scholarly journals Effect of plant bio-regulators on photosynthesis, growth and yield efficiency of pear trained on Y-trellis system

2021 ◽  
Vol 22 (2) ◽  
pp. 140-147
Author(s):  
SHUBHKIRAN KAUR ◽  
MANDEEP SINGH GILL ◽  
P.P.S. GILL ◽  
NAV PREM SINGH
Keyword(s):  
Vegetative Growth ◽  
Growth Management ◽  
Training System ◽  
Growth And Yield ◽  
Strong Positive Correlation ◽  
Light Penetration ◽  
Cross Sectional ◽  
Area Index ◽  
Yield Efficiency ◽  
Prohexadione Calcium

‘Patharnakh’ and ‘Punjab Beauty’ are major pear cultivars grown under the subtropical conditions of northwestern India. These pear cultivars tend to put up profuse vegetative growth under the high density planting that leads to excessive shading of bearing zone of canopy. To facilitate light penetration into inner plant canopy, there is a need to contrive an efficient approach for vegetative growth management. The foliar applications of varying concentrations of plant bio-regulators viz. Prohexadione calcium (Pro-Ca) (100, 200, 400 mg L-1) and Paclobutrazol (PBZ) (100, 250, 500 mg L-1) were done at 10 days after full bloom (DAFB) ‘Patharnakh’ and ‘Punjab Beauty’ pear plants trained on the Y-trellis training system. Shoot length, leaf area index and trunk cross-sectional areas (TCSA) were greatly reduced by Pro-Ca200 and 400 mg L-1 concentrations. Treatments enhanced light penetration and photosynthesis. Fruit weight improved with plant bio-regulator treatments resulting in increased yield efficiency of pear plants. This study exhibited a strong positive correlation between light availability and yield efficiency of pear plants.

scholarly journals Mode of Action, Metabolism, and Uptake of BAS-125W, Prohexadione Calcium

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 558A-558 ◽  
Author(s):  
J.R. Evans ◽  
C.A. Ishida ◽  
C.L. Regusci ◽  
R.R. Evans ◽  
W. Rademacher
Keyword(s):  
Growth Regulator ◽  
Vegetative Growth ◽  
Growth Management ◽  
Management Strategies ◽  
The United States ◽  
Training System ◽  
Effective Control ◽  
Negative Effects ◽  
Flexible Tool ◽  
Prohexadione Calcium

Prohexadione calcium, or BAS-125W, is a plant growth regulator being developed for registration in the United States by the BASF Corporation and Kumiai Chemical Industry Co. Ltd. Prohexadione calcium inhibits the biosynthesis of gibberellin by blocking dioxygenases, which require 2-oxogluterate as a co-substrate. The result is a decrease in cell elongation and reduced vegetative growth. Gibberellin levels are reduced in the plant for 3 to 4 weeks following application of this growth regulator. Prohexadione calcium does not persist in the plant or directly effect vegetative growth the following season. Prohexadione calcium is absorbed by the plant foliage and uptake is generally complete within 8 hr following application. Results indicate that translocation within the plant is predominantly by acropetal movement, while basipetal movement is limited. Preliminary research has shown prohexadione calcium to have a short half-life in the environment; to have no negative effects on non-target organisms; and to offer little risk to users or consumers. Rates of 125 ppm a.i. to 250 ppm a.i. have typically provided effective vegetative control of vigorous apple trees. Generally, as the vegetative vigor of a tree increases; the rate of prohexadione calcium needed for effective vegetative control has to be raised. Vegetative vigor is influence by numerous factors including: fruit load, location, variety, rootstock, age, pruning, and training system. Earlier applications at 2 to 5 inches of new shoot growth have provided more-effective control of vegetative growth than later applications. Due to its short-term effect and lack of persistence, prohexadione calcium can be a flexible tool in developing user specific growth management strategies.

Performance of prohexadione-calcium on shoot growth and fruit quality of apple — Effect of spray surfactants

2008 ◽  
Vol 88 (1) ◽  
pp. 165-174 ◽  
Author(s):  
J. A. Cline ◽  
C. G. Embree ◽  
J. Hebb ◽  
D. S. Nichols
Keyword(s):  
Vegetative Growth ◽  
Shoot Growth ◽  
Management Practice ◽  
Fruit Size ◽  
Growth Control ◽  
Growth And Yield ◽  
Control Treatment ◽  
Royal Court ◽  
The Us ◽  
Prohexadione Calcium

Vegetative growth control of apples (Malus × domestica Borkh.) is necessary to maintain a balance between growth and cropping. Pruning is a labour-intensive management practice to achieve this and intrinsically stimulates new growth. Prohexadione-calcium (PC) is a plant bio-regulator that effectively regulat es the shoot extension growth of apples and other tree fruits. Previous research has demonstrated that its efficacy can vary based on the use of spray surfactants and adjuvants. This study investigated the efficacy of two rates of Apogee™, the commercial form of PC, used in combination with the spray surfactants Sylgard 309 and LI 700, on extension shoot growth and yield parameters. Experiments were conducted in Ontario on Empire and Nova Scotia on Royal Court™ Cortland apples. Treatments of 0, 75 or 125 mg L-1 PC, with and without either 0.5% (vol/vol.) LI 700 surfactant or 0.05% (vol/vol) Sylgard 309 surfactant were applied to Empire trees, and 75 or 125 mg L-1 PC, with or without 0.5% (vol/vol) LI 700, were applied to Royal Court™ trees. An untreated control treatment was also included for comparison purposes. A total of two sprays were applied to the Empire trees and a total of three sprays were applied to the Royal Court™ trees. PC significantly decreased the vegetative growth of Empire and Royal Court™ trees by approximately 18 to 44%, respectively, and the efficacy of PC was enhanced when combined with either Sylgard 309 or LI 700 surfactant. No additional benefit in vegetative growth control was gained when using Apogee™ at rates of 125 mg L-1 PC, relative to 75 mg L-1 PC. The rate of Apogee™ did not influence the number of fruit or yield per tree or mean fruit size of either cultivar. For Empire, LI 700 and Sylgard 309 significantly reduced the number of fruit per tree, resulting in lower yields and crop densities. In addition, higher mean fruit weights, and a greater distribution of fruit in the larger size categories were observed for LI 700. Fruit from Royal Court trees treated with the highest rate of Apogee™ had higher crop densities, poorer coloured fruit, and a higher percentage of fruit less than 60 mm in diameter. These data provide support for the use of alternative surfactants with Apogee™ other than those listed on the US and Canadian product labels. Key words: Apogee™, Empire, Cortland, Regalis, calcium 3-oxido-5-oxo-4-propionylcyclohex-3-enecarboxylate, surfactant

scholarly journals Growth dynamics and yield of melon as influenced by nitrogen fertilizer

2011 ◽  
Vol 68 (2) ◽  
pp. 191-199 ◽  
Author(s):  
María Teresa Castellanos ◽  
María Jesús Cabello ◽  
María del Carmen Cartagena ◽  
Ana María Tarquis ◽  
Augusto Arce ◽  
...  
Keyword(s):  
Leaf Area ◽  
Vegetative Growth ◽  
Dry Matter ◽  
Weight Ratio ◽  
Growth Dynamics ◽  
Dry Weight ◽  
N Fertilization ◽  
Fruit Yield ◽  
Growth And Yield ◽  
Area Index

Nitrogen (N) is an important nutrient for melon (Cucumis melo L.) production. However there is scanty information about the amount necessary to maintain an appropriate balance between growth and yield. Melon vegetative organs must develop sufficiently to intercept light and accumulate water and nutrients but it is also important to obtain a large reproductive-vegetative dry weight ratio to maximize the fruit yield. We evaluated the influence of different N amounts on the growth, production of dry matter and fruit yield of a melon 'Piel de sapo' type. A three-year field experiment was carried out from May to September. Melons were subjected to an irrigation depth of 100% crop evapotranspiration and to 11 N fertilization rates, ranging 11 to 393 kg ha-1 in the three years. The dry matter production of leaves and stems increased as the N amount increased. The dry matter of the whole plant was affected similarly, while the fruit dry matter decreased as the N amount was increased above 112, 93 and 95 kg ha-1, in 2005, 2006 and 2007, respectively. The maximum Leaf Area Index (LAI), 3.1, was obtained at 393 kg ha-1 of N. The lowest N supply reduced the fruit yield by 21%, while the highest increased the vegetative growth, LAI and Leaf Area Duration (LAD), but reduced yield by 24% relative to the N93 treatment. Excessive applications of N increase vegetative growth at the expense of reproductive growth. For this melon type, rates about 90-100 kg ha-1 of N are sufficient for adequate plant growth, development and maximum production. To obtain fruit yield close to the maximum, the leaf N concentration at the end of the crop cycle should be higher than 19.5 g kg-1.

scholarly journals ANALYSIS OF POTENTIAL AND STABILITY ACROSS ENVIRONMENTS OF NINE APPLE ROOTSTOCKS IN THEIR INFLUENCE ON GROWTH AND YIELD

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1173f-1173
Author(s):  
William C. Olien ◽  
David C. Ferree ◽  
Bert L. Bishop
Keyword(s):  
High Stability ◽  
High Potential ◽  
Environmental Stability ◽  
Growth And Yield ◽  
Apple Rootstocks ◽  
Cumulative Yield ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Regional Project ◽  
A Site

Nine apple rootstocks grafted with `Starkspur Supreme Delicious' were evaluated in 19 states over 9 to 10 years by the NC 140 Regional Project as a randomized complete block with 10 replications in each site. Effects on trunk cross-sectional area (TA), cumulative yield per tree (Yc), and cumulative yield efficiency (YEc=Yc/TA) were evaluated. Rootstock differences in mean potential (mean performance at the mean site) and environmental stability (slope across sites) were compared by analysis of rootstock performance within a site linearly regressed on mean performance of all rootstock in that site. MAC 24 had the highest mean potential of Yc and TA with lowest stability, giving this rootstock the highest Yc and TA in best sites, and lowest in poor sites. M.27 EMLA was the opposite, having low potential and high stability in Yc and TA. In YEc, M.27 EMLA and MAC9 had high potential and low stability, while OAR1, M.7 EMLA, and especially MAC 24 were the opposite. YEc of Ott.3 and M.26 were average in both respects. M.9 had high potential YEc with average stability. M.9 EMLA was unique in having both high potential and high stability of YEc.

scholarly journals Effect of 'Gutingen V' as an intensive training system on agromorphological characters of some apple cultivars in Karaj region of Iran

Genetika ◽  
2010 ◽  
Vol 42 (2) ◽  
pp. 331-338 ◽  
Author(s):  
Ahmad Dadashpour ◽  
Alireza Talaei ◽  
Ali Shahi-Gharahlar
Keyword(s):  
Irrigation System ◽  
Tree Height ◽  
Fruit Trees ◽  
Climatic Conditions ◽  
Training System ◽  
Research Station ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Intensive Training ◽  
Apple Cultivars

V-shape systems represent an efficient and popular option to increase yields and fruit quality in fruit trees. Hence, this paper attempts to compare some vegetative and yield characteristics of five apple cultivars grown at horticultural research station in Karaj, Iran. The selected apple cultivars were included: 'Golab-kohans' (Iranian cultivar), 'Fuji', 'Gala', 'Starking' and 'Delbar estival' (commercial foreign cultivars) that were grafted on M.9 rootstock which were trained in a V system. All of these trees were planted in winter 2005. The time of irrigation started from the second experimental year after planting and the method of irrigation was drip irrigation system. Results showed that the 'Golab-kohans' had the most tree height (278.63 cm), trunk cross sectional area (7.308 cm2) and mean shoot length (100.58 cm). Also 'Delbar estival' had the most yield (0.98 kg), yield efficiency (0.550 kg/cm2). Consistently, Results revealed that among the investigated cultivars, 'Delbar estival' can be introduced as a prone and productive cultivar for V system in Karaj's climatic conditions.

Cumulative Yield, Tree Growth, and Yield Efficiency of 18 Asian Pear Cultivars

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 463f-464
Author(s):  
Fenton E Larsen ◽  
Stewart S. Higgins
Keyword(s):  
Research Unit ◽  
Washington State ◽  
Growth And Yield ◽  
Sectional Area ◽  
Cumulative Yield ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Asian Pear ◽  
Large Trees ◽  
High Yields

Eighteen Asian pear cultivars on Pyrus betulaefolia rootstocks were planted in 1990 at Washington State University's Royal Slope Research Unit in central Washington State. Annual trunk diameters have been measured since planting, and annual harvest records have been kept since 1995. The six cultivars with the largest trees, ranked in decreasing order of trunk cross-sectional area, were `Daisui Li' (144 cm2), `Ishiiwase', `Huhoot Li', `Shin Li', `Shinsui', and `Yoinashi' (123 cm2). The six cultivars with the smallest trees were `Twentieth Century' (91 cm2), `Chojuro', `Shinseiki', `Shinko', `Yakumo', and `Tarusa Crimson' (38 cm2). `Tarusa Crimson' was significantly smaller than all other cultivars. The six highest-yielding cultivars, ranked in decreasing order of cumulative yield, were `Daisui Li' (183 kg/tree), `Shinseiki', `Shin Li', `Shinko', `Chojuro,' and `Olympic' (107 kg/tree). `Daisui Li' had significantly higher cumulative yield than all other cultivars. The six lowest-yielding cultivars were `Yoinashi' (71 kg/tree), `Huhoot Li', `Tarusa Crimson', `Yakumo', `Shinsui', and `Nangon Li' (19 kg/tree). The six highest-ranking cultivars for cumulative yield efficiency were `Shinseiki' (1.6 kg·cm–2), `Shinko', `Chojuro', `Daisui Li', `Tarusa Crimson', and `Olympic' (1.2 kg·cm–2). The six least-efficient cultivars were `Ishiiwase' (0.7 kg·cm–2), `Yakumo', `Yoinashi', `Huhoot Li', `Shinsui', and `Nangon Li' (0.2 kg·cm–2). `Daisui Li' and `Tarusa Crimson' had similar, relatively high, cumulative yield efficiencies, but for different reasons. `Daisui Li' produced high yields on large trees while `Tarusa Crimson' produced low yields on small trees. In contrast, the relatively high efficiencies of `Shinseiki', `Shinko' and `Chojuro' resulted from high yields produced on small trees.

scholarly journals Vegetative growth and yield of strawberry under irrigation and soil mulches for different cultivation environments

2006 ◽  
Vol 63 (5) ◽  
pp. 417-425 ◽  
Author(s):  
Regina Célia de Matos Pires ◽  
Marcos Vinícius Folegatti ◽  
Francisco Antonio Passos ◽  
Flávio Bussmeyer Arruda ◽  
Emílio Sakai
Keyword(s):  
Open Field ◽  
Vegetative Growth ◽  
Growth And Yield ◽  
Plastic Mulch ◽  
Area Index ◽  
Protected Cultivation ◽  
Irrigation Time ◽  
Clear Plastic ◽  
Marketable Fruit ◽  
Irrigation Levels

The vegetative growth and yield of strawberry in relation to irrigation levels and soil mulches are still not well known, mainly for different environmental conditions. Two experiments were carried out in Atibaia, SP, Brazil, during 1995, one in a protected environment and the other in an open field, to evaluate the cultivar Campinas IAC-2712, under different irrigation levels and soil mulches (black and clear polyethylene). Three water potential levels in the soil were used in order to define irrigation time, corresponding to -0.010 (N1), -0.035 (N2), and -0.070 (N3) MPa, measured through tensiometers installed at the 10 cm depth. A 2 × 3 factorial arrangement was adopted, as randomized complete block, with 5 replicates. In the protected cultivation, the irrigation levels of -0.010 and -0.035 MPa and the clear plastic mulch favored the vegetative growth, evaluated through plant height, maximum horizontal dimension of the plant, leaf area index, as well as by total marketable fruit yield and its components (mean number and weight of fruits per plant). In the open field cultivation, no effect of treatments due to rainfall were observed.

scholarly journals Growth and yield of sweet cherry trees on different roostocks

1999 ◽  
Vol 5 (3-4) ◽  
Author(s):  
K. Hrotkó ◽  
L. Magyar ◽  
G. Simon
Keyword(s):  
Sweet Cherry ◽  
Cross Sectional Area ◽  
Tree Size ◽  
Growth And Yield ◽  
Sectional Area ◽  
Cumulative Yield ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Biennial Bearing ◽  
Similar Tendency

The first nine years' results of sweet cherry rootstock trial from Hungary are presented with the aim to select efficient rootstocks for the local ecological conditions. The trials were established in 1989 with 'Van' and 'Germersdorfi óriás' cultivars on the following rootstocks: mahaleb Sainte Lucie 64, Colt, MxM 14, MxM 97. All the trees were headed at 80 cm and trained to a modified Brunner-spindle system. Tree size and yield was measured every year, and the cumulative yield efficiency was calculated. Based upon the results, mahaleb cherry SL 64 is a vigorous rootstock with good compatibility and productivity. In comparison to SL 64. the trunk cross-sectional area and canopy spread of the 'Van' trees decreased by 10-15% on rootstock Colt, while the trees of 'Germersdorfi orias' on Colt roostock grew even larger than on SL 64. Considerable 30-40 % reduction of tree size was achieved on trees grafted on M x M hybrids. Trees of `Germersdorfi óriás' showed a similar tendency without significant differences. The cumulative yield efficiency of `Van' trees after nine years was highest on rootstock MxM 14, followed by Sainte Lucie 64. Trees on Colt and MxM 97 rootstocks showed low productivity. `Germersdorfi óriás' produced the highest cumulative yield efficiency on SL 64, followed by MxM 14 and Colt and last MxM 97. Biennial bearing index of heavy cropping 'Van' trees was smaller than that of `Germersdorfi óriás'. The trees of 'Van' on MxM 97 showed higher biennial bearing index, while 'Germersdorfi orias' on different rootstocks showed similar tendency, but without significant differences. MxM 14 and MxM 97 rootstocks reduced the crotch angle of the shoots on both sweet cherry varieties which is disadvantegous to spindle training. Slight suckering (1-3/year) of the rootstocks Colt, MxM 14 and MxM 97 were observed during the first few years.

GROWTH AND YIELD OF PEAR CULTIVARS ON SEVERAL ROOTSTOCKS

1988 ◽  
Vol 68 (4) ◽  
pp. 1177-1183
Author(s):  
F. KAPPEL ◽  
H. A. QUAMME
Keyword(s):  
Fire Blight ◽  
Fruit Size ◽  
Pyrus Communis ◽  
Cross Sectional Area ◽  
Growth And Yield ◽  
Sectional Area ◽  
Cydonia Oblonga ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Pyrus Communis L

Two rootstock plantings, with Bartlett and Harvest Queen as scion cultivars, were planted in 1976 and 1977 to compare a number of Old Home × Farmingdale (OH × F), Pyrus communis L., clonal rootstocks with Quince A, Cydonia oblonga L. (Buerre Hardy interstock), and Bartlett seedling rootstocks. Many of the Bartlett trees died because of infection by fire blight whereas very few Harvest Queen trees have died. Trunk cross-sectional area was affected by rootstock with OH × F 69 producing the largest trees and Quince A or OH × F 333 the smallest trees. Annual yield was affected by rootstock with OH × F 69 and OH × F 87 having the highest per tree yields. Mean fruit size of Harvest Queen was greater on Quince A, OH × F 69 and OH × F 87 whereas, OH × F 333 produced the smallest fruit. OH × F 51 had the best yield efficiency (accumulated yield/trunk cross-sectional area), followed by OH × F 69 and OH × F 87. Predicted per hectare yields and optimum tree densities were calculated and discussed.Key words: Pyrus communis, Old Home × Farmingdale rootstock, accumulated yield, trunk cross-sectional area

scholarly journals Prohexadione calcium on shoot growth of 'Starkrimson' pear trees

2017 ◽  
Vol 52 (2) ◽  
pp. 75-83 ◽  
Author(s):  
Mateus da Silveira Pasa ◽  
Todd Einhorn
Keyword(s):  
Vegetative Growth ◽  
Shoot Growth ◽  
Block Design ◽  
Fruit Size ◽  
Internode Length ◽  
Soluble Solids ◽  
Cross Sectional ◽  
Growing Seasons ◽  
Return Bloom ◽  
Prohexadione Calcium

Abstract: The objective of this work was to evaluate the fruiting and vegetative growth of 'Starkrimson' pear in response to the application of prohexadione calcium (P-Ca). P-Ca (250 mg L-1) was sprayed to scaffold limbs and to whole trees in commercial orchards. A randomized complete block design was used to minimize declivity effects. Vegetative growth (length and number of shoots, increment in limb and trunk cross-sectional area, number of nodes, and internode length), production (fruit number, yield, yield efficiency, and fruit size), and return bloom were evaluated from 2010 to 2013. P-Ca efficiently controlled shoot growth in all growing seasons, when applied early in the season, due to the reduction in internode length. Production was not negatively affected by the application of P-Ca in all years and at both sites, and fruit size and return bloom were not reduced. Fruit quality attributes were also little affected by P-Ca, except for total soluble solids content, which was lower than that of the control. This shows that P-Ca is efficient to manage tree vigor in high-density 'Starkrimson' pear orchards.

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