scholarly journals Effects of Soil-Applied and Trunk and Petiole-Injected Manganese on Manganese Content of Coconut Palm (Cocos nucifera)

2010 ◽  
Vol 36 (6) ◽  
pp. 272-274
Author(s):  
Timothy Broschat ◽  
Joseph Doccola
Keyword(s):  
Untreated Control ◽  
Cocos Nucifera ◽  
Manganese Content ◽  
Calcareous Soils ◽  
Coconut Palm ◽  
Manganese Deficiency ◽  
Soil Application ◽  
Trunk Injection ◽  
Effective Result ◽  
Mn Concentrations

Manganese deficiency is a common and potentially fatal disorder of palms growing in highly leached and calcareous soils. Soil applications of MnSO4 may not always be effective in treating this disorder due to rapid oxidation of Mn to less available forms. Trunk injection with MnSO4 (2.0 g Mn) was found to be more effective in increasing foliar Mn concentrations than soil application (192 g Mn) or petiole injections with 0.1 g Mn in a single hole, or 0.5 g Mn divided among four holes. In contrast to trunk injection, neither petiole injections nor soil application of MnSO4 increased foliar Mn concentrations above that of the untreated control palms. Trunk injections, while effective, result in permanent wounds that could potentially serve as entry sites for the trunk pathogen Thielaviopsis paradoxa, especially on young palms with minimal trunks.

scholarly journals Phosphorous acid for controlling Phytophthora taxon Agathis in kauri glasshouse trials

2013 ◽  
Vol 66 ◽  
pp. 242-248 ◽  
Author(s):  
I.J. Horner ◽  
E.G. Hough
Keyword(s):  
Untreated Control ◽  
Foliar Spray ◽  
Phosphorous Acid ◽  
Phytophthora Species ◽  
In Vitro Tests ◽  
Potential Treatment ◽  
Soil Application ◽  
Soil Inoculation ◽  
Trunk Injection

Phytophthora taxon Agathis (PTA) is a serious problem in Auckland and Northland kauri forests Phosphorous acid (phosphite) is a potential treatment for infected or threatened trees In vitro tests on phosphiteamended agar showed that PTA was more sensitive to phosphite than other Phytophthora species commonly controlled by this chemical Before progressing to forest trials phosphite efficacy was tested on PTAinoculated kauri seedlings in the glasshouse Twoyearold kauri seedlings were inoculated with PTA applied directly to trunk wounds or by soil application Phosphite was applied as a foliar spray as a trunk injection or as a soil drench either 5 days before or 5 days after inoculation All untreated control trees died whether trunk or soilinoculated With phosphite injection survival was 100 following PTA soil inoculation and 67 following trunk inoculation Foliar spray and soil drenchapplied phosphite treatments were less effective than trunk injection although some trees survived

Correction of manganese deficiency in barley crops on calcareous soils. 2. Comparison of mixed and compound fertilizers

1973 ◽  
Vol 13 (63) ◽  
pp. 440 ◽  
Author(s):  
DJ Reuter ◽  
TG Heard ◽  
AM Alston
Keyword(s):  
Particle Size ◽  
Field Experiments ◽  
Phosphorus Uptake ◽  
Calcareous Soils ◽  
Nutrient Content ◽  
Manganese Deficiency ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Foliar Sprays ◽  
Compound Fertilizer

Mixed and compound fertilizers made from superphosphate and manganous sulphate were compared in field experiments as sources of manganese for barley on the calcareous soils of southern Yorke Peninsula, South Australia. The compound fertilizers were made by blending manganous sulphate with 'den-fresh' superphosphate before the granulation process: mixed fertilizers were made by mixing the components after manufacture. The fertilizers were applied at sowing at rates of 19 kg haw1P and 16 kg haelMn in one experiment and 28 kg ha-1 P and 6 kg ha-1 Mn in a second experiment. In the latter, up to three foliar sprays of manganous sulphate (1.3 kg ha-1 Mn per spray) were applied in addition. The rate at which the fertilizers reacted with the soil was studied in an incubation experiment, and the nutrient content of particle-size fractions of the fertilizers was also determined. Plant dry weight, manganese and phosphorus uptake, and grain yield were increased to a greater extent by application of the compound fertilizer than by the mixed fertilizer. Application of compound fertilizers at sowing also delayed the appearance of manganese deficiency symptoms in crops by two weeks compared with mixed fertilizers. Neither fertilizer prevented the occurrence of manganese deficiency and further yield increases were obtained by subsequent foliar sprays of manganous sulphate. Fertilizer manganese was rapidly immobilized in the soil. After 167 hours' incubation, approximately three quarters of that added in manganous sulphate, and in the mixed and compound fertilizers was not extractable in divalent form. The variation in nutrient content of particle size fractions of a compound fertilizer was much less than that in a mixed fertilizer.

scholarly journals Advances in Coconut palm propagation

2019 ◽  
Vol 41 (2) ◽  
Author(s):  
Ana da Silva Lédo ◽  
Edson Eduardo Melo Passos ◽  
Humberto Rolemberg Fontes ◽  
Joana Maria Santos Ferreira ◽  
Viviane Talamini ◽  
...  
Keyword(s):  
Twentieth Century ◽  
Tissue Culture ◽  
Plant Tissue Culture ◽  
Cocos Nucifera ◽  
Coconut Palm ◽  
Tropical Species ◽  
Culture Techniques ◽  
Pests And Diseases ◽  
Cocos Nucifera L ◽  
Tissue Culture Techniques

Abstract Coconut palm (Cocos nucifera L.) is one of the most important tropical species used by man, known as “tree of life”. In recent decades, with the expansion of coconut growing areas, limitations such as the occurrence of pests, uniformity of crops, adaptation to different ecosystems and others have affected the production and longevity of coconut trees. This review describes the major advances in propagation techniques of coconut palm, conventionally, by seeds and through plant tissue culture techniques from the mid-twentieth century onwards, as well as phytosanitary aspects that should be considered to mitigate the spread of pests and diseases.

Controlling manganese deficiency in sugarbeet with foliar sprays

1991 ◽  
Vol 116 (3) ◽  
pp. 351-358 ◽  
Author(s):  
P. J. Last ◽  
K. M. R. Bean
Keyword(s):  
Field Experiments ◽  
Early Summer ◽  
The Other ◽  
Manganese Deficiency ◽  
Manganese Sulphate ◽  
Mn Deficiency ◽  
Deficiency Symptoms ◽  
Foliar Sprays ◽  
Mn Concentrations

SUMMARYField experiments in 1987 and 1988 on peaty-loam, Mn-deficient soils of the Adventurers series in Cambridgeshire, UK, tested the response of sugarbeet to three forms of manganese fertilizer supplied as foliar sprays. The influence of a wetter and an adjuvant on manganese absorption and growth was also investigated.Cutonic and chelated forms of Mn, when applied at standard rates, were inefficient at increasing Mn concentrations in plants and alleviating deficiency symptoms during early summer. Mn concentrations in foliage increased rapidly after spraying with manganese sulphate, and most of the deficiency symptoms disappeared. These benefits were usually enhanced when manganese sulphate sprays were used with an adjuvant.Averaged over both years, yield without Mn was 8·83 t sugar/ha; the largest yield, 9·56 t/ha, was obtained with manganese sulphate plus adjuvant. Smaller benefits were obtained with the other forms of Mn. The adjuvant, when used with chelated Mn, appeared to depress sugar yields in both years. The likelihood of reducing the number of sprays required to control Mn deficiency on Fen soils was improved by using an adjuvant with manganous sulphate sprays.

scholarly journals Imidacloprid Concentrations in Green Ash (Fraxinus pennsylvanica) Following Treatments with Two Trunk-Injection Methods

2006 ◽  
Vol 32 (3) ◽  
pp. 126-129
Author(s):  
Mark Harrell
Keyword(s):  
Untreated Control ◽  
Fraxinus Pennsylvanica ◽  
Green Ash ◽  
Cambial Zone ◽  
Injection Methods ◽  
Trunk Injection ◽  
And Control

Two imidacloprid trunk-injection products (Pointer TMand Imicide®) were applied to green ash (Fraxinus pennsylvanica Marsh.) in May and July to compare the concentrations of imidacloprid in sap and leaf and trunk tissues after the injections. Sap samples were extracted from shoots 0, 3, 7, 30, 60, and 90 days after treatment and analyzed for imidacloprid. Dry leaf samples were analyzed for imidacloprid at 30 and 90 days after treatment. Combined xylem and cambial zone samples were analyzed for imidacloprid at 90 days after treatment at 0.5 m (1.65 ft) and 1.0 m (3.3 ft) above the injection sites. Sap imidacloprid concentrations in trees treated in May with Pointer were significantly higher than the untreated control at 7 days after treatment (P < 0.05) but were not significantly different from the control on other days or different from Imicide on any day. Sap imidacloprid levels in trees treated in July with Pointer were significantly higher than the control at 30 days after treatment but were not significantly different from Imicide. Dry leaf imidacloprid levels in trees treated with Pointer were significantly higher than the Imicide and control treatments at 30 and 90 days after treatment. Xylem and cambial zone imidacloprid levels in trees treated with Pointer were significant higher than the Imicide and control treatments at 90 days after treatment at 1.0 m (3.3 ft) above the injection sites but were not significantly higher at 0.5 m (1.65 ft). No imidacloprid levels from Imicide were significantly different from those in the untreated control trees.

scholarly journals Genes Involved in Lipid Metabolism in Coconut

2021 ◽  
Author(s):  
Wei Xia
Keyword(s):  
Fatty Acid ◽  
Lipid Metabolism ◽  
Lauric Acid ◽  
Cocos Nucifera ◽  
Evolutionary Relationship ◽  
Coconut Oil ◽  
Coconut Palm ◽  
Acyl Donor ◽  
Fatty Acid Accumulation

Coconut palm (Cocos nucifera L) is an economically important monocot plant grown in tropical and subtropical regions. Coconut oil is stored in a solid endosperm and has 47.48–50.5% fatty acid component as lauric acid (C12:0). Present research showed that acyl-acyl carrier protein thioesterases (FatA/B) and lysophosphatidic acid acyltransferase (LAAPT) are key enzymes determining medium-chain fatty acid accumulation in coconut oil. Among five CnFatB genes, CnFatB3 expressed specifically in endosperm and in vitro experiment showed that this gene made mainly lauric acid (C12:0) and tetradecenoic acid (C14:1). Overexpression of CnFatB3 in Arabidopsis increased the amounts of C12:0 and C14:0 in transgenic plant. CnLPAAT gene that is expressed specifically in coconut endosperm showed a preference for using acyl-CoAs containing C10:0, C12:0, and C14:0 acyl groups as acyl-donor substrates. Coconut and oil palm are closely related species with approximately 50% lauric acid (C12:0) in their endosperm. The two species have a close evolutionary relationship between predominant gene isoforms and high conservation of gene expression bias in the lipid metabolism pathways. Moreover, since no stable transformation system has been constructed in coconut palm, gene function validations have been done in vitro, or genes transformed into a heterologous system.

scholarly journals Uptake and Distribution of Boron in Coconut and Paurotis Palms

HortScience ◽  
2011 ◽  
Vol 46 (12) ◽  
pp. 1683-1686 ◽  
Author(s):  
Timothy K. Broschat
Keyword(s):  
Cocos Nucifera ◽  
Distribution Patterns ◽  
Coconut Palm ◽  
Soil Treatment ◽  
Leaf Axil ◽  
Natural Distribution ◽  
Single Leaf

Natural distribution patterns of boron (B) among leaves within a canopy, among leaflets within a leaf, and within single leaflets were determined for coconut palm (Cocos nucifera L.) and within leaves for paurotis palm [Acoelorrhaphe wrightii (Griseb. & H. Wendl.) Becc.]. Leaf B concentrations did not vary significantly among leaves within the canopy or among leaflets within a single leaf for coconut palm, but basal leaflets of paurotis palm had higher B concentrations than central leaflets. Boron concentrations were significantly higher toward the tips of individual leaflets in both species. Application of Solubor to the soil significantly increased leaf B concentrations in all leaves of coconut palm after 2 months as well as in new leaves produced up to 6 months later. Application of Solubor as a leaf axil drench was much less effective in increasing foliar B concentrations than soil treatment.

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