How to fertilize lettuce
Lettuce is a common vegetable in our life. Its stem can be fried or cold, crisp and nutritious, and the leaves can be eaten. It is also called lettuce. If you want to grow lettuce, the important thing is to fertilize, then how to fertilize lettuce? Let's take a look.
1, the characteristics of fertilizer
Lettuce needs more than a dozen elements in its growth. The most common ones are the three conventional elements of NPK. The demand for potassium is the largest. According to research, for every 1000 kg of lettuce, 4.5 kg of potassium is needed. It does not require a high amount of fertilizer during the seedling period, and as it grows larger, the demand for fertilizer is increasing. During the period of lettuce, the amount of fertilizer is the largest. During this period, the demand for nitrogen fertilizer accounts for more than 80% of the whole growth period.
2, the principle of fertilization
Lettuce needs more elements, so in order to avoid the occurrence of deficiency syndrome, it is necessary to increase the application of organic fertilizer to provide growth. At the same time, it is necessary to control the nitrogen fertilizer to avoid excessive application of nitrogen fertilizer, which affects the absorption of other elements by the root system. Apply potassium fertilizer. Fertilization is based on base fertilizer, and the amount of topdressing is applied. The topdressing fertilizer is based on nitrogen fertilizer and is reasonably matched with phosphorus and potassium fertilizer. Combined with water management during fertilization, it can improve the utilization of fertilizer, accelerate the absorption by roots, and promote growth.
3. Fertilization advice
The base fertilizer is generally applied to 1000-1500 kg of decomposed farmyard manure per acre, and the later topdressing should be carried out according to the yield per mu. For the plots with a yield of more than 3,500 kilograms per mu, 10-12 kg of nitrogen fertilizer, 4-6 kg of phosphate fertilizer, and 10-14 kg of potash fertilizer should be applied per mu. The yield per mu is 2500-3500 kg, and the nitrogen fertilizer per mu is 6-10. Kilograms, phosphate fertilizer 3-4 kg, potassium fertilizer 8-10 kg. According to this ratio, as the yield per mu decreases, the application amount of NPK is gradually reduced.
4, matters needing attention
At the time of fertilization, it should be noted that the acid resistance of lettuce is poor, so try to use less acidic fertilizer when fertilizing. When the soil pH is lower than 6, it is necessary to adjust 150-200 kg of lime per acre. Nitrogen fertilizer should be applied as top dressing, which is generally divided into three stages. Potassium fertilizer is generally used as base fertilizer, and the rest is applied in two times. Phosphate fertilizer is used as base fertilizer.
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