Does the lotus plant need sunlight?
As a typical aquatic plant, the cultivation and management of lotus often raise two major questions: Does this graceful water beauty require abundant sunlight? Can its growth environment coexist harmoniously with ornamental fish? This article will delve into these two key issues, providing scientific maintenance solutions for lotus enthusiasts.
Lotus Photosynthesis System and Light Requirements
Relationship between Daylight Duration and Growth Cycle
The lotus is a strong sun-loving plant, and its leaves are covered with a special waxy layer that has evolved to adapt to intense sunlight. Experimental data shows that more than 8 hours of direct sunlight per day can increase the flowering rate by 30%, while reducing sunlight to less than 4 hours can cause the chlorophyll content in leaves to decrease by 40%. It is recommended to provide full sunlight in spring and autumn, and to set a 30% shade net at noon in the peak summer to avoid leaf scorching from high temperatures while ensuring photosynthetic efficiency.
Consecutive Reactions of Insufficient Light
Persistent low-light conditions can trigger a series of vicious cycles: Initially, new leaves turn yellow and the petioles become thin and elongated; in the middle stage, the formation of flower buds is hindered, and the shedding rate of existing flower buds increases; long-term lack of light can lead to root rot, with the mortality rate of the entire plant reaching over 75%. In indoor maintenance during winter in northern regions, it is recommended to use full-spectrum plant growth lights to maintain a light intensity of 6000-8000Lux.
Building a Lotus Pond Ecological Symbiotic System
Selection of Fish and Symbiotic Principles
Opt for small, gentle fish species such as green gourami and white cloud golden, whose feeding habits can effectively control the growth of algae. The nitrogen and phosphorus elements produced by the decomposition of fish feces meet the nutrient requirements of 3.2g per square meter per year for lotus. Avoid introducing large fish like koi, as their biting behavior can cause leaf damage rates of over 60%. The best time to introduce fish is 2 weeks after the lotus floating leaves have unfolded, by which time the aquatic ecosystem has become初步 stable.
Key Techniques for Water Quality Maintenance
Use a 3cm thick layer of volcanic rock to cover the bottom mud, which not only prevents fish from stirring up the water but also supports the proliferation of nitrifying bacteria due to its porous structure. Maintain a water depth of 30-50cm, replace 1/3 of the water every 10 days in summer, and aerate to remove chlorine before use. Regularly test the pH to keep it between 6.5-7.2, and immediately increase aeration when the ammonia-nitrogen concentration exceeds 0.2mg/L.
By scientifically adjusting light intensity and building an ecological cycle system, the lotus can not only bloom beautiful and elegant flowers but also form a sustainable symbiotic landscape with fish. Mastering these key elements allows every gardening enthusiast to create a fascinating water scene with the scent of lotus and the shadow of fish.