A method for applying nitrogen fertilizer to Chinese pine container seedlings

Abstract

The invention mainly relates to a nitrogen fertilizer application method for Chinese pine container seedlings, which belongs to the fertilization technology for forest tree container seedlings. From the germination of Pinus tabulaeformis to the end of mid-September, nitrogen fertilizer was applied by exponential fertilization method. Nitrogen was applied once a week, and nitrogen was applied 25 times in total. Each nitrogen application increased exponentially, and the cumulative nitrogen application amount was 100mg / plant. The biomass and nitrogen content of pine container seedlings were 0.948g / plant and 18.9mg / plant respectively; the seedling height of Chinese pine container seedlings was 8.4cm, the ground diameter was 2.86mm, and the thickness of terminal buds was 3.30mm. Compared with the seedling height and ground diameter of 1-year-old Chinese pine container seedlings stipulated in the industry standard of the People's Republic of China "Container Seedling Technology" LY1000-91, the diameter increased by 20% and 43% respectively; the proportion of qualified seedlings was listed as 96.9%, which is much higher Based on the 85% requirement stipulated in the national standard.

Description

1. Technical field [0001] The invention relates to a fertilization method for container seedlings, in particular to a nitrogen fertilizer application technology for container seedlings of Chinese pine. 2. Background technology [0002] Container seedling cultivation is a method of seedling cultivation in a container with a substrate. Since the substrate itself can provide less nutrients to the seedlings, the nitrogen fertilizer required by the seedlings mainly depends on artificial addition. Exponential fertilization is a steady-state nutrient loading technique that is mainly used in the application of nitrogen fertilizers. During the growing season, nitrogen fertilizers are applied to the seedlings multiple times, and the amount of nitrogen applied each time increases exponentially. The amount of nutrients provided to the seedlings is synchronized with the growth and development requirements of the seedlings, so that the seedlings accumulate a large amount of nutrients. A...

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Problems solved by technology

Because the concentration of nitrogen fertilizer is equal each time, and the size of Chinese pine seedlings increases day by day, the amount of nitrogen applied does not coincide with the growth rhythm of seedlings, thus affecting the quality of seedlings

At the same time, producers often determine whether to fertilize Chinese pine according to the growth of seedling height and ground diameter. The fertilization of Chinese pine is mainly concentrated in May-June when the seedling height and ground diameter are fast-growing, while in July-September, Chinese pine The biomass of seedlings is still increasing, and the demand for nitrogen fertilizer is still increasing, but the application of nitrogen fertilizer is stopped in production. The biomass of seedlings and the nitrogen content in the body will inevitably be affected, and the effect of afforestation will not be utilized.

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