Traditional Culture Encyclopedia - Traditional virtues - What is sand? (Photo courtesy)
What is sand? (Photo courtesy)
Among them, sandy soil is weak in drought resistance, easy to leak water and fertilizer, lack of soil nutrients, clay and organic matter, weak in fertilizer conservation, and easy to lose fertilizer with rainwater and irrigation water. Therefore, in sandy soil, we should emphasize the application of organic fertilizer, timely topdressing and master the principle of frequent irrigation and thin application.
In the international system, according to the clay content of soil, the texture can be divided into three categories: sandy soil and loam with clay content < 15%; Clay content 15%~25% belongs to clay loam; Clay content > 25% is clay.
- Related articles
- Are high-level talents in Luoyang City, Henan Province directly promoted to the titles of full and senior teachers in primary and secondary schools?
- How is the education development in China?
Since the beginning of human society and its educational activities, there has been teacher work. However, specialized normal education institutions an
- Old Beijing Hutong handbill Beijing handbill
- What do you mean by descendants of the Chinese people?
- Crosstalk of four people
- 1, childlike innocence, folk customs, fine sentences, beautiful water town, Jiangnan dialect (at least 2 sentences in each part) plus comments or notes 2. Lu Xun's novels.
- What is the difference between traditional friendly cooperation and strategic cooperation?
- What are the traditional surveying and mapping methods?
- What are the three commonly used disinfection methods?
- Taking the National Day holiday as the topic, it adopts the general structure of total score, with neat handwriting, fluent sentences and appropriate details, with 400 words. please