Effect of soil types and rootstocks on root distribution, chemical composition of leaves and yield of valencia oranges

Soil Research ◽  
1979 ◽  
Vol 17 (2) ◽  
pp. 335 ◽  
Author(s):  
EH Mikhail ◽  
BM El-Zeftawi
Keyword(s):  
Chemical Composition ◽  
Root Distribution ◽  
Sandy Loam ◽  
Soil Types ◽  
Valencia Orange ◽  
Orange Trees ◽  
Leaf Composition ◽  
Manganese Magnesium

Effects of three soil types and three rootstocks on the performance of Valencia orange trees as measured by root distribution, leaf composition and yield were studied. The majority of roots were concentrated in the top 60 cm of soil. Trees on Murray sand had twice as many roots as on Barmera sand 'shallow phase', or as on Moorook sandy loam below 90 cm. Chlorophyll and iron levels were lowest in new 3-month-old leaves and increased with age. Levels of zinc, manganese, magnesium, calcium and chloride showed similar trends. Trees on Moorook sandy loam were not chlorotic in spite of the low chlorophyll in their leaves and the lowest production.

Soil pH, extractable phosphorus, and exchangeable cations as affected by rates of fertiliser nitrogen, phosphorus, and potassium applied over several years to Valencia orange trees

1994 ◽  
Vol 34 (3) ◽  
pp. 419 ◽  
Author(s):  
RA Sarooshi ◽  
RG Weir ◽  
IM Barchia
Keyword(s):  
Soil Ph ◽  
Sandy Loam ◽  
Soil Depth ◽  
Exchangeable Cations ◽  
Available P ◽  
Sodic Soils ◽  
Strong Negative Correlation ◽  
Soil P ◽  
Valencia Orange ◽  
Orange Trees

The long-term, annual application of nitrogen (N), phosphorus (P), and potassium (K) to the drip area of Valencia orange trees growing in a Tiltao sandy loam soil in the Sunraysia district of the lower Murray was investigated for its effect on soil pH, Bray 1 extractable soil P, and exchangeable cations calcium (Ca), magnesium (Mg), K, sodium (Na), and aluminium (Al) at 5 soil depths.Nitrogen (applied as ammonium nitrate) generally lowered soil pH to a depth of 30 cm, the effect increasing with rate of applied N. At 20 cm depth, the highest rate of applied N (450 kg/ha) reduced soil pH from 7.6 to 3.9, while 150 kg N/ha resulted in a soil pH of 5.0. Consequently, levels of exchangeable Ca, Mg, K, and Na in the soil were lower. There was a strong negative correlation between soil A1 and soil pH. At soil depths of 10-30 cm, the highest rate of applied N resulted in high levels (>20%) of exchangeable A1 as a proportion of the effective cation exchange capacity (CEC). Available soil P increased with rate of applied P, but the effect decreased with depth. Significantly (P<0.05) increased levels of available P were found to 30 cm depth when P was applied at 30 and 90 kg/ha, and to 60 cm depth at 180 kg P/ha. At 180 kg P/ha, Ca from superphosphate decreased Mg to 60 cm depth. Soil K levels were higher with increased rate of applied K and increased soil depth. The highest rate of applied K (360 kg/ha) depressed available P to 90 cm depth. Exchangeable Mg, K and Na percentages of the CEC in most treatments and at most soil depths were above the desirable range. Soil Na levels for some treatments and depths approached the level for sodic soils.

Sink strength of citrus rootstocks under water deficit

2021 ◽  
Author(s):  
Simone F da Silva ◽  
Marcela T Miranda ◽  
Vladimir E Costa ◽  
Eduardo C Machado ◽  
Rafael V Ribeiro
Keyword(s):  
Plant Growth ◽  
Root Growth ◽  
Water Deficit ◽  
Carbon Allocation ◽  
Sink Strength ◽  
Rangpur Lime ◽  
Carbon Supply ◽  
Valencia Orange ◽  
Source Sink ◽  
Orange Trees

Abstract Carbon allocation between source and sink organs determines plant growth and is influenced by environmental conditions. Under water deficit, plant growth is inhibited before photosynthesis and shoot growth tends to be more sensitive than root growth. However, the modulation of source-sink relationship by rootstocks remain unsolved in citrus trees under water deficit. Citrus plants grafted on Rangpur lime are drought tolerant, which may be related to a fine coordination of the source-sink relationship for maintaining root growth. Here, we followed 13C allocation and evaluated physiological responses and growth of Valencia orange trees grafted on three citrus rootstocks (Rangpur lime, Swingle citrumelo and Sunki mandarin) under water deficit. As compared to plants on Swingle and Sunki rootstocks, ones grafted on Rangpur lime showed higher stomatal sensitivity to the initial variation of water availability and less accumulation of non-structural carbohydrates in roots under water deficit. High 13C allocation found in Rangpur lime roots indicates this rootstock has high sink demand associated with high root growth under water deficit. Our data suggest that Rangpur lime rootstock used photoassimilates as sources of energy and carbon skeletons for growing under drought, which is likely related to increases in root respiration. Taken together, our data revealed that carbon supply by leaves and delivery to roots are critical for maintaining root growth and improving drought tolerance, with citrus rootstocks showing differential sink strength under water deficit.

Improving Valencia Orange Trees Status with Zinc Application

2020 ◽  
Vol 11 (12) ◽  
pp. 1173-1177
Author(s):  
A. Ibrahim ◽  
M. Gad
Keyword(s):  
Valencia Orange ◽  
Orange Trees ◽  
Zinc Application

scholarly journals Effect of Vector Control and Foliar Nutrition on the Quality of Orange Juice Affected by Huanglongbing: Sensory Evaluation

HortScience ◽  
2017 ◽  
Vol 52 (8) ◽  
pp. 1092-1099 ◽  
Author(s):  
Anne Plotto ◽  
Elizabeth Baldwin ◽  
Jinhe Bai ◽  
John Manthey ◽  
Smita Raithore ◽  
...  
Keyword(s):  
Orange Juice ◽  
Untreated Control ◽  
Orange Peel ◽  
Foliar Nutrition ◽  
Insecticide Treatment ◽  
Fundamental Knowledge ◽  
Valencia Orange ◽  
Orange Trees ◽  
Negative Attributes

A 3-year study was undertaken to establish the effect of field nutritional sprays, combined with insecticide treatments or not against Asian Citrus psyllid, on the fruit quality of ‘Valencia’ orange trees affected by the greening disease Huanglongbing (HLB). Four replicated plots were harvested, juiced, and pasteurized. Nine to twelve trained panelists evaluated the juice using seven flavor, five taste, four mouthfeel and three aftertaste descriptors. There was little difference between treatments in 2013; only orange peel flavor and bitterness were significantly lower for the insecticide treatment. In 2014, positive attributes, such as orange and fruity flavor, sweetness and mouthfeel body, were significantly higher in the insecticide treatment. Sourness was highest in untreated control, and there were no differences between treatments for bitterness. In 2015, negative attributes, such as grapefruit, orange peel and typical HLB flavor, sourness, bitterness, and astringency, were significantly higher in untreated control fruit, suggesting perhaps that the beneficial effect of nutritional and insecticide treatments was cumulative, only manifesting on the 3rd year of the study, and or because of the progression of the disease affecting untreated controls. Data are discussed in relation to juice chemical composition, including volatiles, sugars, acids, limonoids, and flavonoids, adding to the fundamental knowledge concerning chemical drivers of orange flavor.

EFFECTS OF SOME TRACE ELEMENTS ON GRASS AND LEGUME PRODUCTION IN NOVA SCOTIA

1962 ◽  
Vol 42 (1) ◽  
pp. 46-52 ◽  
Author(s):  
G. G. Smeltzer ◽  
W. M. Langille ◽  
K. S. MacLean
Keyword(s):  
Trace Elements ◽  
Nova Scotia ◽  
Chemical Composition ◽  
Field Experiment ◽  
Plant Tissue ◽  
Dry Matter ◽  
Soil Types ◽  
Dry Matter Production ◽  
Matter Production ◽  
Legume Production

In a field experiment, conducted on four different soil types, trace elements cobalt, zinc, manganese, copper, sodium and molybdenum were applied by sprayer to a grass-legume sward in late September in both 1955 and 1956. Treatment differences were evaluated in terms of total dry matter production and by the chemical composition of the plant tissue. The elements applied were detectable in plant tissue, but herbage yields were not affected. Apparently the trace elements in these different soil types were in the range of sufficiency for maximum herbage production.

Improvement of leaf nitrogen content inference in Valencia-orange trees applying spectral analysis algorithms in UAV mounted-sensor images

2019 ◽  
Vol 83 ◽  
pp. 101907 ◽  
Author(s):  
Lucas Prado Osco ◽  
Ana Paula Marques Ramos ◽  
Érika Akemi Saito Moriya ◽  
Maurício de Souza ◽  
José Marcato Junior ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Nitrogen Content ◽  
Leaf Nitrogen ◽  
Leaf Nitrogen Content ◽  
Valencia Orange ◽  
Orange Trees

Digestibility and chemical composition of fractions of lucerne during spring and summer

1970 ◽  
Vol 75 (2) ◽  
pp. 213-222 ◽  
Author(s):  
K. R. Christian ◽  
D. B. Jones ◽  
M. Freer
Keyword(s):  
Chemical Composition ◽  
Dry Matter ◽  
Dry Weight ◽  
Chemical Components ◽  
Shoot Height ◽  
Time Of Year ◽  
Highly Correlated ◽  
Leaf Composition

SUMMARYBulk harvests of primary growth were made at intervals during the spring and summer of 2 consecutive years from an ungrazed area of lucerne (Medicago sativa) and the digestibility by sheep was measured. At the same times, shoots of known length representative of the sward were collected, divided into 7·5 cm lengths, and separated into leaf and stem for the determination of ash, nitrogen, cellulose, and in vitro organic matter digestibility.Digestibility and leaf: stem ratio of the bulk harvests decreased and dry matter increased as the season advanced. Leaf composition changed little, but stem increased in lignin and decreased in ash and in vitro digestibility. In vitro digestibility and leaf: stem ratio were highly correlated with sheep digestibility.Chemical composition of shoots of known heights was similar to that of the bulk harvests. Leaf weights/shoot tended to increase linearly with height of shoot, whereas stem increased nearly as the square of the height. Dry matter of leaf and stem were inversely related to leaf:stem ratio. Stem digestibility decreased with leaf:stem ratio and with increase in shoot height.Chemical components of shoot fractions were associated with each other and were largely dependent on the distance from the top of the shoot at which they had been taken, irrespective of shoot height or time of year. Bottom stems had lower ash, nitrogen and digestibility but higher cellulose, dry weight and dry matter than top stems, whose composition approached that of leaves. Leaf fractions showed little consistent trend with position on the shoot.Some of the difficulties in studying changes in plant composition under field conditions are discussed.

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