T/ZJNJ 0036-2025 Technical Specifications for the Construction of a Low-Carbon Ecological Rice-Duckweed System

Scope

Scope: This document defines the relevant terms and definitions for the construction of a low-carbon ecological rice-duckweed system, and stipulates the operational requirements for the selection of duckweed varieties, their propagation, collection, release, management of the rice-duckweed system, pest and disease control, and returning the duckweed to the field at the end of the season. This document is applicable to guiding the construction of low-carbon ecological and sustainable rice field ecosystems in southern China. Main technical content: Tailwater ponds, ditches, or fallow fields in rice field systems can be selected as duckweed conservation and propagation sites. Tailwater ponds should be chosen with a water depth of about 1 m and a large amount of sediment. Ditches should be selected in areas with slow water flow and minimal water level fluctuations, and measures such as nets should be used to prevent duckweed from being washed away by water currents. When setting up these measures, the drainage capacity of the ditches should not be affected. Fields should be selected with medium or higher fertility and convenient irrigation and drainage, with priority given to fields with poor light and heat conditions. For propagation and maintenance in tailwater ponds and ditches, natural nutrients are generally used to maintain duckweed growth, without the need for additional fertilization. Water quality monitoring should be strengthened to avoid water quality deterioration or other floating objects covering and affecting duckweed growth. For propagation in selected fields, commercial organic fertilizer should be applied, with an appropriate dosage of 10 t/hm2 to 15 t/hm2. The initial duckweed release quantity should be sufficient to cover 60% to 80% of the field. Water management involves shallow water (10 mm to 30 mm) for duckweed propagation and deep water (50 mm to 100 mm) for duckweed collection. Duckweed should be regularly collected and removed from the propa

Development Information

Related Standards