Abstract
The impact of salinity on paddy production in Indonesia was pronounced with an average decline of 6.83% (2015-2019). Salinity interferes with macronutrients' absorption into plants, causing stunted growth (salinity contributed to a 42% decrease in paddy production). One solution to solve the salinity problem in paddy is to use saline varieties. There were very few studies on macronutrient content analysis in resistant varieties response to the salinity source's distance. This research conducted in Jabon Sidoarjo, Indonesia, aims to see the macronutrient response and plant growth to the saline source's distance. This research was conducted in Jabon District, Sidoarjo Regency, using two transects with a length of 2 km and 3.4 km, respectively. The distance between the research location and the salinity source was 10.65 km. The survey used a free grid to adjust paddy fields' location and the presence of resistant varieties. The results showed that the closer to the salinity source, the salinity indicators consisting of Electrical Conductivity, Sodium Adsorption Ratio, Exchangeable Sodium Percentage, and pH H2O would increase. The increase in salinity then affects the decrease in macronutrients (Nitrogen, Phosphor, and Kalium) in plants. However, tillers and leaves (length and number) were unaffected by high salinity levels in the soil.
Highlights
Salinity is a soil condition with dissolved salts accumulation on the soil surface, affecting agricultural production, biodiversity, and sustainable development
The analysis results show that all salinity indicators fall into the criteria for saline soil
The varieties used at all observation points were Ciherang, Inpari 32, and Inpari 42 varieties, where the varieties were different for each observation point
Summary
Salinity is a soil condition with dissolved salts accumulation on the soil surface, affecting agricultural production, biodiversity, and sustainable development. Saline soil is usually located on dry and semi-dry land, can be caused by evaporation, an intrusion of seawater, and its parent material (Gopalakrishnan and Kumar 2020). Saline soil is generally found in fluvio-marine and marine landforms and topographically tend to have a sloping slope (Hasmunir 2017). The formation process causes high salt deposits in the marine landform and fluvial-marine. Marine landform comes from seawater activities (Dewadaru and Saputro 2014) and the fluvio-marine landform is formed due to seawater activities and river activities (Wulan et al 2016). Saline soils are different from sodic and salinesodic soils. Saline soils have pH < 8.5 with electrical
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