG Wenjuan, LIAN Siying, CHEN Lina
|
|
1. Anhui Urban Construction Design Research General Institute Co., Ltd., Hefei 230051, China;
2. Hohai University, Nanjing 210024, China
|
| Abstract: |
| 【Background and Objective】With urban expansion and population growth, the Nanfei River has degraded into a sewage channel, giving rise to serious water environmental concerns. Farmland along the river, mainly producing vegetables and cereals, relies on water in the river for irrigation, yet long-term effects of this practice on soil health and crop quality remain unclear. This paper aimed to bridge this gap, evaluating the effects of different irrigation practices and their management on soil salinity, growth and yield of paddy rice, and identifying sustainable irrigation methods that conserve water while maintaining sustainable crop productivity.【Method】The experiment was conducted from June to October 2022 using rice-planted pots in a greenhouse at the Jiangning Water Conservation Park (Hohai University). There were three irrigation-water type treatments: clean water irrigation (Q), irrigation with the slightly polluted river water (W), and irrigation alternately using clean and the polluted water (QW). For each water-type irrigation treatment, there were a flooding irrigation method (Y) and a controlled irrigation method (K). During the experiment, soil salinity, growth traits and yield components of rice were measured in each treatment.【Result】① Compared with flooding irrigation with clean water, irrigation with river water significantly increased electrical conductivity and Cl- content in soil water, with effects more significant under continuous irrigation with river water than alternately using it. After the tillering stage, SO42- content in the soil under controlled irrigation associated with the treatments of W, QW and Q was 33%-433%(S35) higher than that in irrigation with clean water (p＜0.05). ② On average, flooding irrigation reduced plant height and leaf area index, but increased tiller numbers and grain yield, compared to controlled irrigation. Compared with irrigation with clean water, irrigation continuously using river water reduced the rice yield by 2.7%-5.3%, and alternating clean water and river water in irrigation increased the effective panicles of rice by 4.8%-35.0%, the number of well-filled grains by 11.3%-68.1%, and grain yield by 3.5%-67.3%.【Conclusion】Alternating clean and river water in irrigation can alleviate freshwater shortages, reduce soil salt accumulation, and improve rice yield. It offers a sustainable irrigation strategy for water-saving in rice cultivation in the study region. |
| Key words: micro-polluted river water; rotational irrigation; salt; rice yield |
|
|
