What are the fertilizers that are taboo in green onion planting? These five fertilizers should be used with caution
As one of the most common vegetables, the choice and use of fertilizers when growing green onions has a crucial impact on yield and quality. However, not all fertilizers are suitable for green onion growth. This article will introduce the various types of fertilizers that should be avoided when growing green onions to help growers better manage the growth of green onions and improve yield and quality.
i.Chlorinated fertilizers.
Although chlorine-containing fertilizers such as potassium chloride and ammonium chloride can provide nutrients such as potassium and nitrogen to crops, green onions are more sensitive to chloride ions. Excessive use of chloride fertilizers can cause yellowing of green onion leaves and, in severe cases, death. Therefore, chlorine-containing fertilizers should be avoided when growing onions to avoid adversely affecting their growth.
ii - Raw fertilizer.
Raw manure refers to organic fertilizers that are not completely decomposed, such as fresh animal manure and undecomposed plant waste. These fertilizers contain a lot of microorganisms and germs, which can easily cause onion diseases and pests. At the same time, raw fertilizer releases a lot of heat during the decomposition process, which may burn the root system of the onion. Therefore, when planting green onions, you should avoid using raw fertilizers and choose organic fertilizers that are completely rotten.
3. Alkaline fertilizer.
Onions prefer slightly acidic soil, while alkaline fertilizers such as lime and plant ash increase the pH of the soil, making it alkaline. This not only inhibits the growth of onions, but also leads to the inability of trace elements in the soil to be utilized, which affects the quality and yield of onions. Therefore, alkaline fertilizers should be avoided when planting green onions.
iv High concentration of fertilizers.
Although high-concentration chemical fertilizers such as urea and ammonium sulfate can quickly provide nutrients to crops, excessive or improper use can easily lead to soil salinization, which is not conducive to the growth of onions. In addition, the nitrogen contained in high-concentration fertilizers is easy to make the green onion leaves too lush, resulting in poor ventilation and light transmission, which is easy to cause pests and diseases. Therefore, in the process of planting green onions, fertilizers should be used rationally and excessive use of high-concentration fertilizers should be avoided.
v.Fertilizers with excessive heavy metals.
Some fertilizers may contain excessive amounts of heavy metals such as lead, mercury and cadmium. These heavy metal elements not only damage the growth of onions, but also enter the human body through the food chain, posing a potential threat to human health. Therefore, when choosing fertilizers, it is necessary to check whether their heavy metal content meets the standards and avoid using fertilizers with excessive heavy metal content.
In conclusion, choosing the right fertilizer is essential to improve the yield and quality of onions during onion cultivation. Growers should avoid using chlorine-containing fertilizers, crude fertilizers, alkaline fertilizers, fertilizers with high concentrations and fertilizers with excessive heavy metals, and should choose fully decomposed organic fertilizers, microbial fertilizers and other environmentally friendly fertilizers to provide a good soil environment and nutrient support for the growth of green onions. At the same time, reasonable fertilization and scientific management are also the key to ensure the healthy growth of green onions.