Báo cáo lâm nghiệp: "Growth and nutrition of container-grown ponderosa pine seedlings with controlled-release fertilizer incorporated in the root plug" docx

... CONCLUSIONS Controlled-release fertilizer placed in the container at the time of sowing increased diameter, needle, stem and total bio- mass of ponderosa pine seedlings at lifting in the greenhouse. Seedlings with controlled-release ... investigate the applicability of a number of different controlled-release ferti- lizer products. The fertilizers wer...

Ngày tải lên: 08/08/2014, 01:22

... B. The concentration of K decreased with the addition of fertilizer (fig 2c). The K levels increased in 1995 in O and A and remained constant for the oth- ers. The highest ... measurement. The temperature varied from a minimum of 2 °C during the winter to a maximum of 45 °C in the summer. Being protected against rain fall,...

Ngày tải lên: 08/08/2014, 18:22

... lower after 30 days than in the leaves of plants left in the shade and in control seedlings growing in the gap. Photoinhibition in beech seedlings grown in the shade and transferred to full ... beech seedlings growing in the open area, higher values in the gap and the highest values in seedlings growing under shelterwood, ex- plained these d...

Ngày tải lên: 07/08/2014, 10:21

... diameter and diameter at half length (in cm respectively)) and the dry mass of the main stem (DM shoot ) at the end of the experiment, the dry mass of the main stem at the start of the experiment and ... selected according to the law on forest reproductive material. The seeds were sown into a permeable pot of 2000 cm 3 in size and the seedlings st...

Ngày tải lên: 08/08/2014, 01:21

... Growth and yield model for pine mixtures 15 increasing elevation increases the growth of a P. nigra tree. The signs of coefficients of the plot factor model of P. nigra were logical, bearing in mind ... G., Site index estimation in Scots pine (Pinus sylvestris L.) stands in the High Ebro Basin (northern Spain) using soil attributes, For. 74 (2001) 395–406. [3] Caja...

Ngày tải lên: 08/08/2014, 01:22

... capable of fixing the atmospheric nitrogen in root nodules, can guarantee nitrogen supply to the leguminous tree, making it independent of the nitrogen in the soil. The access of the roots to the ... month- old seedlings were transplanted in the field during the rainy season. To ensure the survival of the seedlings, irrigation with truck were pro- vi...

Ngày tải lên: 08/08/2014, 01:22

... dynamics of beech, mixed (fi r beech and spruce beech stands) and spruce stands, relict pine woods and stands in the ecotone of the upper forest limit in diff erent site, stand, air-pollution and ... in- dices used in the study. The horizontal structure of the forest stand was from the first year of ob- servation till 2010 random; in following years t...

Ngày tải lên: 07/08/2014, 10:21

... frame, the height of individuals in the main layer (they are not visibly dominant, nor are they suppressed) and finally the thickness of the root collar to the nearest 0.1 mm. In the case of “Telc” ... it was the height and thickness of the root collar of sample regenerated individuals selected from within the fencing and outside of it. e basic...

Ngày tải lên: 07/08/2014, 10:21

... the production and cost of other harvesting machines or systems used in the region and will be helpful for the loggers in selecting an appropriate system under certain stand and harvest circumstances. e ... using manual harvesting systems have been conducted in harvesting planted pine stands in the south. K-  and S (1994) conducted a time study on...

Ngày tải lên: 07/08/2014, 10:21

... depends on the other quantita- tive characteristics of fine roots, particularly on their length. With the increasing value of the fine root length the number of root tips increases as well. Therefore ... slightly with the soil depth (Table 4). These fi- nest roots bear a dominant amount of root tips and therefore the decrease in the root tip number wi...

Ngày tải lên: 07/08/2014, 10:22