Assessment of organic amendments for improving coastal saline soil

Abstract

Salt-affected soils are an important resources; although the crop yields in the soils are lower, they should not be ignored nor given up. By using pot experiments, five different organic amendments (pig manure, cattle dung, chicken manure, rapeseed meal, and biochar) were used to investigate their effects on the chemical properties and enzyme activities of coastal saline soil as well as the growth of wheat. We also compared the suitable application doses of these organic amendments. After the treatment of five organic amendments, soils were incubated for 30 days at a constant temperature and moisture. The results showed that organic amendments had the property to decrease soil pH, increase organic matter, change soil enzyme activities, and promote wheat growth. With the rapeseed meal addition at the dose of 50 g kg −1 , soil pH decreased from 8.29 to 7.06, which was 14.8% lower than that in the control soil (no amendments), the organic matter as well as the activities of catalase, urease, alkaline phosphatase, and saccharase significantly increased, and the biomass of wheat increased by 48.4%. Compared with control, the rapeseed meal and pig manure were recommended as the suitable soil amendments for remediating coastal saline soil, and the suitable application dose is 50 g kg −1 . These data suggested that rapeseed meal and pig manure are an efficient choice in improving salt-induced land degradation. This study will not only lay the theoretical foundation for remediating coastal saline soil but also provide advice on selecting organic matters in ameliorating coastal saline soil.

Trichoderma Enhances Net Photosynthesis, Water Use Efficiency, and Growth of Wheat (Triticum aestivum L.) under Salt Stress

“…Likewise, Bacillus C7 was obtained from composted manure from a pig farm located in Nanpi County, Hebei Province, China. Pig manure has been used as an organic amendment of coastal saline soil for the production of wheat [ 44 ]. Following serial dilution, 100 µL of the 10 3 –10 5 dilutions were pipetted on carboxymethyl cellulose sodium salt (pH 7.0) agar medium and incubated at 50 °C.…”

Response of soil characteristics and bacterial communities to nitrogen fertilization gradients in a coastal salt‐affected agroecosystem

“…(N fertilization with 300 kg hm −2 yr −1 ) and NF3 (N fertilization with 450 kg N hm −2 yr −1 ). Prior to the experiment, an amount of 2,250 kg hm −2 calcium superphosphate, which was a kind of physiological acidic phosphorous fertilizer, was applied to all the plots as soil amendment and phosphorus fertilization supply, according to the local management practice habits (Yang, Bian, Yang, Zhou, & Tang, 2018).…”

An evaluation of the effects of microstructural characteristics and frost heave on the remediation of saline‐alkali soils in the Yellow River Delta, China

“…The degradation of soil properties results in low permeability, high bulk density, and dispersion of soil particles, which are the main factors that limit the utilization of saline‐alkali soil globally (Brinck & Frost, 2009; Ganjegunte, Sheng, & Clark, 2014; Qadir & Schubert, 2002). Current remediation practices or management measures for saline‐alkali land primarily include irrigation, addition of sediments, chemical remediation, organic amendments, and planting salt‐tolerant species (Ahmad, Ghafoor, Akhtar, & Khan, 2013; Heng et al, 2018; Li et al, 2019; Oo, Iwai, & Saenjan, 2013; Srivastava, Gupta, Shikha Singh, & Tewari, 2014; Yang, Bian, Yang, & Zhou, 2018). At present, it is generally believed that an effective control measure is the addition of gypsum and fly‐ash to saline‐alkali soils (Murtaza et al, 2017; Temiz & Cayci, 2018); however, the associated high costs and environmental pollution are issues of concern, particularly in developing countries (Pandey, Abhilash, & Singh, 2009).…”