Effect of pre harvest foliar application of micronutrients and sorbitol on flowering, pollen fertility and fruit set of litchi cv. Bombai

Fruit set is a major determinant of nut productivity. Boron has been shown to have a significant influence on flowering and fruit set in a number of crops but less is reported on almond. This paper presents results of foliar application of a B commercial product, Solubor(20.5% B) at a rate of 1,2,3lb/100 gallons to `Butte' and `Mono' almond cultivars Boron at 1 and 2lb increased fruit set in both open and hand pollinated trees by over 100% while 3lb was less effective. The resultant B concentration in flower buds was correlated to B concentration in flowers (R2=0.58) and immature fruits (R2=0.6) but not to summer and fall leaf, pistil, and pollen B concentration or fruit set.

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Effects of the Fall Foliar Urea Application on N Reserves and Fruiting Performance of Gala/M26 Apple Trees in Pot-in-Pot System

HortScience ◽

10.21273/hortsci.39.4.796a ◽

2004 ◽

Vol 39 (4) ◽

pp. 796A-796

Author(s):

Pinghai Ding* ◽

Minggang Cui ◽

Leslie H. Fuchigami

Keyword(s):

Fruit Set ◽

Foliar Application ◽

Fruit Size ◽

Growing Season ◽

Fruit Crops ◽

Apple Trees ◽

Fruit Thinning ◽

Tree Fruit ◽

Dormant Season ◽

Foliar Urea

Reserve nitrogen is an important factor for plant growth and fruiting performance in tree fruit crops. The fall foliar urea application appears to be an efficient method for increasing N reserves. The effect of fall foliar urea application on N reserves and fruiting performance were studied with four year old `Gala'/M26 trees grown in 20 gallon containers in a pot-in-pot system from 2001 to 2003 at the Lewis-Brown Horticulture Farm of Oregon State Univ.. The trees were either sprayed with 0 or 2 times 3% urea after harvest in October. Shoot and spur samples were taken at the dormant season for reserve N analysis. Fruit performance was recorded in the following growing season. The fall foliar application significantly increased spur N reserve and had the trend to increase shoot N reserve but not significantly. The fall foliar application significantly increased tree fruit set and cluster fruit set. With normal fruit thinning, fall foliar urea application has the trend to increase both tree yield and average fruit size; without fruit thinning, fall foliar urea application has the trend to increase tree yield. These results indicate that fall foliar urea application an effective method to increase reserve N for maintaining tree yield.

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Phenology of ‘Magallanes’ Pummelo (Citrus maxima) Trees and Its Growth and Development as Influenced by Potassium Nutrition

Asian Journal of Research in Agriculture and Forestry ◽

10.9734/ajraf/2019/v3i430043 ◽

2019 ◽

pp. 1-18

Author(s):

Alminda Magbalot-Fernandez ◽

Constancio C. De Guzman

Keyword(s):

Fruit Development ◽

Vegetative Growth ◽

Fruit Set ◽

Foliar Application ◽

Soil Analysis ◽

Fruit Size ◽

Tree Height ◽

Maximum Growth ◽

Nutrient Competition ◽

Citrus Maxima

This study aimed to determine the influence of potassium (K) fertilization on the vegetative growth, flowering and fruit development of 13-year old ‘Magallanes’ pummelo [Citrus maxima (Burm. Ex Rumph.) Merr.] trees. The experiment was conducted at South Davao Corporation (SODACO) farm, Davao city for 12-months duration. Five treatments were observed with increasing K levels were applied per tree: control (no fertilization), without K, 150 g K basal (recommended rate based on soil analysis), 225 g K basal, and 225 g K basal + foliar application. The critical stage of tree growth coincided with the months of May and August. Peak leaf flushing occurred in June and peak flowering with fruit set in April. The crucial stage of fruit development was noted two months after fruit set. Thus, optimum fertilization must be applied during these stages for maximum growth and production in ‘Magallanes’ pummelo. The vegetative growth of pummelo was not affected by increasing K rates. The recommended rate (150g K basal per tree) significantly increased canopy diameter by 76% but higher K rates did not increase tree height, due to the effect of fruit load and nutrient competition. On the other hand, increasing K rates to 50% higher than the recommended rate (225 g K per tree) increased the number of flushes by 36-100%. Flowering, fruit set and yield of ‘Magallanes’ pummelo were also enhanced by higher K rates. Flowering was increased by 4 times, fruit set by 86-100%, fruit number by 7 times, weight per fruit by 22-26%, and yields up to 9 times on trees composted with 225 g K rates. The fruit size (diameter and length), however, did not increase by increasing the K level.

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FOLIAR APPLICATION OF N-PHENYL-PHTHALAMIC ACID AFFECTS POLLINATION, FRUIT SET, YIELD, FRUIT CHARACTERS AND OIL CONTENT OF TWO OLIVE CULTIVARS

Journal of Plant Production ◽

10.21608/jpp.2015.49759 ◽

2015 ◽

Vol 6 (5) ◽

pp. 759-767

Author(s):

E. Mikhail ◽

I. Osman ◽

K. Goargiuos

Keyword(s):

Oil Content ◽

Fruit Set ◽

Foliar Application ◽

Phthalamic Acid ◽

Olive Cultivars ◽

Fruit Characters

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Potassium Fertilization for Higher Flowering and Fruit Yield in ‘Magallanes’ Pummelo (Citrus maxima)

Asian Journal of Agricultural and Horticultural Research ◽

10.9734/ajahr/2019/v3i430004 ◽

2019 ◽

pp. 1-8

Author(s):

Alminda Magbalot-Fernandez ◽

Constancio C. Deguzman

Keyword(s):

Fruit Set ◽

Foliar Application ◽

Fruit Yield ◽

Fruit Number ◽

Return Of Investment ◽

Potassium Fertilization ◽

Citrus Maxima ◽

K Fertilization

This study aimed to determine the influence of Potassium (K) fertilization on the flowering and fruit yield of 13-year old ‘Magallanes' pummelo [Citrus maxima (Burm. ex Rumph.) Merr.] trees. The experiment was conducted at South Davao Corporation (SODACO) farm, Davao City, Philippines for 12-month duration. Five treatments with increasing K levels were applied per tree: control, no K, 150 g K basal, 225 g K basal, and 225 g K basal + foliar application. Flowering, fruit set and yield of pummelo were enhanced by higher K rates. Flowering was increased by 4 times while fruit set by 86-100%. Fruit number was increased by 7 times, weight per fruit by 22-26%, and yields up to 9 times with 100% (return of investment) ROI on trees applied with 225 g K rates. The results of the study indicated the important role of K in improving the flowering, fruit yield and income of ‘Magallanes' pummelo.

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Reproductive biology of Duranta repens L. (Verbenaceae) in relation to its environment

International Journal of Horticultural Science ◽

10.31421/ijhs/14/3/803 ◽

2008 ◽

Vol 14 (3) ◽

Author(s):

D. Sharma ◽

A. Rana ◽

S. Chauhan ◽

S. V. S. Chauhan

Keyword(s):

Reproductive Biology ◽

Pollen Fertility ◽

Fruit Set ◽

Environmental Changes ◽

Ornamental Plant ◽

Floral Structure ◽

Visitation Rates ◽

Floral Density ◽

Different Seasons ◽

Temperature Ranges

Impact of environmental changes (temperature and RH) on reproductive biology in Duranta repens (Verbenaceae) growing at ten different sites of Agra was studied. It flowers throughout the year, with optimum flowering in September. The flowers are arranged in loose clusters on terminal or axillary racemes. They are either blue or lavender in colour, hermaphrodite, actinomorphic and complete. The plants exhibit floral polymorphism (increase and decrease in number of petals and stamens) and considerable variation in extent of pollen fertility, floral density, insect pollinators and fruit-set percentage. The changes in temperature and relative humidity during the entire flowering period, was found associated with the variation in floral structure, pollen fertility and fruit-set percentage. Based on the percentage of fruit-set during different seasons of a year, there were three distinct periods, namely maximum, moderate and minimum periods. The present paper deals with the comparative view of reproductive biology of this ornamental plant in these periods. During the months of August—November when temperature ranges between 13.7-36.6 °C and RH between 79-89% the plant exhibits maximum fruit-set percentage (68-85%). This was associated with maximum flowering, increase in floral size, and increase in visitation rates of pollinators and higher degree of pollen fertility. On the other hand, with temperature reaching to the maximum (15.1-41.5 °C) and reduction in RH (14.1-41.3%), the percentage of fruit-set was reduced to the minimum (21-30%). During this period, number of flowers/plant, floral size, pollen fertility, visitation rates of pollinators were reduced to the minimum. During this period floral polymorphism was also 'recorded.

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Fall Foliar-applied Boron Increases Tissue Boron Concentration and Nut Set of Almond

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.122.3.405 ◽

1997 ◽

Vol 122 (3) ◽

pp. 405-410 ◽

Cited By ~ 42

Author(s):

Agnes M.S. Nyomora ◽

Patrick H. Brown ◽

M. Freeman

Keyword(s):

Recent Work ◽

Boron Concentration ◽

Fruit Set ◽

Foliar Application ◽

Prunus Dulcis ◽

Commercial Product ◽

Flower Buds ◽

Fruit Tissue ◽

Visual Symptoms ◽

Early Fall

Fruit set is the major determinant of productivity in almond [Prunus dulcis (Mill D.A. Webb)] where seed is the commercial product. Boron influences flowering and fruit set in a number of crops, but little has been reported on this subject in almond. Here, we investigated the effect of a fall foliar application of B on fruit set and tissue B concentration in open pollinated `Butte' and `Mono' almond over a 2-year period. Early fall B application significantly increased the vegetative, floral, and fruit tissue B concentration in the subsequent year. The greatest increase in organ B concentration was observed in flower buds, flowers, and hulls. Recent work has demonstrated that B forms a B-sorbitol complex in Prunus species. This B-sorbitol complex is phloem mobile and is transported to sink organs. Here we demonstrate that fall-applied B is absorbed by the leaf and is subsequently transported (presumably as the B-sorbitol complex) to floral buds where it is available to flowers and, hence, influences fruit set and yield. It is concluded that fall foliar-applied B is a useful fertilization strategy that can be used to optimize tissue B concentration in species in which B is phloem mobile. Boron applied at 245 and/or 490 ppm significantly increased fruit set in `Butte' and `Mono' and increased yield of `Butte' in 1994 on open-pollinated trees (yield was not determined in 1993). The highest initial and second fruit set was associated with either the 245 or 490 ppm B treatments in both cultivars and both years. This increased fruit set resulted in yield increases of 53% and 4%, respectively, for `Butte' and `Mono'. Of the two cultivars, `Butte', which had lower tissue B concentration before B application, responded more significantly in yield to B application. Application of 735 ppm B was less effective than either 245 and 490 ppm B; however, no visual symptoms of excess B were observed.

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