Effect of Short-term Irrigation of Wastewater on Wheat Growth and Nitrogen and Phosphorus in Soil
- PDF / 619,719 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 32 Downloads / 266 Views
ORIGINAL PAPER
Effect of Short-term Irrigation of Wastewater on Wheat Growth and Nitrogen and Phosphorus in Soil Thi Huong Xuan Le 1,2 & Luke Mosley 3 & Dinh Thi Nguyen 2 & Petra Marschner 1 Received: 1 August 2019 / Accepted: 30 October 2019 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract Determine how plant age influences the effect of short-term wastewater irrigation on growth and nutrient uptake, soil available and N and P concentration. Sandy soil was left unplanted or planted with wheat and then watered with reverse osmosis (RO) water for 20 days. Wheat was planted so that plants were 7, 14 or 21 days old when half of the pots were irrigated with wastewater from days 20 to 35; the other pots received RO water until day 35. Similarly, unplanted pots received either RO or wastewater water from days 20 to 35. Irrigation with wastewater had little effect on plant dry weight, shoot N and P concentration or available N and P, and microbial biomass N and P in soil in both planted and unplanted treatments. Wastewater irrigation increased shoot N uptake compared with RO treatments only in plants that were 21 days old at the start of wastewater addition. Presence of plants reduced available nitrate up to 30-fold compared with unplanted soil. In this sandy soil, short-term wastewater irrigation had little effect on wheat growth, N and P uptake, and N and P concentration in soil. However, presence of plants reduced available N and P in soil compared with unplanted soils which would reduce potential of nutrient leaching after wastewater irrigation. Keywords Inorganic N . Inorganic P . Growth stages . Wastewater irrigation . Wheat
1 Introduction Wastewater derived from anthropogenic activities is an environmental concern worldwide (Bedessem et al. 2005; Gibert et al. 2008). Wastewater generated from domestic, industrial and commercial activities has increased with population and economic development (Qadir et al. 2010). Reuse of wastewater for irrigation of cropland is a common practice, especially in developing countries where technologies for wastewater treatment are limited (Castro et al. 2013) and in semiarid and arid zones where fresh water supply is scarce (Avnimelech et al. 1993; Jalali et al. 2008). According to the FAO, approximately 10% of the world’s irrigated land area receives partially treated or untreated wastewater (Cooper 2007). * Petra Marschner [email protected] 1
School of Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA 5005, Australia
2
Hue University of Agriculture and Forestry, Hue City, Vietnam
3
School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
Wastewater irrigation can change soil properties (Biswas et al. 2017). For example, it can reduce soil bulk density and increase soil water holding capacity, pH, EC, organic C, total N, available P and S and exchangeable cations (Na, K, Ca, Mg) compared with freshwater irrigation (Biswas et al. 2017). However, wastewater irrigation can also result in salt and metal acc
Data Loading...
