What is the law of cucumber fertilizer requirement?

Cucumber is a shallow-rooted cultivated crop, which needs a lot of fertilizer. According to the statistics of research data, nitrogen (N)3㎏, phosphorus (P2O5)1.2 ~1.8 ㎏, and potassium (K2O) 3.5 ~ 4.5 are required for each commercial cucumber. So, what is the law of cucumber fertilization? Next, let's talk about the law of cucumber fertilizer demand and how to apply fertilizer scientifically.

Law of fertilizer requirement of cucumber

The law of fertilizer requirement of cucumber at different growth stages is different. In addition, different planting methods have different fertilizer requirements.

First, the law of fertilizer demand at different growth stages

Before the fruiting period (from sowing to the end of vine pulling): Does the growth of cucumber occupy the whole growth period at this stage? However, the absorption of nitrogen, phosphorus and potassium is very small. Nitrogen, phosphorus and potassium only account for 2.5%, 65,438+0.2% and 65,438+0.5% of the total fertilizer requirement in the whole period, but although the proportion is small in number, it is very important, especially for plant development and flower bud differentiation. Fruiting period: After entering the fruiting period, the renewal cost of cucumber increased rapidly, and the fertilizer demand reached its peak in the fruiting period, with nitrogen accounting for 50%, phosphorus accounting for 47% and potassium accounting for 48% of the total fertilizer demand. As a result, the demand for the three elements was relatively reduced in the later period. Second, the law of fertilizer demand under cultivation mode

Nitrogen fertilizer: The nitrogen absorption rate of cucumber cultivated in greenhouse is 57% higher than that of cucumber cultivated in open field, and the absorption amount is 28% higher. Phosphate fertilizer: there is not much difference between the demand and absorption of phosphate fertilizer. Potassium fertilizer: Compared with open field cultivation, the absorption rate of potassium fertilizer in greenhouse cucumber was not obvious in the early stage, but it reached a peak in the full flowering stage. Therefore, cucumber cultivated in greenhouse is prone to premature aging in the later stage, and attention should be paid to supplementing nutrition in the later stage to prevent premature aging. Third, scientific fertilization of cucumber.

Base fertilizer: Base fertilizer is an important source of nutrition for the whole growth and development period of cucumber. The decomposed high-quality organic fertilizer is 2000㎏ per mu, and 45% balanced potassium sulfate compound fertilizer (15-15) is applied for 40-50 ㎏, and a small amount of biological fertilizer can be added to improve the soil. If it is cultivated in greenhouse, the amount of organic fertilizer can be appropriately increased. Topdressing: The principle of cucumber fertilization is to catch a small amount for many times. After planting, combine with watering and apply nitrogen fertilizer once, and the application amount per mu is 8 ㎏; From fruiting to expansion to the end of harvesting, it is necessary to topdressing for many times, with 4-5 ㎏ urea per mu and 45% balanced compound fertilizer 15-20 ㎏ at the full melon stage. In addition, cucumber cultivated in greenhouse should be sprayed with anti-aging chemicals to prevent premature aging. Anyway. Although the growth period of cucumber is different, the demand for fertilizer is different, but the small demand does not mean that it is not important. Therefore, fertilization should be scientific and reasonable according to the different needs of fertilizers in different periods. Only in this way can your cucumber planting get a bumper harvest.