scholarly journals 794 PB 062 THE ROLE OF PHOSPHORUS IN MAGNESIUM TRANS LOCATION IN MUSCADINES

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 547a-547
Author(s):  
Creiehton L. Gunton ◽  
James M. Spiers
Keyword(s):  
Growing Season ◽  
Sand Culture ◽  
P Fertilization ◽  
Mg Deficiency ◽  
Vitis Rotundifolia ◽  
Deficiency Symptoms ◽  
Second Year ◽  
Mg Content ◽  
Nutrient Solutions

The role of phosphorus (P) in magnesium (Mg) translocation from roots to leaves of muscadines (Vitis rotundifolia Michx.) was investigated in shadehouse experiments. Vines of 13 clones were grown for two seasons in sand culture fertilized with nutrient solutions containing no P (-P), 20 PPM P (+P), and -P plus P added during the two weeks before harvest (-P+P). Leaves were sampled at the end of each growing season and in July of the second year and analyzed for P, potassium (K), and Mg content. Mg and K contents of roots were determined at the end of the second year. No interactions occurred between clones and P fertilization levels for Mg or K content, indicating no differences among clones in response of these minerals to P treatments. Leaf Mg content was slightly but significantly lower for -P than +P treatments in the `92 and July `93 samples but about rhe same in September `93. Root Mg content in September `93 was higher for +P than -P or -P+P. No evidence was found that Mg translocation from root to leaves was mediated by P. No Mg deficiency symptoms were visible on the leaves for any treatment.

scholarly journals Magnesium nutrition of apple trees I. Preliminary studies

2015 ◽  
Vol 29 (2) ◽  
pp. 159-177
Author(s):  
A. Sadowski ◽  
J. Pękacki ◽  
W. Szabłowski ◽  
K. Ścibiesz
Keyword(s):  
Fruit Quality ◽  
High Ratio ◽  
Root Penetration ◽  
Apple Trees ◽  
Factors Affecting ◽  
Mg Deficiency ◽  
Deficiency Symptoms ◽  
Fruit Drop ◽  
Old Trees ◽  
Mg Content

Symptoms of Mg deficiency on apple trees in the Warsaw district, Central Poland are described and illustrated. Results of soil and leaf analyses of deficient and healthy trees and factors affecting Mg deficiency in apples are discussed. Mg deficiency was found mainly in young trees grown on light, sandy or sandy loamy grey-brown podsolic soils; an old trees it was very rare, because of deep root penetration and utilization of Mg from illuvial horizons rich in Mg. Severe Mg deficiency symptoms appeared on old trees, vigorously growing after topworking with Bancroft scions. Low soil and leaf of Mg content a high available potassium to magnesium ratio in the soil and high ratio in the leaves are suggested to be important factors promoting Mg deficiency symptoms. A three years' experiment run on old Bancroft apple trees showed that 400 kg of MgO applied in epsomite to the soil were as effective as 4 sprays of 2% epsomite. Soil or foliar Mg fertilization did not have any significant effect on tree growth, yields, fruit drop and fruit quality.

Recovery of flue-cured tobacco from magnesium deficiency: changes in leaf magnesium content and effects on leaf quality

1972 ◽  
Vol 23 (4) ◽  
pp. 641 ◽  
Author(s):  
A Pinkerton
Keyword(s):  
Magnesium Deficiency ◽  
Magnesium Content ◽  
High Rate ◽  
Sand Culture ◽  
Tobacco Plants ◽  
Leaf Quality ◽  
Deficiency Symptoms ◽  
Nutrient Solutions

Twenty-four days after being transplanted into sand culture outdoors, tobacco plants were supplied with nutrient solutions with and without magnesium. Magnesium at two levels was resupplied to some deficiency-stressed plants 6, 11, 16, or 26 days later, and all plants were grown to maturity. The value of cured leaf was affected adversely when the period without magnesium exceeded 6 days. Quality of top leaf, but not of cutters, was improved when resupply was made at the rate necessary for maximum leaf value when supplied throughout. Addition of magnesium at a higher level improved the quality of leaf lower on the stalk, but led to an accumulation of magnesium in top leaf with subsequent impairment of quality. It appeared that the leaf concentration of magnesium had to fall below 0.2% for a period of between 5 and 10 days for leaf deficiency symptoms to appear. The application of magnesium, even at a high rate, upon the appearance of the first symptoms of deficiency resulted in a loss of over 25% in the value per plant.

Effects of foliar application of magnesium sulphate on the quality and magnesium content of flue-cured tobacco

1974 ◽  
Vol 14 (70) ◽  
pp. 677 ◽  
Author(s):  
A Pinkerton ◽  
PN Person
Keyword(s):  
Adverse Effect ◽  
Magnesium Sulphate ◽  
Foliar Application ◽  
Magnesium Content ◽  
Magnesium Concentration ◽  
Sand Culture ◽  
Deficiency Symptoms ◽  
Tobacco Seedlings ◽  
The Difference ◽  
Nutrient Solutions

Tobacco seedlings were not damaged by sprays containing up to 20 per cent magnesium sulphate, but deleterious effects on leaf were observed when several applications of three per cent or more were applied to full-sized plants. In an outdoor trial with tobacco in sand culture plants were supplied with nutrient solutions with and without magnesium. The effects of foliar application of two per cent magnesium sulphate on quality and magnesium concentration in the cured leaf were studied. Seven sprays applied at about seven day intervals raised the magnesium concentration in leaves by 0.30 to 0.40 per cent Mg. Five sprays applied after the onset of deficiency symptoms raised the concentration in leaves by 0.1 6 to 0.25 per cent Mg, and improved quality greatly compared with leaves from deficient plants. Application of one spray several days prior to picking increased the concentration in leaves by approximately 0.08 per cent Mg, but had an adverse effect on value. The value of the leaf from sprayed plants was never as good as that from the best plants supplied with magnesium via the roots only even though the magnesium concentrations in leaf were similar. The difference in quality was not attributable to deleterious effects of high sulphur content.

scholarly journals Magnesium nutrition of apple trees. III. Comparison of different methods of magnesium fertilization

2015 ◽  
Vol 29 (2) ◽  
pp. 201-217
Author(s):  
A. Sadowski ◽  
E. Jadczuk ◽  
J. Pękacki ◽  
K. Ścibisz
Keyword(s):  
Sandy Loam ◽  
First Year ◽  
Mg Deficiency ◽  
Deficiency Symptoms ◽  
Fruit Drop ◽  
K Fertilizer ◽  
Loam Soil ◽  
Recommendations For Practice ◽  
One Year ◽  
Mg Content

In the period 1969-1973 two experiments were performed in young orchards in Central Poland: a four-year experiment at Julianów, on sandy loamy soil on underlying sand and one-year experiment at Kośmin, on sandy loam soil on clay loam. At Kosmin, in spite of a high Mg content in the subsoil, Mg deficiency symptoms appeared, because of shallow rooting owing to poor aeration. In both experiments, foliar sprays with epsomite were less effective than fertilization to the soil; at Kośmin even eight sprays were less effective than soil dressings. Mg losses from a sandy soil due to leaching were high, particularly where sand was present in the whole profile; under these conditions the least losses of Mg were from split doses of epsomite (Mg<sub>3x120</sub>). Single doses of epsomite were the most effective in increasing leaf Mg content, reducing Mg deficiency symptoms and promoting growth of trees in the first year after application; in the later years split doses of epsomite and a single initial dose of magnesium lime were more effective. Effects of Mg fertilization on growth and yields of apples were rather slight, when K fertilizer doses were low. No effect of Mg fertilization upon fruit drop and fruit quality was found. Preliminary recommendations for practice are given.

scholarly journals Magnesium nutrition of apple trees I. Kit eel of K and Mg fertilization and comparison of soil and foliar treatments with magnesium sulphate

2015 ◽  
Vol 29 (2) ◽  
pp. 179-199
Author(s):  
A. Sadowski ◽  
E. Jadczuk ◽  
J. Pękacki ◽  
K. Ścibisz
Keyword(s):  
Fruit Set ◽  
Apple Trees ◽  
Fruit Storage ◽  
Soil Layers ◽  
Mg Deficiency ◽  
Deficiency Symptoms ◽  
K Fertilizer ◽  
Negative Effect ◽  
Mg Content ◽  
K Fertilization

In an experiment, performed in 1968-1970 on young Bancroft and Mclntosh apple trees on sandy loamy soil, Mg fertilization at the dose of 400 kg of MgO per year, in the form of epsomite increased available Mg content in both 0-20 and 20-40 cm soil layers. After 4 years only 20-29% of the Mg applied remained in these layers. K fertilization at the dose of 300 kg of K<sub>2</sub>O per ha in the form of potassium salts increased available K<sub>2</sub>O content, and 85–97% of additionally applied potassium remained in the top soil layers. K fertilization decreased leaf Mg content, increased leaf K content, increased Mg deficiency symptoms and in the absence of Mg reduced tree growth. Fruit set and fruit storage quality were adversely affected by the K fertilizer dose of 300 kg of K<sub>2</sub>O as compared with 60 kg of K<sub>2<s/ub>O per ha. Mg fertilization to the soil increased leaf Mg content, decreased Mg deficiency symptoms and counteracted the negative effect of high doses of K<sub>2</sub>O on growth. It did not have any effect on growth when K fertilization was moderate; no effect on yield was found. Four sprays of 2% epsomite applied each season were less effective in increasing leaf Mg content and in controlling Mg deficiency symptoms than soil dressings of this compound. Foliar sprays increased fruit set and early yields (in the 4th year after planting). Mg applied to the soil or to the leaves increased the green skin colour of Bancroft apples; it did not affect bitter pit incidence.

scholarly journals 793 PB 039 CALCIUM, MAGNESIUM, AND NITROGEN FERTILIZTION AFFECTS LEAF NUTRIENT CONTENT AND GROWTH OF `STERLING' MUSCADINE GRAPE

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 546f-546
Author(s):  
James M. Spiers ◽  
John H. Braswell
Keyword(s):  
Plant Growth ◽  
Nutrient Content ◽  
Sand Culture ◽  
Elemental Content ◽  
Vitis Rotundifolia ◽  
Deficiency Symptoms ◽  
Calcium Magnesium ◽  
Calcium Fertilization ◽  
Highly Correlated ◽  
Leaf N

The effects of varying N, Ca, and Mg fertilization levels on plant growth and leaf elemental content of `Sterling' muscadine grapes (Vitis rotundifolia Michaux) were studied in a 2 year sand culture experiment. Increased N levels reduced leaf K, Ca, and Mn and increased leaf N and P concentrations plus plant growth. Calcium fertilization increased leaf Ca, decreased leaf Mg, but did not affect plant growth. Mg fertilization reduced leaf K and Ca and increased leaf Mg plus plant growth. Visual symptoms, assumed to be Mg deficiencies, were decreased by Mg fertilization and highly correlated to leaf Mg content. Plants which received the highest Ca fertilizer level had fewer deficiency symptoms when treated with the highest rate of N. Calcium fertilization tended to slow both Mg uptake and deficiency symptoms reductions caused by increases in levels of applied Mg. Growth of `Sterling' muscadine plants was positively correlated to leaf N and Mg and negatively related to leaf K, Ca, Mn, Zn, and Cu concentrations.

Magnesium and Hearing

2003 ◽  
Vol 14 (04) ◽  
pp. 202-212 ◽  
Author(s):  
Michael J. Cevette ◽  
Jürgen Vormann ◽  
Kay Franz
Keyword(s):  
Hair Cells ◽  
Auditory Nerve ◽  
Mg Deficiency ◽  
Noise Damage ◽  
Susceptibility To Noise ◽  
Major Progress ◽  
A Current ◽  
Putative Mechanism ◽  
Increased Susceptibility

The last several decades have revealed clinical and experimental data regarding the importance of magnesium (Mg) in hearing. Increased susceptibility to noise damage, ototoxicity, and auditory hyperexcitibility are linked to states of Mg deficiency. Evidence for these processes has come slowly and direct effects have remained elusive because plasma Mg levels do not always correlate with its deficiency. Despite the major progress in the understanding of cochlear mechanical and auditory nerve function, the neurochemical and pharmacologic role of Mg is not clear. The putative mechanism suggests that Mg deficiency may contribute to a metabolic cellular cascade of events. Mg deficiency leads to an increased permeability of the calcium channel in the hair cells with a consequent over influx of calcium, an increased release of glutamate via exocytosis, and over stimulation of NMDA receptors on the auditory nerve. This paper provides a current overview of relevant Mg metabolism and deficiency and its influence on hearing.

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