When photovoltaic panels meet farmland, they not only create clean electricity, but also give birth to a new ecological model of "photovoltaic+agriculture". This cross-border integration breaks the dilemma of "power generation and land competition". By scientifically designing the spacing and height of photovoltaic panels, it achieves the dual benefits of "efficient power generation on the panels and characteristic planting under the panels", allowing one acre of land to generate two values, becoming an important combination point for rural revitalization and energy transformation.
1 Light and Shadow Control: Customizing a 'Sunshine Formula' for Crops
The shading characteristics of photovoltaic panels provide a natural growth environment for shade loving crops, and by adjusting the tilt angle and array spacing of photovoltaic panels, the ground light intensity can be precisely controlled, forming a "customized light and shadow zone". In a photovoltaic agricultural park in Hebei Province, photovoltaic panels are installed at a 25 degree angle with a row spacing of 8 meters, providing the ground with 50% -70% natural light transmittance, which precisely meets the growth needs of edible mushrooms such as shiitake mushrooms and shiitake mushrooms. In the greenhouse built under the board, the growth cycle of edible fungi is shortened by 10 days under scattered light environment, and the yield per mu is increased by 20%. At the same time, the obstruction of photovoltaic panels reduces water evaporation in the greenhouse, and irrigation water consumption is reduced by 30%.
For light loving crops, collaboration is achieved through "dynamic dimming" technology. In the "Photovoltaic+Alfalfa" base in Inner Mongolia, the photovoltaic panel bracket is equipped with a rotatable drive device to adjust the shading rate according to different growth stages of alfalfa: shading 30% during the seedling stage to avoid strong light burns, and reducing to 10% during the adult stage to ensure photosynthesis. This intelligent regulation enables the yield of alfalfa hay to reach 1.2 tons/acre, which is on par with pure farmland, while the annual power generation of photovoltaic panels reaches 12000 kWh/acre, resulting in a 40% increase in comprehensive income per acre compared to simple planting or power generation.
2 Stereoscopic Planting: Maximizing Land Use Efficiency
The three-dimensional mode of "photovoltaic+aquaculture" shines brightly in southern water towns. The "Fishery Photovoltaic Complementary" power station in Jinhu, Jiangsu Province has installed photovoltaic panels above a 1.2-meter-deep fish pond, and fish bass and crayfish are raised under the panels. Photovoltaic panels block sunlight and inhibit algae growth, making it easier to maintain water quality in fish ponds and reducing feed intake by 15%; The reflection on the water surface of the fish pond reduces the temperature by 5-8 ℃ through photovoltaic panels, resulting in a 3% increase in power generation efficiency. In this mode, the annual production of fish and shrimp in each acre of fish pond is 200 kilograms, and the photovoltaic power generation income is 3000 yuan, which is twice the comprehensive benefit of traditional fish ponds.
In arid regions, the circular model of "photovoltaic+forage+aquaculture" achieves a win-win situation for ecology and economy. In the photovoltaic power station in Zhongwei, Ningxia, purple clover is planted under the board, and three harvests are harvested every year for sheep feeding. Photovoltaic panels reduce surface wind speed, decrease water evaporation, and increase the survival rate of alfalfa from 60% to 90%; Sheep manure is used as organic fertilizer to nourish the soil, forming a closed loop of "power generation - grass planting - sheep farming - fertile fields". In the past 3 years of project operation, the local vegetation coverage rate has increased from 35% to 70%, and the annual income per mu of land has exceeded 5000 yuan.
3 Technological Empowerment: Intelligent Systems Achieve Precise Management
The application of IoT technology makes photovoltaic agriculture management more efficient. The "Photovoltaic+Vegetable" base in Dezhou, Shandong Province has deployed soil moisture sensors, temperature and humidity sensors, and insect monitoring lights under each photovoltaic array, and the data is transmitted in real-time to the cloud platform. The system automatically adjusts the angle of the photovoltaic panel (adjusts shading rate), turns on drip irrigation equipment, or activates insecticidal lamps based on the vegetable growth model, reducing labor costs by 60%. Lettuce grown in a smart greenhouse can achieve a yield of 4000 kilograms per mu through precise control of light and moisture, with zero pesticide residue, making it a sought after product in high-end supermarkets.
The "additional functions" of photovoltaic panels further enhance their overall value. Some power stations have designed the photovoltaic panel brackets as movable track type, which can be moved to one side during the harvest season to facilitate the entry of large harvesters; The LED fill lights installed under the board provide additional light for crops on cloudy or winter days, ensuring that the land of the photovoltaic power station can still maintain agricultural output under low light conditions. The "Photovoltaic+Strawberry" project at a certain base in Anhui Province has advanced the market launch of strawberries by one month through supplementary lighting technology, seizing the Spring Festival market and increasing the selling price by 20 yuan per kilogram.
The integration of photovoltaics and agriculture is essentially the intensive utilization of resources such as sunlight and land. This model not only solves the land constraint problem in the development of new energy, but also allows farmers to obtain dual income through participating in planting and operation while obtaining land rent. With the maturity of technology and innovation of models, "on-board power generation and off board gold generation" will take root in more regions and become an important force in promoting agricultural modernization and energy greening.