scholarly journals Fertilization and Shading Trials to Promote Pinus nigra Seedlings’ Nursery Growth under the Climate Change Demands

2021 ◽  
Vol 13 (6) ◽  
pp. 3563
Author(s):  
Marianthi Tsakaldimi ◽  
Panagiota Giannaki ◽  
Vladan Ivetić ◽  
Nikoleta Kapsali ◽  
Petros Ganatsas
Keyword(s):  
Tree Species ◽  
Block Design ◽  
Pinus Nigra ◽  
Fertilization Rate ◽  
Early Growth ◽  
Climate Scenarios ◽  
Northern Greece ◽  
Randomized Block Design ◽  
Below Ground ◽  
High Fertilization

Pinus nigra is one of the most widely used tree species for reforestation within its geographical distribution, as well as being a potential substitute for other tree species in Central Europe under future climate scenarios. P. nigra is transplanted into the field as two-year or three-year old seedlings because of its relatively low growth rate in the nursery. This study investigated the effects of fertilization programs and shading on P. nigra seedlings, aiming to accelerate early growth, and thus to reduce the nursery rearing time. The experiment (a completely randomized block design) was conducted in an open-air nursery by sowing seeds from Grevena, Northern Greece, in Quick pots filled with peat and perlite in a 2:1 ratio. The seedlings were subjected to two levels of fertilization—5 and 10 g L−1 NPK (30-10-10)—and two shading levels: 50% and 70%. At the ends of the first and second nursery growing season, we recorded the seedlings’ above- and below-ground morphology and biomass data. The results show that the application of all of the treatments produced seedlings which met the targeted quality standards for outplanting. However, the combination of a high fertilization rate and low shading level resulted in seedlings of a higher morphological quality, which is often considered to be an indicator for a successful seedling establishment in the field.

scholarly journals Physiological Characteristics of Trees Recommended for the Phytoremediation of Soils Contaminated with Herbicides

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
L.M. AGUIAR ◽  
J.B. SANTOS ◽  
E.A. FERREIRA ◽  
C.M. CABRAL ◽  
I.M. PEREIRA ◽  
...  
Keyword(s):  
Weed Management ◽  
Tree Species ◽  
Production Systems ◽  
Block Design ◽  
Co2 Concentration ◽  
High Volume ◽  
Physiological Characteristics ◽  
Control Treatment ◽  
Randomized Block Design ◽  
Lower Variation

ABSTRACT: Herbicides are inputs with a high volume of use in agricultural production systems for weed management; however, the environmental contamination they cause is a reality. The objective of this research was to evaluate the tolerance of tree species used for the phytoremediation of herbicides in the soil, to atrazine, clomazone and 2,4-D, through the evaluation of photosynthetic indices. Thus, a randomized block design experiment was conducted with four replications, in a 4 x 5 factorial arrangement, where the first factor represented the herbicides atrazine, clomazone and 2,4-D and the control treatment without herbicide (water). The second factor consisted in the use of pre-selected tree species for the phytoremediation of soils with residues of the products [Eremanthus crotonoides DC. (candeia), - Richeria grandis Vahl (richeria), Protium heptaphyllum (Aubl) Marchand, (breu-branco) Kielmeyera latrophyton Saddi, Kew Bull, (pau-santo) Calophyllum brasiliense Cambess (guanandi)]. The herbicides were applied through dishes placed under the culture containers of the plants, when they presented eight months of development. After 15 days from the herbicide application, the visual intoxication, stomatal conductance (Gs), transpiration rate (E), CO2 concentration in the substomatal chamber (Ci), and water use efficiency (WUE) were evaluated. The herbicides affected differently the physiological characteristics of the tree species; atrazine was the most harmful product. Individuals under the effect of 2,4-D and clomazone presented lower variation for their physiological characteristics, compared to the respective control treatments. Breu-branco, despite showing low visual intoxication provided by the herbicides, was the most affected species by the products. On the other hand, candeia was the most tolerant species to the action of the herbicides.

scholarly journals Heavy Metal Retention by Different Forest Species Used for Restoration of Post-Mining Landscapes, N. Greece

2020 ◽  
Vol 12 (11) ◽  
pp. 4453
Author(s):  
Theano Samara ◽  
Ioannis Spanos ◽  
Panagiotis Platis ◽  
Thomas G. Papachristou
Keyword(s):  
Heavy Metal ◽  
Tree Species ◽  
Habitat Restoration ◽  
Robinia Pseudoacacia ◽  
Mining Area ◽  
Pinus Nigra ◽  
Forest Species ◽  
Northern Greece ◽  
Black Poplar ◽  
Metal Absorption

The main objective of this research was to study heavy metal absorption by the leaves of main forest species which were planted for that purpose at post-lignite mining landscapes in Northern Greece (Ptolemais, Prefecture of Kozani), as well as in a neighboring region (Kato Grammatiko), 30 km far from the mining area. Four species were studied; two conifers (Pinus nigra Arn., Cupressus arizonica Greene) and two broad-leaved (Robinia pseudoacacia L., Populus nigra L.). The four species varied in their leaf morphology (needles, scale-like leaves, blade, compound or simple, with rough or smooth surfaces). Eighty (80) leaf samples were collected, (10 from each tree species at either site). The heavy metal concentrations measured were iron (Fe), copper (Cu), chromium (Cr), nickel (Ni), cadmium (Cd), manganese (Mn), zinc (Zn) and cobalt (Co). Statistically significant differences (p = 0.01) were found between the lignite deposit and control areas and among the studied species. Higher concentrations were measured for the studied species at the lignite deposit. Moreover, no species demonstrated maximum absorption for all metals. The metal absorption pattern by coniferous trees’ leaves at the mining landscape was similar, with highest concentrations observed for iron and lowest for cobalt [iron (Fe) > zinc (Zn) > manganese (Mn) > copper (Cu) > chromium (Cr) > nickel (Ni) > cobalt (Co)]. Both broadleaved species absorbed highest concentrations of iron, but differed in the amount of the remaining metals [black locust: iron (Fe) > manganese (Mn) > zinc (Zn) > copper (Cu) > nickel (Ni) > chromium (Cr); black poplar: iron (Fe) > zinc (Zn) > manganese (Mn) > copper (Cu) > nickel (Ni) > chromium (Cr) > cobalt (Co)]. Cadmium was detected only in black poplar at both sites. In general, black pine was found to absorb the highest concentration of iron (Fe), and black poplar zinc (Zn). We discuss the importance of carefully selecting the appropriate mixture of tree species in order to achieve maximum habitat restoration effect at heavy metal polluted sites.

scholarly journals Eucalyptus growth in silvopastoral system under different crown dia meters

2013 ◽  
Vol 31 (4) ◽  
pp. 851-857 ◽  
Author(s):  
M.S. Machado ◽  
L.R. Ferreira ◽  
S.N. Oliveira Neto ◽  
H.M.F. Moraes ◽  
V.A. Gonçalves ◽  
...  
Keyword(s):  
Leaf Area ◽  
Block Design ◽  
Ground Level ◽  
Early Growth ◽  
Silvopastoral System ◽  
Lower Growth ◽  
Brachiaria Decumbens ◽  
Randomized Block Design ◽  
Hybrid Eucalyptus ◽  
Favorable Conditions

The aim of this study was to evaluate the effect of different crown diameters on the early growth of eucalyptus intercropped with Brachiaria decumbens in a silvopastoral system. The experiment was conducted in a B. decumbens established pasture, where hybrid eucalyptus urograndis (clone GG100) was planted, spaced 8 x 3 m. A randomized block design was used, with six replicates. Treatments consisted of five crown diameters (0.0, 1.0, 1.5, 2.0, and 3.0 m) surrounding the eucalyptus plants. Five weeding hoes were performed throughout the experiment, according to the different crown diameters, aiming to maintain the eucalyptus plants free from B. decumbens interference. At 90, 180, 270, and 360 DAP, the height and the diameter of the eucalyptus plants were evaluated, and at 360 DAP, surface biomass and leaf area were evaluated. At 90 DAP, it was verified that the non-weeded plants had lower growth, compared to those submitted to crowns. Crown diameters of 2.51 and 2.64 m allowed greater growth in height and diameter at ground level of eucalyptus plants, respectively, in all periods evaluated. Biomass production and leaf area per plant at 360 DAP were also influenced by the different crown diameters. It was concluded that crown diameter around 2 meters provided favorable conditions for early growth of eucalyptus and less involvement in the area occupied by forage.

scholarly journals Effect of Nitrogen and Potassium Rates on Early Development of Macaw Palm

2015 ◽  
Vol 39 (6) ◽  
pp. 1671-1680 ◽  
Author(s):  
Leonardo Duarte Pimentel ◽  
Claudio Horst Bruckner ◽  
Hermínia Emília Prieto Martinez ◽  
Sérgio Yoshimitsu Motoike ◽  
Candida Elisa Manfio ◽  
...  
Keyword(s):  
Block Design ◽  
Nutrient Use Efficiency ◽  
Fertilization Rate ◽  
Vegetative Development ◽  
Nutrient Contents ◽  
Economic Exploitation ◽  
Randomized Block Design ◽  
Nutrient Use ◽  
Leaf Tissues ◽  
Macaw Palm

ABSTRACT The economic exploitation of macaw palm [Acrocomia aculeate(Jacq.) Lodd. ex Mart.] is currently in transition, from extractivism to agricultural cultivation, thus requiring studies on the fertilization of the crop. This study evaluated the response of three genotypes of macaw palm to increasing rates of nitrogen and potassium, grown in the field until the 2nd year and to establish reference contents of mineral nutrients in the leaf. The experiment was a split-plot randomized block design with five main treatments (N and K rates) and three secondary treatments (genotypes), with three replications, each plot containing three plants. Plant height, leaf number, vigor, and nutrient contents in leaf tissues were evaluated at the end of 2nd year of cultivation. Differential responses were observed among genotypes, indicating that some genotypes are more efficient in the use of mineral inputs. There was a differentiated and positive response to increasing side-dressed N and K rates in the vegetative development of macaw genotypes until the 2nd year of field cultivation, indicating variability in the species in terms of nutrient use efficiency. The N and K fertilization rate corresponding to 360 g N + 480 g K2O per plant, in four split applications over the two years of cultivation, was insufficient to induce maximum vegetative development in the three macaw genotypes. There was no variation in macro- and micronutrient contents in leaf dry matter of the three macaw genotypes.

scholarly journals Nitrogen and Phosphate Fertilization Maximize Grass BRS Zuri Performance

2020 ◽  
Vol 8 (1) ◽  
pp. 64
Author(s):  
Sebastião Soares De Oliveira Neto ◽  
Ana Stella Freire Gonçalves ◽  
Rita Therezinha Rolim Pietramale ◽  
Mário José Bellíssimo
Keyword(s):  
Experimental Design ◽  
Ammonium Nitrate ◽  
Dry Matter ◽  
Block Design ◽  
Fertilization Rate ◽  
Forage Yield ◽  
Panicum Maximum ◽  
Dry Matter Yield ◽  
Randomized Block Design ◽  
Phosphate Fertilization

The low nutrients levels available in pasture formation reduces the forage yield. Soil correction and fertilization practices are considered priorities in the planning, renovation or recovery of pastures. The aimed of this experiment was to evaluate the effect of nitrogen and phosphate fertilization rate in productivity of the Panicum maximum cv. BRS Zuri. The experimental design was a randomized block design in a 3×4 factorial arrangement, with three doses of superphosphate (0.0, 80.0 and 160.0 kg.ha-1) and four doses of ammonium nitrate (0.0; 20.0; 40.0 and 60.0 kg.ha-1), with three replicates. The following parameters were evaluated at 120 days after implantation: green mass and dry matter yield, plant height, number of plants and tillers per square meter. The doses of 80.0 and 160.0 kg.ha-1 of P2O5 and 60.0 kg.ha-1 of nitrogen combined to each other showed the best results for forage yield.

scholarly journals Effects of Leaf Loss by Artificial Defoliation on the Growth of Different Poplar and Willow Varieties

Forests ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1224
Author(s):  
Christiane E. Helbig ◽  
Michael G. Müller ◽  
Dirk Landgraf
Keyword(s):  
Plant Growth ◽  
Tree Species ◽  
Block Design ◽  
Economic Losses ◽  
Negative Effects ◽  
Annual Increment ◽  
Local Conditions ◽  
Growing Seasons ◽  
Short Rotation ◽  
Randomized Block Design

The cultivation of fast-growing tree species in short rotation coppices has gained popularity in Germany in recent years. The resilience of these coppices to phyllophagous pest organisms is crucial for their profitable management, since the loss of a single annual increment can lead to uncompensable economic losses. To study the effects of leaf loss on the growth of poplar and willow varieties that are frequently cultivated under local conditions, three sample short rotation coppices including five poplar (Populus spp.) and three willow (Salix spp.) varieties were established in a randomized block design with four artificial defoliation variants and, on one site, with three different variants regarding the number of defoliation treatments. After up to three defoliation treatments within two growing seasons, the results show negative effects of leaf loss on the height growth and the fresh weight of the aboveground biomass of plants. Our data also suggests a lasting effect of defoliation on plant growth and re-growth after the end of the treatment. In general, defoliation had a greater impact on the growth of poplars than on willows. We conclude that even minor leaf loss can have an impact on plant growth but that the actual effects of defoliation clearly depend on the site, tree species, and variety as well as the extent and number of defoliations, which determine the ability of plants for compensatory growth.

scholarly journals Water use in the growth of atlantic forest tree species seedlings under different shading levels

2021 ◽  
Vol 45 ◽  
Author(s):  
Mateus Marques Bueno ◽  
Paulo Sérgio Santos Leles ◽  
Marinaldo Ferreira Pinto ◽  
Alexander Silva de Resende ◽  
Beatriz Rodrigues Monteiro Couto ◽  
...  
Keyword(s):  
Water Use ◽  
Tree Species ◽  
Block Design ◽  
Water Productivity ◽  
Forest Tree ◽  
Hymenaea Courbaril ◽  
Light Levels ◽  
Randomized Block Design ◽  
Light Requirements ◽  
And Control

ABSTRACT The increase in the demand for seedlings of native tree species makes it important to determine their water and light requirements, which are important factors in their production, in terms of costs and time. Water use and productivity in the growth of seedlings of Dalbergia nigra (Vell.) Allemão ex Benth., Apuleia leiocarpa (Vogel) J.F. Macbr and Hymenaea courbaril L. were determined under four light levels (three shading levels and control), using a randomized block design with four replicates. Height, stem diameter, leaf area and biomass, as well as Dickson quality index (DQI) were evaluated. The seedlings were transplanted into 280-cm3 plugs, filled with substrate composed of pure biosolids, and irrigated by a drip system with automatic management. The highest total volumes applied were 3.1 L per D. nigra seedling (in 37 and 58% shading), 2.5 L per A. leiocarpa seedling (in 37% shading) and 3.8 L per H. courbaril seedling (in full sun). Growth indices, confirmed by the DQI, indicate that shading levels of 37 and 58% for D. nigra, 37% for A. leiocarpa, and full sun for H. courbaril are the most recommended. The highest volumes of irrigation promoted the greatest development of the species, in general for intermediate shading, which provided the highest values of DQI and irrigation water productivity.

scholarly journals Short Communication: Abundance of corn planthopper (Stenocranus pacificus Kirkaldy 1907, Hemiptera: Delphacidae) on five new corn varieties

2018 ◽  
Vol 19 (3) ◽  
pp. 1029-1034
Author(s):  
MY SYAHRAWATI ◽  
NOVRI NELLY ◽  
HASMIANDY HAMID ◽  
SISKA EFENDI
Keyword(s):  
Short Communication ◽  
Block Design ◽  
Early Growth ◽  
Leaf Length ◽  
Physical Factors ◽  
Randomized Block Design ◽  
Corn Planthopper ◽  
West Sumatra ◽  
Generative Phase ◽  
Level Of Significance

Syahrawati M, Nelly N, Hamid H, Efendi S. 2018. Short Communication: Abundance of corn planthopper (Stenocranus pacificus Kirkaldy 1907, Hemiptera: Delphacidae) on five new corn varieties. Biodiversitas 19: 1029-1034. Both local and hybrid corn varieties have been attacked by Stenocranus pacificus or corn planthopper frequently grown in West Sumatra. So, the basic aim of the study is to know about the abundance of S. pacificus on major five corn varieties that will be intermittently released viz., N35, N37, NT10, NT104, and NT105. The study was conducted around palm plantation in Dharmasraya District using Randomized Block Design in 5 replications. The observations were made at weekly intervals throughout the season after planting up to 8 weeks. Number of S. pacificus were collected from 16 hills by using simple aspirator, selected randomly from each unit. The measurement of leaf length, leaf width, stem diameter and trichome length were also performed to confirm the physical effect of S. pacificus preferences. LSD test at 5% level of significance was done to determine the influence of different varieties on insect population. The S. pacificus preferably effect to NT10 variety as compared to other varieties from the early growth of corn, but the S. pacificus abundance was higher at the generative phase than the vegetative. There was a very rapid increase in its population from week to week. Physical factors of the plant, as like as trichome, affected the insect abundance.

scholarly journals Identifikasi Pengaruh Dosis Pemupukan Trichokompos terhadap Fase Awal Pertumbuhan Tanaman Jagung Ungu Antioksidan (Identification of the Trichocompost Fertilizer Dose Effect on the Early Growth of Purple Corn Anthocyanins)

JURNAL PANGAN ◽  
2021 ◽  
Vol 29 (3) ◽  
pp. 191-196
Author(s):  
Andi Ayu Nurnawati
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Plant Height ◽  
Block Design ◽  
Early Growth ◽  
Dose Effect ◽  
Randomized Block Design ◽  
Number Of Leaves ◽  
Purple Corn ◽  
Corn Plants

ABSTRAK Jagung ungu merupakan salah satu dari beberapa varian warna jagung pulut yang belum begitu dikenal oleh masyarakat namun kaya akan manfaat. Penilitian ini bertujuan untuk mengetahui pengaruh dosis pupuk trichokompos terhadap variabel pengamatan diantaranya persentase tumbuh tanaman, tinggi tanaman, jumlah daun dan luas daun pada fase awal pertumbuhan tanaman jagung ungu. Persentase tumbuh tanaman diamati pada 7 hari setelah tanam kemudian tinggi tanaman, jumlah daun dan luas daun diamati pada 14 hari setelah tanam. Metode penelitian menggunakan Rancangan Acak Kelompok dengan 5 perlakuan dosis pupuk trichokompos (0 ton/ha, 20 ton/ha, 25 ton/ha, 30 ton/ha dan 35 ton/ha) yang diulang sebanyak 5 kali. Analisis data menggunakan sidik ragam dan dilanjutkan dengan uji BNJ (Uji Lanjut Tukey), apabila diperoleh hasil yang berpengaruh beda nyata pada perlakuan yang diujikan. Hasil penelitian menunjukkan bahwa perlakuan dosis pupuk trichokompos berpengaruh nyata pada variabel pengamatan jumlah daun di mana dosis pupuk trichokompos 25 ton/ha menunjukkan nilai tertinggi. kata kunci: jagung ungu, trichokompos, pertumbuhan awal ABSTRACT Purple corn is one of several colour variants of pulut corn that is not well known by the public but it has many benefits. This study was aimed to determine the effect of trichocompost fertilizer dosage on the observed variables, that were the percentage of plant growth, plant height, number of leaves, and leaf area in the early stages of purple corn plants' growth. Percentage of plant growth at 7 days after planting then plant height, number of leaves and leaf area were observed at 14 days after planting. The research method used a randomized block design with 5 doses of trichocompost fertilizer (0 tons/ha, 20 tons/ha, 25 tons/ha, 30 tons/ha, and 35 tons/ha) with five replications. The results showed that the dosage treatment of trichocompost had a significant effect (p<0.05) on the number of leaves where the trichocompost fertilizer dose of 25 tons/ha  showed the highest one. keywords: purple corn, trichocompost, early growth.

scholarly journals INTERCROPPING CORN WITH A COMBINATION OF TREE SPECIES TO CONTROL WEEDS

2015 ◽  
Vol 33 (4) ◽  
pp. 717-726
Author(s):  
P.S.L. SILVA ◽  
E.M. SILVA ◽  
P.I.B. SILVA ◽  
J.P.P. FERNANDES ◽  
L.S. CHICAS
Keyword(s):  
Weed Control ◽  
Tree Species ◽  
Crop Residues ◽  
Block Design ◽  
Corn Yield ◽  
Weed Growth ◽  
Randomized Block Design ◽  
Viable Seeds ◽  
C 30

ABSTRACT The combination of crop residues or crop extracts is often more advantageous in controlling weeds, than the application of each residue or extract singly. This suggests that in intercropping with maize, the combination of tree species can be more advantageous than species isolated in weed control. The objective of this study was to evaluate the effects of intercropping with a combination of leguminous on the weed growth and corn yield. A randomized-block design with split plots (cultivars in plots) and five replicates was established. The cultivars BR 205 and AG 1041 were subject to the following treatments: two weedings (A), intercropping with sabiá (B), gliricidia (C), gliricidia + sabiá (D) and no weeding (E). In the B and C, 30 viable seeds m-2 of the leguminous were sown. In the D, 15 seeds of each species were sown m-2. The legumes were sown by random casting during corn planting. The sequence of the best treatments in reducing the growth of weeds is A > B = C = D = E. The sequence of the best treatments when are considered the yields of baby corn, green corn and grain is A > B > C > D > E. The cultivars do not differ in regards to the reduction in weed growth. In terms of corn yield cultivar BR 205 is the best.

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