Báo cáo lâm nghiệp: "The use of silica sand in micropropagation of woods" pot

... was used in part as liquid with sand (25 cm 3 sand + 20 ml solution), in part reinforced by heating 6g of agar in a 1 l medium. Cultures were incubated for 6 weeks with a daily lighting period ... substances. White silica sand marked PR 21 from the sandpit Provodín near Česká Lípa (http://www.pisky.cz) was used in laboratories of the North-Bohemian Museum in Libere...

Ngày tải lên: 07/08/2014, 03:22

... reduction in hydraulic conductivity could occur. Work is continuing in order to evaluate the technique for assessing plant responses to drought in the field and as a means of measuring ... In: Water Flow in Plants. Longman, London Milburn J.A. & Johnson R.P.C. (1966) The conduction of sap. 11. Detection of vibrations produced by sap cav...

Ngày tải lên: 09/08/2014, 04:20

... efficiency of root system in terms of plant growth remains stable at least in that first growing period of plant in the forest disregarding their functions of conduction and embedding. CONCLUSIONS The ... explaining 92% of the relationship. An adequate proportion of fine roots (thinner than 2 mm) in the root system is another important parameter of planting stock and...

Ngày tải lên: 07/08/2014, 03:22

... may explain the relatively high losses due to cracks formed during drying (40% of the total drying losses). The clonal diff erences in veneer losses due to drying defects narrows the potential use of ... important feature in the industrial processing of poplar wood remains the occurrence of tension wood fibres and their distribution within the stem volume. The formation of tensi...

Ngày tải lên: 07/08/2014, 16:21

... ecosystems: assessment of the role of root pathogens and environmental constraints as interacting decline inducing factors”). REFERENCES [1] Aas G., Taxonomical impact of morphological variation in Quercus robur ... mm) LOBH: mean of the height of the six largest lobes (e.g. JM, mm) NIV: number of intercalary veins (veins irrigating a sinus) AURI: average angle of the two auri...

Ngày tải lên: 08/08/2014, 01:22

... 1986). possibly caused by interactions with other components present in crude dialyzed spruce extracts. In the presence of cyanide (20 pM NaCN), the inhibition of adrenochrome ... (not shown). This observation indicates that predominately Cu/Zn-containing SOD- species contributed to the activity deter- mined with the epinephrine assay. It has been...

Ngày tải lên: 09/08/2014, 04:20

... 25–30 29 e amount of precipitation in July was low and the effect of this fact we observed via continual dry- ing the trees in that time (with exception of several days in the mid of July when precipitation ... rearing. Laboratory rearing of I. typographus. e rear- ing cages were used for breeding of beetles on spruce bolts. Bolts were prepared from non-infested spruce...

Ngày tải lên: 07/08/2014, 03:22

... shortly prior to the beginning of rearing. Number and sex ratio of the F1 offspring were not identified in this study, because of the low number of emerged beetles in all treatments. ere were ... rearing of irradiated individuals, the rearing was done in large numbers of individuals and each dose was carried out in five replications. Ten irradi- ated or non-irradiated (c...

Ngày tải lên: 07/08/2014, 03:22

... the domination of Uropo- dina mites was increased and domination rate of Parasitidae mites was decreased. Similar results of the reaction of this group of mites to increas- ing amount of broadleaves ... starting of forest conversion was increasing number of species in the plots. On the plots with relatively close occurrence of beech, increasing number of specimens w...

Ngày tải lên: 07/08/2014, 03:22

... (5): 195–208 201 of potassium. In spite of the increasing values of available potassium in soil the present state of the sorption complex is more or less hazardous. It is in an environmentally ... content of humus substances its reserve is optimum also in intervening strips (Table 8). An increase after the windrow spreading is minimum and statistically insignificant wit...

Ngày tải lên: 07/08/2014, 03:22