After the temperature management, a closed insulation system will be implemented following planting to promote seedling growth. The conditions will be covered with small arches and two layers of curtains to maintain high temperature and humidity. One week after colonization, the heart of the plant begins to grow. Once the seedlings are eased, air should be released when the temperature exceeds 30°C during the day, and reduced to 25°C to limit air flow. The temperature should be closed at 20°C. The minimum daytime temperature should remain above 20°C, while nighttime temperatures should ideally be maintained around 15°C. In the early morning, the temperature should not drop below 10°C. If cold weather arrives, the greenhouse must be equipped with auxiliary heating systems.
Light management is crucial for eggplants, which require high light intensity. During the planting season, when natural light is weakest, reflective screens should be hung behind the greenhouse to increase light intensity and temperature. However, placing the seedlings too close to the curtain may cause wilting, so timely watering is necessary. On cloudy days, it’s important to expose the plants to sunlight, and the greenhouse film should be kept clean to maximize light penetration.
For water and fertilizer management, watering should be done immediately after planting, and watering should be avoided before fruit setting. Watering should begin once the fruit door opens. It's essential to follow the weather forecast, ensuring that water is applied at least two days after a sunny day, and always before 10:00 AM. Under-membrane irrigation should be used to reduce air humidity. Depending on the plant's growth, if the leaves are large and thin, and the first branches are close together, watering can be delayed by one day. Conversely, if the plants are short and fruits develop quickly, frequent watering is required. When the eggplant starts to expand, topdressing should be applied—25 kg of San Yuan compound fertilizer per 667 square meters, dissolved in water. After harvesting, soil cultivation fertilization can be used. The soil tends to become compacted, reducing air permeability and making it difficult for water to penetrate. After watering, only a small amount of fertilizer enters the soil. From the front of the greenhouse, loosen the soil gently with a fork without turning it over or breaking clods. Avoid digging trenches. Apply 50 grams each of potassium dihydrogen phosphate, urea, and potassium sulfate to the loose soil ridges, followed by sufficient watering. This process should be repeated about four times throughout the growing period, increasing yield by approximately 200 kg per 667 square meters. The use of carbon dioxide gas fertilizer in winter and spring quail eggplant production has shown significant results in boosting yield.
Plant adjustment is essential for overcoming challenges in winter and spring eggplant production. High humidity, low ground temperature, tall plants, and poor ventilation are common issues. Proper plant adjustment helps reduce humidity, increase ground temperature, prevent leggy growth, and balance vegetative and reproductive growth.
(1) Fruit adjustment: Each inflorescence should have only one fruit. If the fruit grows quickly but the plant does not, it should be removed promptly. If the plant becomes too vigorous, fruit harvesting should be controlled within 1–2 days.
(2) Leaf adjustment: During the initial stage of leaf development, ensure at least four functional leaves. After flowering, leave one leaf under the bud and remove all lower leaves. After harvesting, leave one leaf under the eggplant and remove the rest. Monitor plant growth and canopy density to ensure some light reaches the ground. Too few leaves can reduce the photosynthetic rate and affect yield.
(3) Pruning: In winter and spring sun greenhouses, double-drying and pruning are commonly used. Side branches should have two leaves left, while fruitless branches are removed. Repeat this process for the "four mothers." For octahedral branches, only two branches should be allowed to grow.
Cylindrical Roundness Tester
A measuring instrument for quantitatively evaluating the cylindricity of a cylinder by measuring the actual contour of the cylinder using the precise rotation centerline as the reference standard and the precise linear motion guide rail as the reference standard. It can be used to measure cylindrical shape errors (roundness, cylindricity, straightness, and flatness), position errors (coaxiality and verticality), etc.
The cylindrical Roundness Tester is mainly used to measure the roundness, cylindricity, straightness, concentricity, coaxiality, flatness, parallelism, perpendicularity, surface waviness, discontinuous surface, etc. of various regular and irregular circular workpieces. It can also perform spectrum analysis, wave height analysis, eccentricity, shaft bending analysis, and runout analysis on workpieces.
This device has excellent cost-effectiveness, full measurement capability, and is easy to learn and use.
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