Nanyang Shiqiao Rose Seedling Raising Period Management
Today, we will explain in detail the topic of Nanyang Shiqiao rose seedling raising period management for netizens. Keep reading!
Nanyang Shiqiao Rose Seedling Raising Period Management
Temperature management: Before the rose seedlings emerge, a higher temperature (25-30°C) is required. When 70% to 80% of the seedlings emerge, the temperature during the day should be reduced to 20-25°C, and at night to 15°C. Since the hypocotyl grows fastest during the period from the emergence of rose seedlings to the expansion of cotyledons, it is the stage most prone to seedling stretching, so special attention should be paid to temperature control to prevent seedling stretching.
Rose
① Temperature management: Before the seedlings emerge, a higher temperature (25-30°C) is required. When 70% to 80% of the seedlings emerge, the temperature during the day should be reduced to 20-25°C, and at night to 15°C. Since the hypocotyl grows fastest from the emergence of seedlings to the expansion of cotyledons, it is the stage most prone to seedling stretching, so special attention should be paid to temperature control to prevent stretching. After the first true leaf unfolds, the seedlings are less likely to stretch, so the bed temperature should be increased again to about 30°C, and the minimum night temperature should be 15°C. After the seedlings have two true leaves, the bed temperature should be gradually reduced to make the temperature inside the bed gradually close to the outside temperature for pre-plant training. Additionally, using day-night temperature difference is an effective method for cultivating strong seedlings. When the true leaves of the seedlings appear, the temperature inside the bed during the day should be about 30°C, and the night temperature should not be lower than 15°C. This is beneficial for root growth and can inhibit respiration and the growth of aboveground parts, which is favorable for cultivating strong seedlings.
During cold seasons, to achieve the above temperature requirements, the following management should be noted: Ensure more sunlight enters the seedling bed to increase the bed temperature. For example, remove opaque covers such as straw mats in a timely manner and keep the plastic film on the bed clean; cover the straw mats tightly at night to maintain the bed temperature and avoid ventilation; once the seedlings start to emerge from the soil, immediately remove the plastic film; ventilation and release are the main methods to adjust the temperature and humidity inside the bed, and should be flexibly controlled according to the growth of the seedlings and weather conditions. When encountering extreme weather, special attention should be paid to local weather forecasts and timely preparations for cold protection measures should be taken. When there are several consecutive days of low-temperature, rainy (or snowy) weather, special attention should be paid to uncovering and covering the straw mats to improve temperature and light conditions. A 0.1% to 0.3% glucose solution can be sprayed on the leaves to supplement nutrients. As long as it does not rain or snow during the day, uncover the straw mats to ensure there is some scattered light in the seedling bed; when the sun comes out during breaks in the rain or snow, quickly open small vents for air exchange. After consecutive cloudy days, the first sunny day may cause seedling wilting or softening. In such cases, immediately cover the seedlings with straw mats for shading or use a method of uncovering and covering the straw mats until the seedlings recover.
For managing seedling bed temperature during hot seasons: High summer temperatures can easily cause viral diseases in seedlings, so it is necessary to have shading equipment in the seedling bed to lower the temperature. Cover the sunshade net on sunny days with strong sunlight, and do not cover it on cloudy days, in the morning, and at dusk. Cover it during the day and not at night, allowing the seedlings to see direct sunlight before and after planting to prevent stretching.
② Water and fertilizer management: Rose seedlings require very little water. After sufficient irrigation before sowing, there is usually no need to water again. Otherwise, irrigation can cause a decrease in soil temperature, leading to poor root development, slow growth of the seedlings, and creating a low-temperature, high-humidity microclimate that can induce damping-off disease. When irrigation is necessary, choose a sunny morning for light irrigation and avoid heavy irrigation. Attention should be paid to reducing the humidity of the seedling bed, especially during long periods of cloudy and rainy weather, while also maintaining ventilation. In summer, due to rapid water evaporation, the seedling bed should not be too dry, and a small amount of water can be sprayed when the seedlings are short of water. After the seedlings emerge, strict control of watering should be maintained to prevent seedling stretching. Controlling water for the seedlings can moderately inhibit growth and enhance the seedlings' resistance to stress, making them adapt to post-planting weather conditions.
Seedlings generally do not require topdressing, as they rely on the nutrients stored in the cotyledons from germination to the expansion of the two cotyledons. Afterwards, the roots have a strong absorption capacity. In general, as long as the nutrient soil is properly proportioned, it should not be a problem to maintain the seedlings until they have 3 to 4 true leaves. If the seedlings later become weak and the leaves show a light color indicating a nutrient deficiency, a foliar spray of 0.2% to 0.3% urea and potassium dihydrogen phosphate can be used as external root fertilization.
③ Disease and pest control: The common diseases during the seedling raising period are damping-off disease, and the common pests are the melon beetle and the ground beetle (H). Identification and control methods can be referred to in the disease and pest control section.
A strong seedling is one that meets the following criteria: 30-35 days old with 3 to 4 true leaves, large seedlings with a height below 10 cm, a thick and strong hypocotyl, the cotyledon node not more than 3 cm from the ground, intact cotyledons, thick and deep green true leaves without spots or pests, intact nutrient soil blocks, and well-developed roots with thick main and lateral roots, with no damage to the aboveground and underground parts.
This article shares a comprehensive explanation of the Nanyang Shiqiao rose seedling raising period management methods, hoping to solve your green plant problems.