DETERMINING MORPHOLOGICAL AND CHEMICAL CHARACTERISTICS OF SALINE SOIL PROFILE IN RICE - SHRIMP AREA IN THOI BINH DISTRICT, CA MAU PROVINCE

Abstract

The study aimed to determine the morphology and chemical traits in rice - shrimp farms in Thoi Binh district, Ca Mau province. The description of soil morphology was based on the color comparison of Munsell. Soil samples were collected according to horizons of soil profile to analyze soil chemistry. According to the morphology result, the rice - shrimp soil in the current study was alluvial soil with Mollic horizon, slightly salinized, and categorized as Molli Hyposalic Gleysols. For the soil chemistry, the soil pH_KCl was moderate, roughly 5.41 - 6.15. The total N at the surface horizon was low, while the available N ranged from 201.0 to 312.3 mg kg^-1. However, the total P was poor and the soluble P at the surface horizon was roughly 3.09 - 29.5 mg P kg^-1, while the contents of insoluble P compounds, such as Al-P, Fe-P, Ca-P were high, roughly 13.5 - 27.1, 85.9 - 214.4 and 16.1 - 35.3 mg kg^-1, respectively. The Na⁺ was 12.1 - 15.3 meq Na⁺ 100 g^-1 soil. Moreover, the organic matter was determined to be extremely low to low.