Detailed Explanation of the Latest Technical Points for Spring Onion Cultivation and Management
Spring onion cultivation requires attention to sowing time, or the later division time, taking into account natural conditions such as temperature and light that affect sowing. How to regulate these factors. In addition, regarding soil treatment for planting, and how to fertilize at each stage, what fertilizer to apply, and what the requirements are. What are the specific planting time and water control measures. How to handle pests and diseases if they occur in the field. These are all part of cultivation management. This article mainly introduces the detailed content of spring onion cultivation and management.
1. Sowing Time
Spring onion seeds can germinate above 5°C, which is 5°C lower than the germination temperature of small spring onion. However, above 13°C, germination is fast and uniform. Above 10°C, aboveground leaf growth is normal, and 15°C to 20°C is the best temperature for plant growth. Above 30°C, growth is slow. During low-temperature periods, film mulching can be used for sowing; in winter, facility temperature regulation can be used for cultivation; in high temperatures, shade can be used to cool down. Spring and autumn are suitable for open-field cultivation.
2. Land Preparation Requirements
When conditions are limited, poor soil can be improved before planting. For improvement, river sand and disinfected humus soil can be directly mixed with 1600 jin of decomposed livestock manure per mu and incorporated into the field. The original soil can be dug out, or the topsoil can be tilled fine and mixed together. Fertile soil only needs plowing, rotary tilling, weeding, and leveling the soil, then spraying chemicals to kill insect eggs and pathogens. After that, the land should be sun-dried for three days to sterilize, ensuring the safe interval for the chemicals.
3. Fertilizer and Water Requirements
During growth, spring onion mainly grows leaves and underground rhizomes. Most of the fertilizer should be nitrogen fertilizer, followed by potassium fertilizer, with phosphorus fertilizer being the least. Later topdressing should be applied in small amounts multiple times, because the leaves need to be maintained without drying out or yellowing throughout the entire growth period. Since the growth period is short, fertilizer and water management cannot be relaxed. Generally, water once a week, because the root system is small and absorption capacity is weak, and it is also afraid of drought
Therefore, it is necessary to water multiple times but not too much at once, as it is prone to waterlogging.
⟦NL>4. Transplanting Time
When seedlings grow to about 8 cm, they are divided and transplanted to the field. This ensures appropriate planting space in the field and also allows rapid large-scale planting. The transplanting plant spacing is 6 cm, and row spacing is 5 cm. Then the planting depth is 5 cm, the planting row width is 1.2 m, the length is about 5 m, and the row ditch spacing is 20 cm, which facilitates management. Planting should be done shallowly and sparsely.
5. Pest and Disease Control
It is prone to soft rot infection, which produces a foul odor after rotting. In the early stage of the disease, agricultural streptomycin is sprayed on the stem base, the part near the ground, and the whole field is sprayed. If the disease is severe, pull out the plants promptly, take them out of the field, sun-dry and burn them. The main pest is the onion aphid, which gathers at the tillering area and causes damage. Later it covers the whole plant. Apply 2 kg of 5% phoxim granules per mu by broadcasting beside the roots. Or spray 1 kg of compound Sophora flavescens insecticide.
These are the management contents related to spring onion after planting. The article content is mainly provided for everyone's reference, hoping to offer some help to those in need. Thank you for reading and supporting. For more detailed content, you can refer to more sources and obtain through consultation. For other agricultural content, follow for subsequent updates.