The quality of seedlings in field permanent nursery of the North Taiga forest growing area

The article presents the results of a survey of field permanent nursery of the North taiga forest district of the Arkhangelsk Oblast. The density of seedlings ranges from 6 to 69 pcs / m², with a healthy proportion of 29–91 %.  A positive effect on the survival of seedlings of the presence of representatives of the legume family among weeds was revealed. Polyleaf lupin has a positive effect only when growing in kurtins. A high significant closeness of the relationship between the proportion of healthy seedlings and the amount of precipitation in June and July with severe contamination of crops was revealed. Despite the high projective coverage of weed vegetation in the fields, seedlings on heavily humusized soil are characterized by large sizes compared to other fields. The difference is 34 %. The indicator of the best nitrogen nutrition is the length of the needles, which increases by 36 % with a 2-fold increase in available nitrogen in the soil. In conditions of severe field contamination, the ratio of the length of the aboveground and underground part of seedlings is stable, which is 0.48 for two-year-old spruce seedlings, and 0.77 for three-year-olds. The increased content of humus contributes to the development of lateral roots. According to the ratio of thin roots to the aboveground part, seedlings of high quality are formed under these conditions. The Dixon quality index of seedlings in conditions of increased field contamination is 10 times lower compared to seedlings of standard sizes and indicates the need to grow seedlings for at least three more years.

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