Сводный каталог книг

[Text] = Ett forsok att faststalla det optimala kvavetillstandet i gran under faltforhallanden : научное издание / C.O. Tamm. - Stockholm : Skogshogskolan, 1968. - 67 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; 61). - eng. - Библиогр.: с. 49. - 0.70 р., 0.15 р.

УДК

06

Аннотация: The nitrogen application increased growth. At first both height and diameter growth were affected. Later, the main growth increase was in diameter and volume growth. Also Pk application increased volume yield. Possible secondary effects of the fertilizer applications and the relationships between internal nutrient leveles and growth are discussed in some detail. The value of long-term optimum nutrition experiments in the future study of forest nutrition is pointed out

Экземпляры всего: 2
ИЛ-ИФ (2)
Свободны: ИЛ-ИФ (2)

[Text] = Variabiliteten i nagra av skogsmarkens agenskaper inom sma ytor och dess betydelse for mark-provtagningsmetodiken : научное издание / T. Troedsson, C.O. Tamm. - Stockholm : Skogshogskolan, 1969. - 30 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 74). - eng. - Библиогр.: с. 18. - 0.50 р.

УДК

06

Аннотация: The samples were analysed for N, P, K and loss on ignition, and the values obtained were expressed both as percentages and per unit area. The conclusion to be drawn from the results is to obtain good precision in analytical values, it is necessary to take a greater number of samples when the results are expressed in weight per unit area than when they are expressed in percentages by weight. As a rule, it is necessary to use samples from at least 10-15 points (Often more) - aggregated to a composite sample - to depress the coefficient of variation below 10 per cent for the values per unit area of the studied elements. The paper also contains tables showing the distributuin of these elements in the profiles examined


Доп.точки доступа:
Tamm, C.O.
Экземпляры всего: 1
ИЛ-ИФ (1)
Свободны: ИЛ-ИФ (1)

[Text] = Studier over kvavemobiliseringen i skogsjord : научное издание / C.O. Tamm, A. Pettersson. - Stockholm : Skogshogskolan, 1969. - 39 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 75). - eng. - Библиогр.: с. 25-26. - 0.50 р.

УДК

06

Аннотация: Incubation experiments were perfomed on samples from horizons of middle Swedish podzol profiles, stored under aerobic conditions at room temperature for up to two and a half years. More than one-third of the organic matter in the mor sample from a good site disapeared during two years' incubation at room temperture. Twenty-four to twenty-six per cent of its nitrogen content was simultaneously mineralised, the largest part as ammonia. The loss of organic matter was somewhat lower in samples from three poor sites (between 20 and 30 per cent) and the release of nitrogen was also lower (12 to 17 per cent). Both the breakdown and the release of nitrogen were generally decreased nitrogen lelease in mor samples (often to nil) but increased release in B horizon samples. Liming also increased nitrate formation


Доп.точки доступа:
Pettersson, A.
Экземпляры всего: 1
ИЛ-ИФ (1)
Свободны: ИЛ-ИФ (1)

[Text] = Intensiv kvavegodsling som stressfaktor i ett granskogsekosystem. I. Markreaktioner : научное издание / C.O. Tamm, B. Popovic. - Stockholm : Skogshogskolan, 1974. - 31 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 121). - eng. - Библиогр.: с. 30. - ISBN 91-38-02117-X : 0.50 р.

УДК

06

Аннотация: Soil studies were carried out before and after clear felling of an intensively fertilized young spruce plantation on old arable land. Particular attention was devoted to nitrogen mineralisation, nitrification, and leaching. Notable amounts of nitrate in the soil occurred before felling only on plots receiving high doses of ammonium nitrate, after clear felling also on some plots with no or low nitrogen supply. Marked quantities of nitrate nitrogen were observed in the deeper soil layers during fertilizer experiment in plots with high fertilizer additions. The soil reaction indicated an acidification as a result of fertilizer treatment. In a pot experiment with soil from the field experiment the nitrate leaching by percolation was studied.


Доп.точки доступа:
Popovic, B.
Экземпляры всего: 1
ИЛ-ИФ (1)
Свободны: ИЛ-ИФ (1)

[Text] = Inverkan av forband och godsling pa utvecklingen av tallympar av fyra olika kloner : научное издание / H.H. Hattemer, E. Andersson, C.O. Tamm. - Stockholm : Skogshogskolan, 1977. - 31 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 141). - eng. - Библиогр.: с. 31. - ISBN 91-38-03734-3 : 1.20 р.

УДК

06

Аннотация: An experiment was made with grafts of four different clones of Scots pine planted in 1963 in poor sandy soil, with two different spacings and with and without an annual supply of fertilizers from 1964 onwards. The nutrient status of the pines was followed by foliar analysis of needles sampled every autumn. Measurements of a great number of traits were made in 1967 and 1969 and subsequent statistical anlyses showed that both clones and treatment had significant effects on tree properties. Fertilizer strongly affected many properties, such as diameter, branch length, and diameter, cone setting and needle length.


Доп.точки доступа:
Andersson, E.; Tamm, C.O.
Экземпляры всего: 1
ИЛ-ИФ (1)
Свободны: ИЛ-ИФ (1)