Okra Leaf Growth, Fruit Set, and Harvesting Duration With Cultivar and Sowing Date

2014 ◽  
Vol 22 (1) ◽  
pp. 101-111 ◽  
Author(s):  
A. W. Salau ◽  
E. A. Makinde
Keyword(s):  
Fruit Set ◽  
Leaf Growth ◽  
Sowing Date

scholarly journals Growth analysis in relation to sowing dates in four varieties of wheat: a functional approach

1970 ◽  
Vol 2 (2) ◽  
pp. 17-25
Author(s):  
SA Haider
Keyword(s):  
Growth Rate ◽  
Leaf Growth ◽  
Weight Ratio ◽  
Sowing Date ◽  
Functional Approach ◽  
Crop Growth Rate ◽  
Stages Of Growth ◽  
Key Words Wheat ◽  
Sowing Dates ◽  
Net Assimilation

Effect of three different sowing dates on growth of four varieties of wheat was analyzed using functional techniques. Crop growth rate (CGR), relative leaf growth rate (RLGR) and specific leaf area (SLA) were higher in the early sown plants compared to late sown plants. Net assimilation rate (NAR) in all the varieties increased slowly at the early stages of growth while it increased sharply at the later stages with fluctuations in most cases. The declining tendency was found in SLA at the middle stage of growth except variety C 306. Higher values of CGR were found in the early sown Protiva, leaf weight ratio (LWR) in the late sown C 306 and early sown Opata, RLGR in the early sown Opata and C 306, SLA in the late sown Opata and Protiva and NAR in all the four varieties when they were sown late. Key words: Wheat; sowing date; growth; functional technique DOI: 10.3329/jles.v2i2.7492 J. Life Earth Sci., Vol. 2(2) 17-25, 2007  

Aleurocanthus woglumi (citrus blackfly).

2021 ◽  
Author(s):  
Ru Nguyen
Keyword(s):  
New World ◽  
Fruit Set ◽  
Leaf Growth ◽  
Crop Losses ◽  
Nitrogen Levels ◽  
Sooty Mould ◽  
Citrus Groves ◽  
Aleurocanthus Woglumi ◽  
The Usa

Abstract Feeding by A. woglumi damages new leaf growth, reducing nitrogen levels in infested leaves. Sooty mould growing on honeydew deposits blocks light and air from the leaves, reducing photosynthesis. This can reduce fruit set by up to 80% or more (Eberling, 1954). Crop losses of limes due to A. woglumi were recorded at 25% by Watts and Alam (1973). In Mexico, citrus blackfly is regarded as a threat to citrus crops and to other crops such as mangoes, pears or coffee grown adjacent to heavily infested citrus groves. A. woglumi is a constant menace to citrus and other crops in the USA and Venezuela. It has been recorded seriously affecting citrus in India (David and Subramaniam, 1976). Le Pelley (1968) mentions it as a severe pest of coffee in the New World.

scholarly journals Spur Fruit Set Is Negatively Related with Current-year Spur Leaf Area in Almond

HortScience ◽  
2015 ◽  
Vol 50 (2) ◽  
pp. 322-325 ◽  
Author(s):  
Sergio Tombesi ◽  
Bruce D. Lampinen ◽  
Samuel Metcalf ◽  
Theodore M. DeJong
Keyword(s):  
Leaf Area ◽  
Fruit Set ◽  
Leaf Growth ◽  
Alternate Bearing ◽  
Negatively Associated ◽  
Almond Tree ◽  
Bearing Unit ◽  
The Relationship

Almond spurs are known to be the primary bearing unit in almond tree and are subject to alternate bearing. Fruits are a strong sink in bearing spurs and can influence spur leaf growth. At the same time the percent of flowers that set fruit on a spur (spur relative fruit set) could be influenced by the competition among multiple flowers/fruits borne on the same spur as well as by limited leaf area on the same spur. The aim of the present work was to investigate the relationship between current-year spur leaf area and spur absolute and relative fruit set. Approximately 2400 spurs were tagged and followed over 6 years and data concerning spur leaf area, number of flowers per spur, and number of fruits per spur were collected. Spur leaf area was reduced in fruiting spurs in comparison with non-fruiting spurs according to the number of fruits borne by each spur. This phenomenon contributes to spur alternate bearing because spur flowering and survival in the next year are a function of the leaf area in the current year. Relative fruit set in almond appears to be negatively associated with current-year spur leaf area. Competition among fruits on the same spur did not appear to influence spur relative fruit set.

scholarly journals Grapevine fruiting cuttings: validation of an experimental system to study grapevine physiology. I. Main vegetative characteristics

OENO One ◽  
1998 ◽  
Vol 32 (1) ◽  
pp. 1 ◽  
Author(s):  
Nathalie Ollat ◽  
Laurence Geny ◽  
Jean-Pierre Soyer
Keyword(s):  
Nutrient Solution ◽  
Vegetative Growth ◽  
Fruit Set ◽  
Leaf Growth ◽  
Experimental System ◽  
Cabernet Sauvignon ◽  
Cluster Development ◽  
Polyamine Content ◽  
Developmental Features ◽  
Different Levels

<p style="text-align: justify;">A method for producing fruiting cuttings of grapevine cv. Cabernet Sauvignon is described. The main developmental features of these cuttings are presented. The clusters reach maturity after 5 months and the period of cluster development is not shortened. Before flowering, a careful control of stem and leaf growth improves the partitioning of stored carbon towards the roots and the cluster. Vegetative growth occurs mainly between fruit set and veraison. During ripening, the leaf to fruit ratio is between 20 and 30 cm<sup>2</sup> of leaf area per gram of fruit. In the cuttings as well as in grapevines from the vineyard, free polyamine content in the leafblade does not change during development. Conjugate polyamine content does not evolve in the same way. It peaks at veraison for vineyard leaves but decreases continuously for cuttings. A proper nutrient solution provides a minerai composition in accordance with viticultural requirements. The cuttings also behave like vineyard plants in response to different levels of potassium in the nutrient solution.</p>

scholarly journals Almond Spur Autonomy: Leaf Growth, Floral Initiation and Spur Survival

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 851B-851 ◽  
Author(s):  
Richard J. Heerema* ◽  
Ted M. De Jong ◽  
Steven A. Weinbaum
Keyword(s):  
Leaf Area ◽  
Fruit Set ◽  
Light Exposure ◽  
Biological Activities ◽  
Leaf Growth ◽  
Floral Initiation ◽  
Flower Bud ◽  
Current Season ◽  
Carbohydrate Storage ◽  
Previous Season

Spurs are the primary bearing unit in mature `Nonpareil' almond (Prunus dulcis (Mill.) D.A. Webb) trees. Our objective was to determine whether almond spurs behave autonomously with respect to various biological activities throughout the season. If autonomous, a spur's carbohydrate demands are met primarily by its own leaves and, therefore, the sink to source ratio of the spur itself is expected to be closely linked to its growth and development. In these experiments almond spurs differing in leaf area and/or fruit number were monitored for leaf development, fruit set, floral initiation, spur survival and carbohydrate storage. Previous-season spur leaf area had no relation to the number of leaves preformed within the dormant vegetative bud or final spur leaf area in the current season, but spurs which fruited in the previous season began spring leaf expansion later and current-season spur fruiting was associated with lower spur leaf area. There was little or no relationship between final percentage fruit set at the spur level and spur leaf area in either the current or previous seasons. Current-season spur leaf area was positively related to both spur flower bud number and spur winter survival. Carbohydrate storage in dormant spurs increased with increasing previous-season spur leaf area. These data are consistent with the concept of spur autonomy especially with regards to spur activities late in the season. The relationships of some of these same spur parameters to spur light exposure are currently being investigated.

scholarly journals Development of Bacterial Spot, Incited by Xanthomonas cucurbitae, in Pumpkin Fields

HortScience ◽  
2015 ◽  
Vol 50 (5) ◽  
pp. 714-720 ◽  
Author(s):  
Abbasali Ravanlou ◽  
Mohammad Babadoost
Keyword(s):  
Growth Stage ◽  
Fruit Set ◽  
Leaf Growth ◽  
Leaf Tissue ◽  
Type I ◽  
Type Ii ◽  
Bacterial Spot ◽  
Leaf Type ◽  
Type Iii ◽  
Necrotic Spots

This study was conducted to assess occurrence of bacterial spot, incited by Xanthomonas cucurbitae, on pumpkin leaves and fruit. Development of the disease was monitored in 9, 14, and 15 commercial pumpkin fields in 2009, 2010, and 2011, respectively, in Illinois. Bacterial spot was observed from 4-leaf growth stage until the green leaf tissue was unavailable. Three types of lesions were observed on leaves, which were described as Type I, Type II, and Type III lesions. Type I lesions were small (1 mm), angular, brown necrotic spots, and numerous on each leaf. Type II lesions were angular, beige in the center with brown halo, numerous on each leaf, and measured 1 to 4 mm. Type III lesions were angular, translucent spots with a narrow chlorotic halo, only a few spots on each leaf, and measured 4 to 8 mm. Incidence and severity of bacterial spot on leaves were the greatest when fruit began to turn to orange. Bacterial lesions were observed on fruit from 1 week after fruit set until harvest. Lesions on fruit were circular, water-soaked, sunken, with beige centers and chlorotic halo, and measured 1 to 3 mm. Occurrence of bacterial spot on fruit was assessed in 17, 50, and 65 commercial pumpkin fields in 2009, 2010, and 2011, respectively. The disease on fruit was observed in 100%, 80%, and 88% of the fields surveyed in 2009, 2010, and 2011, respectively. The incidence of fruit with bacterial spot in all fields surveyed was 46%, 35%, and 24% in 2009, 2010, and 2011, respectively.

Heat stress affects flowering, berry growth, sugar accumulation and photosynthesis of Vitis vinifera cv. Semillon grapevines grown in a controlled environment

2010 ◽  
Vol 37 (3) ◽  
pp. 206 ◽  
Author(s):  
Dennis H. Greer ◽  
Chris Weston
Keyword(s):  
Vitis Vinifera ◽  
Fruit Set ◽  
Leaf Growth ◽  
Sugar Content ◽  
Dry Weight ◽  
Soluble Solids ◽  
Sugar Accumulation ◽  
Vitis Vinifera L ◽  
Controlled Environments ◽  
The Impact

High temperatures during the growing season characterise many grape growing regions in Australia and elsewhere in the world, and impact on many processes including growth and berry development. To quantify the impact of heat on the Vitis vinifera L. cv. Semillon, potted vines were grown in controlled environments and exposed to a temperature regime of 40/25°C at flowering, fruit set, veraison and mid-ripening stages. Vegetative and reproductive development was measured throughout and leaf photosynthesis and stomatal conductance tracked during heat exposures. Accumulation of soluble solids was determined during ripening. Leaf growth and stem extension were unaffected by heat whereas flowers completely abscised. Berries treated at fruit set developed normally and those treated at veraison and mid-ripening stopped expanding and sugar content stopped increasing. Photosynthesis was also affected on each occasion, with rates declining by 35% and taking 12 days to recover. Up to 10 mg carbon g (berry dry weight)–1 day–1 was required for ripening after veraison. For vines heat treated at veraison and mid-ripening, net carbon acquisition rates fell to below 4 mg carbon g (leaf dry weight)–1 day–1, which is inadequate to supply berry carbon requirements. This suggests that the impacts of heat on the ripening process can be traced back to the supply of carbon.

Effect of sowing date and nitrogen on yield, components yield and oil characteristic of medicinal flax

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
MM Rahimi ◽  
G Normohamadi ◽  
A Aeinehband
Keyword(s):  
Yield Components ◽  
Sowing Date

Investigations of alternative kale management: Production, regrowth and quality from different sowing and defoliation dates

2007 ◽  
pp. 29-33 ◽  
Author(s):  
H.E. Brown ◽  
S. Maley ◽  
D.R. Wilson
Keyword(s):  
Sowing Date ◽  
Linear Increase ◽  
Thermal Time ◽  
Total Production

Gruner kale showed a linear increase (8.0 kg DM/ha per °Cd) in biomass with sowings on 1 October, 3 November and 1 December producing 23, 19 and 17 t DM/ha (respectively) by the 29 May. Regrowth following mid season defoliation was slow (5.3 kg DM/ha per °Cd) reducing total production (relative to undefoliated) by 7.5 and 5.5 t DM/ha for treatments defoliated on the 29 January and 14 March, respectively. Keyworks: defoliation, kale, quality, regrowth, sowing date, thermal time, yield

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