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Науковий BicH и к Н/1ТУ УкраТни Scientific Bulletin of UNFU
http://nv.nltu.edu.ua https://doi.org/10.15421/40280313 Article received 04.04.2018 р. Article accepted 26.04.2018 р.
УДК 630*237:631.86:582.475
ISSN 1994-7836 (print) Ш1 ISSN 2519-2477 (online)
@ El Correspondence author V. Yu. Yuhnovskyi yukhnov@ukr.net
V. Yu. Yuhnovskyi1, Yu. S. Urliuk1, M. P. Holovetskyi2,1. L. Sereda2
1 National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine 2 SE "Vyshche-Dubecansky Forestry", State Forest Resources Agency of Ukraine, Pirnovo, Ukraine
IMPACT OF ORGANIC FERTILIZER "DOSTATOK" ON THE SURVIVAL
AND GROWTH OF PINE PLANTATIONS
The survival and growth of pine plantations, created at the clear cuttings, with the use of organic fertilizer "Dostatok" are analyzed. The research was conducted in 11 forest units of the State Enterprise "Vyshche-Dubechna Forestry" in the fresh poor and rich forest sites. The plantations were created according to the following schemes: 4 rows of Scotch pine and 1 row of red oak with placement of seedlings 1.5x0.5 m and 1.5x1.0 m by planting them in a furrow formed by a plow PKL-70. The total forest pine plantations with application of fertilizer amounted to 22.2 hectares. The agrochemical analysis revealed that 40.6 % of organic matter was concentrated in the fertilizer, whereas in the organic layer of fresh poor and rich pine sites, the content of humus was 22.2 % and 30.7 % respectively. At the same time, fertilizer is characterized by a neutral environment, while the organic soil of fresh poor and rich pine sites has a very high acidity of the pH of the salt extract, which fluctuates within 3.5-3.6. The double predominance of the organic matter content in the fertilizer promotes the survival and growth of pine plantations. It was established that the introduction of fertilizer "Dostavok" in the form of tablets on the root system of pine seedlings increases the survival of forest plantations, which on sandy and sandy loam soils, respectively, reaches 90 and 95 %. Values of pH salt extraction indicate that the soils are very acid (3.5 and 3.1), with an average level of humus (2.4 and 7.4 %), low levels of ammonia and nitrate nitrogen and mobile phosphorus. Soil of fresh poor pine site has an elevated level of mobile potassium (139.87 mg-kg-1), while the fresh rich pine site is characterized by a low level of potassium, which is 46.39 mg-kg"1. Granulometric analysis of the soil showed that the poor sites are represented by sandy soils and rich sites - rough-dust sandy loam soils. Almost double the predominance of the organic matter content in the fertilizer "Dostatok" contributes to the survival and growth of pine plantations. The annual increment of pine seedlings on 4-7 cm was more than at the control. The use of bio-fertilizer also reduces the number of manual care and accelerates the closure in the rows, which in turn allows the transfer of forest crops to covered forest area a year earlier.
Keywords: nutrients; type of forest sites; sandy soil; seedling; root system; annual increment.
Introduction. The properties of soils of forest ecosystems after clear cuttings are still far from optimal. In most soils, there is a decrease in the content of humus, a negative balance of nitrogen, phosphorus, potassium, microelements and, consequently a decrease in the survivability and growth of forest crops. Improvement of soil fertility prevents its depletion, bogging, contaminating with various toxic substances. Organic and mineral fertilizers play a significant role in improving the quality of soil (Hrom, 2005; Marchuk et al., 2010; Pinchuk, , & Hengalo, 2018). Organic fertilizers contain macro- and micro-elements, various physiologically active substances useful for plants, microorganisms, antibiotics, etc. Organic fertilizers contribute to the better flow of biological processes and improve the physical and chemical properties of the soil. Under proper use, organic fertilizers are a powerful reserve for increasing of soil fertility. The introduction of organic fertilizers on depleted nutrients in sandy and sandy loam soils increases the survival of forest plantations and soil fertility, accelerates the transfer of forest plantations to forest-covered areas.
Analysis of recent researches and publications. Nutrient fertilizer is the main element of the food contained in it. There are simple ones that contain one element of nutrition (nitrogen, phosphorus, potassium - macro elements; boron, manganese, molybdenum - micro elements), and complex mineral fertilizers containing two or more elements of nutrition (Marchuk et al., 2010).
The ratio of the amount of nutrient fertilizer taken away by a harvest, to the total amount of nutrient introduced with fertilizer, is characterized by the fertilizer use coefficient. On average, for all tree plants, the fertilizer use coefficient is for: nitrogen - 40-50 %, phosphorous - 10-25 %, potash - 50-60 %. An indicator of the quality of fertilizer is the content of nutrients in a form suitable for the assimilation of plants. To characterize the fertilizers, the mass fraction of nitrogen, phosphorus and potassium is determined in them in terms of N, P2O5, K2O.
For the efficient and rational use of fertilizers in forestry production, the choice of methods for fertilizing the soil in accordance with the biological characteristics of plants is of
1нформащя про aBTopiB:
Юхновський Василь Юршович, д-р с.-г. наук, професор. Email: yukhnov@ukr.net; yukhnov@nubip.edu.ua Урлюк Юрм Станклавович, здобувач. Email: yuriurluk@ukr.net
Головецький Михайло Петрович, канд. с.-г. наук, директор. Email: Dybechnja@ukr.net Середа 1ван Леошдович, шженер з лковщновлення. Email: vanyasereda1985@ukr.net
Цитування за ДСТУ: Юхновський В. Ю., Урлюк Ю. С., Головецький М. П., Середа I. Л. Impact of Organic Fertilizer "Dostatok" on the
Survival and Growth of Pine Plantations. Науковий вкник НЛТУ УкраТни. 2018, т. 28, № 3. С. 62-66. Citation APA: Yuhnovskyi, V. Yu., Urliuk, Yu. S., Holovetskyi, M. P., & Sereda, I. L. (2018). Impact of Organic Fertilizer "Dostatok" on the Survival and Growth of Pine Plantations. Scientific Bulletin of UNFU, 28(3), 62-66. https://doi.org/10.15421/40280313
great importance (Marchuk et al., 2010). Fertilizers are introduced into the soil in a certain amount, which is determined by the norms and dosages of introduction.
Recently, organic fertilizers are widely used in forestry practice. So, for the cultivation of the planting material of common oak with a closed root system in individual containers with agro-fibre, the humate fertilizer "Rokohumin" was tested (Danilenko et al., 2016). The effectiveness of the fertilizer depends on the method of introduction and concentration of working solutions. The use of "Rokogumin" makes it possible to get the planting material of a certain sizes, in particular large-sized, for use not only in forest-cultivated production, but also in the garden-park industry.
Organic fertilizers contain the most important nutrients mainly in organic form and a large number of microorganisms. These include manure, peat, bird droppings (guano), various composts, organic waste from the urban economy (sewage, sewage sludge, and urban debris), sapropel, and green fertilizer. The effect of organic fertilizers on the crop yields is evident for 3-4 years or more (Marchuk et al., 2010; Sherstobaeva, 2003).
The purpose of the research is to assess the impact of the organic fertilizer "Dostatok" on the survival and growth of pine plantations in fresh pine sites and to make recommendations for the use of organic fertilizer for the creation of Scotch pine plantations on the soils of light mechanical composition.
Materials and methods of research. The research was done at the Vyshcha-Dubechna forestry enterprise. The experimental objects are located in the forest areas of the enterprise, the territory of which belongs to the Eastern-Po-lissya district of the forestry area and is located in a triangle, which forms the Kiev reservoir and the river Desna until it drops on the river Dnieper (Pasternak et al., 1980; Forestry, 2018; Yukhnovskyi, Urluk & Golovetsky, 2015).
The research was conducted during 2013-2017. The effectiveness of the organic fertilizer "Dostatok" of the formation of annual growth and survivability of pine seedlings was researched at the experiment.
At the experimental plots, the pills were inserted into the sword done by Kolesova slit on the upper part of the root system of seedlings. This pursued two interrelated goals - the accumulation, retention and gradual penetration of moisture down the root system for a long period with the simultaneous increase of soil fertility in the horizon of the root system development.
Experiments were carried out in 11 forest districts of the State Enterprise "Vyshcha-Dubechna Forestry" in pine sites. The plantations were created according to the following schemes: 4 rows of Scotch pine and 1 row of red oak with placement of seedlings in 1.5*0.5 m and 1.5*1.0 m by planting them in a furrows formed by a Forest Plow-Cultivator (FPK-70). Forest plantations with the use of fertilizers were planted at the 22.2 hectares.
Tablets "Dostatok" is a natural ecologically pure fertilizer with moisture-retaining properties on the basis of biohumus. Fertilizer contains agronomical useful microflora of natural origin. Usually the pills based on bio-humus "Dos-tatok" are intended for growing seedlings, and with addition of water are increased by 3.5 times and become an excellent loose foundation for germination of seeds and the formation of a powerful root system. The tablets provide the plant with all the necessary nutrients and develop in it the resistance to diseases. For industrial purposes the tablets are
available in a size of 16 mm in height and 30 mm in diameter. Unfortunately, in the instructions for the use of fertilizers, it does not indicate its acidity, the content of organic and mineral substances. It is only indicated that 50 % of the tablets "Dostatok" consist of organic ingredients and, unlike the Jiffy peat tablets, do not have a grid that holds peat.
Therefore, to determine the content of organic matter and the components of N, P, K and pH extract salt the samples of the fertilizer were tested in the certified Ukrainian Laboratory of Quality and Safety of Agricultural Products at the National University of Life and Environmental Sciences of Ukraine (test report No. 1240 dated 09.15.2017).
To determine the impact of fertilizer on the effectiveness of pine plantations, the samples of soil of the upper 10-cm horizon and the place of transition of litter to the soil in the fresh pine sites were chosen (protocols of tests No. 1725-N, 1729-N, 1727-N and 1733-N dated on November 20, 2017).
Determination of pH extract salt was carried out according to State Standard 27979-88 "Organic fertilizers. Method for determination of pH (Organic fertilizers: pH determination method) (State Standard 27979-88, 2006; State Standard 7949, 2015). Organic matter was determined according to State Standard 27980-88 "Organic fertilizers. Methods for determining the organic matter (Organic fertilizers, methods for the determination of organic matter) (State Standard 27980-88, 2006; State Standard 4289, 2004).
The total mass fraction of nitrogen was determined according to State Standard 7911:2015 "Organic and organic-mineral fertilizers. Method for determination the total mass fraction of nitrogen and mass fraction of ammoniac nitrogen" (State Standard 4729, 2007; State Standard 7911, 2015). Total phosphorus on the initial moisture was determined according to State Standard 26717-85 "Organic fertilizers. Methods for determination of total phosphorus (Organic fertilizers, methods for determination of total phosphorus)" (State Standard 26717-85, 2006; State Standard 4405, 2005). The mass fraction of total potassium was determined according to State Standard 7949:2015 "Organic fertilizers. Method for determination the mass fraction of total potassium" (State Standard 7949, 2015).
Results of the research and their discussion. Analysis of the quality of the organic layer of soil, which is the lower part of the forest litter at the stage of full mineralization, has been carried out to determine the effect of fertilizer on the growth of pine plantations on the soils of different mechanical composition. Samples of this layer were taken on sandy (A2) and sandy loam (B2) soils at depths of 1-2 and 1-3 cm, respectively. The comparative characteristic of the indicators of the quality of the organic layer of soil and the applied organic mineral fertilizer "Dostatok" is shown in the Table 1.
Data of the table 1 indicates that 40.6 % of organic matter is concentrated in the fertilizer, whereas in the organic layer of fresh poor and rich pine sites the content of humus is 22.2 % and 30.7 % respectively. At the same time, fertilizer is characterized by a neutral reaction and the organic soil of fresh poor and rich sites has a very high acid pH of the salt extract, which varies within 3.5-3.6. Almost double the predominance of the organic matter content in the fertilizer "Dostatok" contributes to the survival and growth of pine plantations.
Table 1. Indicators of quality of organic layer of soil and fertilizer
Name of indicators, units of measures Type of forest sites Fertilizer "Dosta-tok"
poor (A2) rich (B2)
pH extract salt, units pH 3.5±a30 3.6±030 5 4±°.30
Organic matter (humus), % 22.2±120 30.7±120 40.6±150
Total mass fraction of nitrogen, % of initial moisture 0.39±010 0.54±010 0.36±010
Mass fraction of ammonium nitrogen, % on the initial moisture 0.05±0001 0.15±005 0.3±005
Total phosphorus, % on the initial moisture 0.01±0005 0.08±001 0.2±005
Table 2. Indicators of soil quality of experimental pine plantations_
Type of forest sites
Name of indicators, units of measures fresh poor pine stand (A2) fresh rich pine stand (B2)
Depth of sample taking, cm
1-2 3-10 1-3 4-10
pH extract salt, units pH 3.3±015 3.5±015 3.2±015 3.1±015
Organic matter (humus), % 20.3±406 2 4±0.48 31.5±631 74±0.74
Ammonia nitrogen, mgKg-1 45.4±908 9.2±183 4 2±0.63 13.2±264
Nitrate nitrogen, mgKg-1 0.4±005 0.2±004 63.3±1262 0.9±013
Mobile phosphorus, mgKg-1 26.6±399 17.0±256 36.1±542 17 7±2.66
Nobile potassium, mgKg- 99.4±087 139.7±18 3 161.85±11. 23 46.39±0. 50
Type of soil sandy rough-dust sandy loam
Sand 1-0,05 mm, % 66.45 63.79
Rough dust 0,050,01 mm, % 25.13 26.37
Dust 0,010,001mm, % 7.37 8.26
Silt <0,001 mm, % 1.08 1.56
Physical clay <0,01 mm, % 9.87 11.20
An important factor in the survival and growth of seedlings is the content of nutrients in the active layer of soil. For this purpose, the quality indices of a 10-cm layer of soil were analyzed, which is shown in Table 2.
According to the results of the analysis of 10-cm soil layer, soil grouping was carried out on the fertility indices. Values of pH salt extraction indicate that the soils are very acid (3.5 and 3.1), with an average level of humus (2.4 and 7.4 %), low levels of ammonia and nitrate nitrogen and mobile phosphorus. Soil of fresh poor pine sites has an elevated level of mobile potassium (139.87 mg kg-1), while the fresh rich pine sites soil is characterized by a low level of potassium, which is 46.39 mg kg-1. Granulometric analysis of the soil showed that the poor sites are represented by sandy soils and rich sites - rough-dust sandy loam soils (State Standard 4730, 2007; ISO 10390, 2007).
The observation of experimental forest plantations was done by commissions consisting of a forestry engineer, a forester, a forestry assistant during September-October 2016-2017, as noted in the relevant forest survey documents. These researches are shown in Table 3.
Table 3. Survival and annual increment of pine plantation with the use of fertilizer and without fertilizer use
Type of forest site* Survival, % Annual increment, cm
Forest farm Block Area, ha using fertilizer without fertilizer use using fertilizer without fertilizer use
Gutiv 61/26 B2 2.0
62/12 B2 1.0
Total: 3.0 91 84 12±o 7±0.9
Desna 320/13 B2 1.0
332/27 B2 0.4
Total: 1.4 90 84 10±i.i 6±0-8
138/9 B2 0.6
Dovrobrodovsk 140/14 B2 0.9
135/25 C3 1.4
Total: 2.9 90 85 10±09 6±0.8
Dubechna 687/5 A2 0.5
713/4 B2 1.3
Total: 1.8 90 85 15±2'3 8±12
792/11 A2 0.4
Novosilky 793/9 A2 0.3
795/26 A2 0.3
Total: 1.0 89 86 10±15 7±1.0
Pirnovo 540/6 A2 2.3
488/7 A2 1.7
Total: 4.0 89 85 10±17 6±09
Prymorsk 347/4 A2 1.1 90 83 12±1'8 6±0'8
821/14 A2 0.7
Khotianivka 825/17 B2 0.4
856/10 A2 2.4
Total: 3.5 90 86 13«a 8±10
179/1 A2 0.8
Khutir 187/9 B2 0.2
182/3 B2 1.5
Total: 2.5 92 84 14±21 8±11
Tsenter 274/16 A2 1.0 88 84 12±1'9 7±0,8
Total 22.2
* Note: A2 - fresh poor pine site; B2 - fresh rich pine site; C3 - moisture pine-oak site.
Data of Table 3 indicates that the survival of experimental forest plantations with the use of fertilizer is varied within the range of 88-92 %, whereas in the control plantings this index is 83-86 %. At the same time, the annual increment of experimental plantations is recorded in the range of 10-15 cm, and in the control - 6-8 cm. The significant difference between the indices of survival and growth of pine seedlings was not detected.
Advantages of using tablets "Dostatok" are manifested in: high survival of forest plantations, accelerating the growth and development of Scotch pine plants, providing moisture to seedlings during the arid period.
Conclusions and perspectives. The results of researches testify to high efficiency of use of fertilizer "Dosta-tok" for creation of high productive forest plantations. The agrochemical analysis revealed that 40.6 % of organic matter was concentrated in the fertilizer, whereas in the organic layer of fresh poor pine and fresh rich pine sites the content of humus was 22.2 % and 30.7 % respectively. At the same time, fertilizers are characterized by a neutral reaction while the organic soil of fresh poor and rich pine sites have very high acidity of the pH of the salt extract, which fluctuates within 3.5-3.6.
The introduction on the root system of pine seedlings increases the survival of forest crops on sandy and sandy soils, which is 88 and 92 % respectively. The annual height increment of pine seedlings exceeded the control values by 4-7 cm.
The use of bio-fertilizer also reduces the amount of manual care and accelerates the closure in the rows, which in turn enables the transfer of forest crops to the forest-covered vegetation of the land a year earlier. It argues the perspective of use the fertilizer on sandy and sandy loam soils in the poor and rich fresh pine sites in the region.
Перелш використаних джерел
Danilenko, O. M., Tarnopilsky, P. B., Gladun, G. B., Gupal, V. V., Volkov, P. O., Kosatiy, D. M., & Samoilov, P. V. (2016). Use of "Roko-humin" for growing oak seedlings. Arboriculture and agroforestry, 129, 93-99. [In Ukrainian]. Forestry. (2018). The project of the organization and development of forestry of the State Enterprise "Vyshche-Dubechna Forestry". Irpin. Ukrlisproek. Vol. 1, Book. 1. 210 p.
Hrom, M. M. (2005). Simulation of the growth of forest crops of juvenile age by the introduction of mineral fertilizers in the West Forest-steppe. Scientific Bulletin of UNFU, 15(1), 29-34. [In Ukrainian].
ISO 10390:2007. Quality of soil. Determination of pH. [In Ukrainian].
Marchuk, I. U., Makarenko, V. M., Rostalnoi, V. Ye., Savchuk, A. V., & Filonov, E. A. (2010). Fertilizers and their use. Kyiv: Aristee. 253 p. [In Ukrainian].
Pasternak, P. S., Kiselevsky, R. G., Fedets, I. F., & Medvedev, L. A. (1980). Forestry zoning of the Ukrainian SSR. Forestry and agroforestry, 56, 3-16. [In Russian].
Pinchuk, A. P., & Hengalo, O. M. (2018). Efficiency of root-crops for increasing the productivity of accumulation of mass and elements of mineral nutrition by pine seedlings. Retrieved from: Ejournal.studnubip.com/zhurnal-8/ukr/. [In Ukrainian].
Sherstobaeva, E. (2003). Bio-preparations - a jump in resource-saving and ecologically safe agriculture. Agricultural machinery news, 1, 32. [In Ukrainian].
State Standard 26717-85. (2006). Organic fertilizers. Methods for determining of total phosphorus. [In Russian].
State Standard 27979-88. (2006). Organic fertilizers. Method for determination of pH. [In Russian].
State Standard 27980-88. (2006). Organic fertilizers. Methods for determination of organic matter. [In Russian].
State Standard 4289: 2004. Quality of soil. Methods of determination of organic matter. [In Ukrainian].
State Standard 4405:2005. Quality of soil. Determination of mobile compounds of phosphorus and potassium by methods of Kirsanov in the modification of the Soil Research Institute named after O. N. Sokolovsky. [In Ukrainian].
State Standard 4729:2007. Quality of soil. Determination of nitrate and ammonium nitrogen in the modification of the Soil Research Institute named after O. N. Sokolovsky. [In Ukrainian].
State Standard 4730:2007. Quality of soil. Determination of granulometric composition by the pipette method in the modification of N. A. Kachynskyi. [In Ukrainian].
State Standard 7911:2015. Organic and organic-mineral fertilizers. Method of determining the total mass fraction of nitrogen and the mass fraction of ammonia nitrogen. [In Ukrainian].
State Standard 7949: 2015. Organic fertilizers. Method of determining the mass fraction of total potassium. [In Ukrainian].
Yukhnovskyi, V. Yu., Urluk, Yu. S., & Golovetsky, M. P. (2015). Dynamics of the forest fund of the State Enterprise "Vysche-Dubecansky Forestry". Scientific Bulletin of UNFU, 25(8), 8-15. [In Ukrainian].
В. Ю. Юхновський1, Ю. С. Урлюк1, М. П. Головецький2,1. Л. Середа2
1 Нацюнальний утверситет бюресурав i природокористування Украши, м. Кшв, Украша 2 ДП "Вище-Дубечанське лкове господарство" Держлкагентства Украши, с. Шрново, Украша
ВПЛИВ ОРГАН1ЧНОГО ДОБРИВА "ДОСТАТОК" НА ПРИЖИВЛЮВАШСТЬ
I Р1СТ СОСНОВИХ КУЛЬТУР
Проаналiзовано приживлювашсть i picT соснових культур, створених на зрубах, з використанням оргашчного добрива "Достаток". Дослщження проведено в 11 люництвах ДП "Вище-Дубечанське лгсове господарство" в борових i суборових типах лгсорослинних умов. Культури створено за схемами: 4рСз1рДчр, з розмщенням аянщв 1,5x0,5 м та 1,5x1,0 м висаджу-ванням !х у борозни, утвореними плугом ПКЛ-70. Загальна площа створених люових культур i3 застосуванням добрива ста-новила 22,2 га. За результатами агpохiмiчного аналiзу встановлено, що у добpивi сконцентровано 40,6 % оргашчно! речови-ни, тодГ як в оргашчному шаpi Грунту cвiжого бору i субору вмют гумусу становить 22,2 i 30,7 % вГдповГдно. Водночас доб-риво характеризуемся нейтральним середовищем, а оргашчний Грунт cвiжого бору i субору мае дуже сильнокислий показ-ник рН сольово! витяжки, який змшюеться в межах 3,5-3,6. Подвшне переважання вмюту оргашчно! речовини у добpивi "Достаток" сприяе приживлюваност i росту соснових культур. Встановлено, що внесення добрива "Достаток" у виглядi таблеток на кореневу систему аянщв сосни шдвищуе приживлювашсть люових культур, яка на шщаних i сутщаних Грунтах вГдповГдно сягае 88 i 92 %. Рiчний прирют аянщв сосни звичайно! на 4-7 см перевищував контрольш показники. Викорис-тання бюпрепарату також зменшуе кшьюсть ручних доглядiв i пришвидшуе змикання в рядах, що дае змогу перевести люо-вi культури в покриту лгсовою рослиншстю площу на piк ранше.
Ключовi слова: елементи живлення; тип лгсорослинних умов; тщаний Грунт; аянець; коренева система; рГчний прирют.
В. Ю. Юхновский1, Ю. С. Урлюк1, М. П. Головецкий2, И. Л. Середа2
1 Национальный университет биоресурсов и природопользования Украины, г. Киев, Украина 2 ГП "Выше-Дубечанское лесное хозяйство"Гослесагентства Украины, с. Пирново, Украина
ВЛИЯНИЕ ОРГАНИЧЕСКОГО УДОБРЕНИЯ "ДОСТАТОК" НА ПРИЖИВАЕМОСТЬ И РОСТ СОСНОВЫХ КУЛЬТУР
Проанализированы приживаемость и рост сосновых культур, созданных на вырубках, с использованием органического удобрения "Достаток". Исследование проведено в 11 лесничествах ГП "Выше-Дубечанское лесное хозяйство" в боровых и суборевых типах лесорастительных условий. Культуры созданы по схемам: 4рС1рДкр, с размещением сеянцев 1,5x0,5 м и 1,5x1,0 м и высадкой их в борозды, образованными плугом ПКЛ-70. Общая площадь созданных лесных культур с применением удобрения составила 22,2 га. По результатам агрохимичесого анализа установлено, что в удобрении сконцентрировано 40,6 % органического вещества, тогда как в органическом слое почвы свежего бора и субора содержание гумуса составляет 22,2 и 30,7 % соответственно. Удобрение характеризуется нейтральной средой, тогда как органический слой почвы свежего бора и субора имеет очень сильнокислый показатель рН солевой вытяжки, который колеблется в пределах 3,5-3,6. Почти двойное преобладание содержания органического вещества в удобрении "Достаток" способствует приживаемости и росту сосновых культур. Установлено, что внесение удобрения "Достаток" в виде таблеток на корневую систему сеянцев сосны повышает приживаемость лесных культур, которая на песчаных и супесчаных почвах соответственно составляет 90 и 95 %. Годовой прирост сеянцев сосны обыкновенной на 4-7 см превышал контрольные показатели. Использование биопрепарата также уменьшает количество ручных уходов и ускоряет смыкания в рядах, что дает возможность перевести лесные культуры в покрытую лесом площадь годом ранее.
Ключевые слова элементы питания; тип лесорастительных условий; песчаная почва; сеянец; корневая система; годичный прирост.
