Chara zeylanica

Chara zeylanica is a species of macroalgae belonging to the Characeae family. Often referred to as stoneworts, these organisms possess a highly complex morphology that mimics the structure of higher plants. In an agricultural context, Chara zeylanica is recognized for its vital role in maintaining the ecological balance of irrigation systems, wetlands, and aquaculture ponds.

The native range of this species spans tropical and subtropical regions worldwide. It is commonly found in freshwater or brackish environments, often thriving in warm climates. Because of its wide distribution, it is frequently encountered in water management systems associated with tropical agriculture, where it acts as a key component of the aquatic plant community.

Botanically, the species is characterized by its whorled branchlets and a central axis that often undergoes calcification, giving the plant a brittle and gritty texture. It attaches to the substrate using root-like structures called rhizoids. This species is highly efficient at nutrient absorption, particularly nitrogen and phosphorus, which makes it a major player in the nutrient cycling within shallow water ecosystems.

Regarding its requirements, Chara zeylanica thrives in clear, shallow water with a high intensity of solar radiation. It requires substrates rich in minerals and generally prefers neutral to alkaline pH levels. While not a conventional crop, its growth can be managed through water level control and light regulation within irrigation channels, ensuring it contributes to water quality rather than causing blockages.

The primary use of this plant is in the field of bioremediation, where it helps sequester excess nutrients from agricultural runoff, thereby preventing toxic algal blooms. It is also utilized as a green manure after harvesting and composting. While it is generally robust, the plant is susceptible to chemical herbicides used in rice paddies and can suffer from environmental degradation if water quality declines significantly due to pollution.