Báo cáo lâm nghiệp: "in heating units pollination bags avoid damage to flowers by spring frost" ppt

... of spring frost sensitive tree species. Reçu le 4 novembre 1987. Accept! le 19 novembre 1987. Electric heating units in pollination bags avoid damage to flowers by spring ... heated bags, 70 p. 100 of the artificially pollinated flowers were still living. In conclusion, electric heating of pollination bags is a quick, cheap and e...

Ngày tải lên: 09/08/2014, 02:20

... 2009 (11): 526–531 JOURNAL OF FOREST SCIENCE, 55, 2009 (11): 526–531 Storage seed proteins have proved to be a useful tool to evaluate genetic variability in many species (G 1990), and have ... cotyledon) were un-lipped with diethyl ether and acetone. Cotyledon proteins were sequen- tially extracted according to the method described by F et al. (1997). Four fractions (alb...

Ngày tải lên: 07/08/2014, 10:22

... essentially provided by N depo- sition and soil N mineralization. Bacteria and fungi can trans- form organic N into ammonium (NH 4 ). Ammonium can be oxidized to nitrate (NO 3 ) by chemoautotrophic bacteria, ... sometimes found between gross nitrification rates measured by isotopic dilution of nitrate or by isotopic enrichment of nitrate can be explained by soil heterogeneities in...

Ngày tải lên: 07/08/2014, 16:20

... tied plastic bags in a refrigerator at 4 ± 1 ◦ C (in the dark) and stored for 0, 15, 30, 60, 90 or 120 days. The seed to air volume ratio was about 1:4. The bags were shaken once weekly to prevent ... chilling to re- lease dormancy before they can germinate [18], so the effect of priming might be expected to vary with dormancy intensity prior to priming. The objective of this stu...

Ngày tải lên: 07/08/2014, 16:21

... (7) P. tinctorius vegetative inoculum/NF, (8) P. tinctorius vegetative inoculum/SF, (9) P. tinctorius vegetative inoculum/SRF, (10) P. tinctorius spores inoculum/NF, (11) P. tinc- torius spores ... R.G., Role for the pho- tosynthate demand of ectomycorrhizas in response of Douglas-fir seedlings to drying soil, New Phytol. 117 (1991) 327–334. [13] Garbaye J., The role of ectomycorrhizal symbi...

Ngày tải lên: 07/08/2014, 16:21

... investigation was carried out to explore the mor- phogenic potential of Acacia mangium by using different com- binations of growth regulators. The nodal explants resumed new bud growth by proliferating the ... tropical countries of South East Asia, especially in acid and degraded soils, to which it can restore fertility owing to its natural nitrogen fixing ability. Besides, this tre...

Ngày tải lên: 08/08/2014, 01:21

... UK), placed 1.5 m above the top of the canopy. Heat storage into the canopy biomass was evaluated assuming that its temperature could be related to the temperature of the ... air temperature, respectively. Heat stored into the air was calculated as in Thom (1975). Soil heat flux was determined by measuring deep storage with heat flux plates (...

Ngày tải lên: 08/08/2014, 18:21

... other fundamental metabolic indicators; 2) re- cognition of the influence of polyamines on seed dormancy breaking as compared to the influence of growth regulators and modifiers of polyamine ... during dormancy breaking is similar to that of kinetin (A. platanoides) and GA (F excelsior), which makes it pos- sible to suggest a regulatory functio...

Ngày tải lên: 09/08/2014, 04:20

... is less inhibitory to root production than is BA. High concen- trations of BA, but not of K in combination with auxins, promote shoot proliferation probably by stimulating ... proliferation probably by stimulating axillary bud growth. Medium to high concentrations of auxin in combination with low to medium cytokinin concentrations promote shoot...

Ngày tải lên: 09/08/2014, 04:20

... (A!) and leaf conductance to C0 2 (g!) is de- scribed by a hyperbolic curve (Schulze and Hall, 1982; Kuppers. 1984), which may be reduced to both asymptotes (Per- eira et al., ... factors in photosyn- thesis. New Phytol. 72, 1089-1094 Kuppers M. (1984) Carbon relations and com- petition between woody species in a Central European hedgerow. II....

Ngày tải lên: 09/08/2014, 04:20