Tag Archives: peat

759-768 T. Albert, K. Karp, M. Starast and T. Paal
The effect of mulching and pruning on the vegetative growth and yield of the half-high blueberry
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The effect of mulching and pruning on the vegetative growth and yield of the half-high blueberry

T. Albert¹, K. Karp¹, M. Starast¹ and T. Paal²

¹Estonian University of Life Sciences, Institute of Agricultural and Environmental
Sciences , Kreutzwaldi 1A, 51014 Tartu, Estonia
²Estonian University of Life Sciences, Institute of Forestry and Rural Engineering,
Kreutzwaldi 1A, 51014 Tartu, Estonia, e- mail: tairi.albert@emu.ee

Abstract:

The aim of this research was to determine the influence of different mulches (peat, sawdust, plastic) and different pruning methods (moderate, severe) on the growth and yield of the half–high blueberry (Vaccinium corymbosum x Vaccinium angustifolium) ´Northblue´. The effect of a mixture of soil and peat was studied in the case of peat alone and peat and plastic mulches. The experiment was established in 1996 in South Estonia and in 2002 blueberry bushes were pruned. The results of the study showed that mulching significantly influenced nutrient content and pH. Depending on the mulch, the soil pH ranged from 4.5 to 6.1 – there was more acid soil in the peat treatment. The use of mulches had some influence on productivity of pruned half-high blueberry plants. When peat was applied a canopy of pruned plants recovered very well after one year. Within three years the plants had the same yield as un-pruned variants but four years after pruning the yield was highest in the variants where peat was applied. Plastic mulch is not suitable for blueberries: it decreases the yield and four years after pruning the normal plant growth in our study had not recovered. Severe pruning is more suitable for half-high blueberry fruiting plants in northern climate conditions.

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149-160 G. Sokolov L. Szajdak and I. Simakina
Changes in the structure of nitrogen-containing compounds of peat-, sapropel-, and brown coal-based organic fertilizers
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Changes in the structure of nitrogen-containing compounds of peat-, sapropel-, and brown coal-based organic fertilizers

G. Sokolov¹ L. Szajdak² and I. Simakina¹

¹Institute for Problems of Natural Resources Use and Ecology, National Academy of Sciencesof Belarus, Skarina str. 10, 220114 Minsk, Belarus; email: agrico@ns.ecology.ac.by
²Research Centre for Agricultural and Forest Environment of the Polish Academy of Sciences,ul. Bukowska 19, 60-809 Poznań; email: szajlech@man.poznan.pl.

Abstract:

The three-stage acidic hydrolysis method was used for the degradation of three organic fertilizers prepared on the basis of peat, sapropel and brown coal. This method of hydrolysis may simulate the processes that occur in the natural environment, influenced by chemical and biological factors with a high degree of reliability, by taking substances from fractions depending on stability of compounds in the investigated organic materials. The investigation of changes in the content of nitrogen in the studied fractions allows judging the character and the degree of transformation of nitrogen-containing compounds in kaustobioliths organic substances and prepared fertilizers. In these three organic fertilizers the content of readily (“easy”) hydrolysable nitrogen ranged from 49.1 to 58.4%, the content of hard-to- hydrolyse nitrogen ranged from 4.6 to 19.5%, in unhydrolysable rest, content ranged from 31.6 to 37%. The results showed a significant supply of nitrogen included in amino acid structures in soils. Amino acids represent a form of organic nitrogen, readily hydrolysable by chemicals and enzymes, available for plants and soil microorganisms. The highest supply was observed for the fertilizer prepared on the basis of brown coal. This fertilizer supplied 93.7 % more nitrogen than the reference soil. Two other fertilizers prepared on the basis of peat and sapropel supplied 64.1 % and 56.3 %, respectively more than reference soil. A relationship and good correlation were found between the contents of readily (“easy”) hydrolysable forms of nitrogen and the total amount of amino acids, and also between the contents of readily hydrolysable forms of nitrogen and concentrations of nitrogen in amino acid structures.

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