EFFET DU MAGNÉSIUM ET DU pH DU SOL SUR LA LUZERNE CULTIVÉE EN SERRE DANS TROIS TYPES DE SOL DU QUÉBEC

1980 ◽  
Vol 60 (2) ◽  
pp. 275-284 ◽  
Author(s):  
J. L. DIONNE
Keyword(s):  
Medicago Sativa ◽  
Soil Ph ◽  
Dry Weight ◽  
Weight Basis ◽  
Soil Types ◽  
Yield Increase ◽  
Medicago Sativa L ◽  
Mg Content

Aflalfa (Medicago sativa L. ’Saranac’) was grown under greenhouse conditions in order to determine changes in magnesium (Mg) response and availability following variation in soil pH. The rates of Mg applications were 0, 25, 50, 100 and 200 ppm of Mg calculated on soil dry weight basis. Soil pH was adjusted to 5.0 (or original) 6.0, 6.5 and 7.5. A 40% yield increase was recorded on Greensboro loam following Mg fertilization. The increase in yields due to Mg was 23% on the two others soil types. The Mg contents of plant and soil increased with rate of Mg applied to soil. In general, the response of alfalfa was increased by liming soils and the Mg content of alfalfa was decreased. The availability of Mg in soils was also lowered by liming. The Mg requirement of soils varied from 25 to 100 ppm depending upon pH and soil types.

The influence of the lucerne bud mite (Eriophyes medicaginis Keifer) on the growth of lucerne

1981 ◽  
Vol 32 (5) ◽  
pp. 773 ◽  
Author(s):  
PM Ridland ◽  
GM Halloran
Keyword(s):  
Medicago Sativa ◽  
Dry Weight ◽  
Stem Length ◽  
Infestation Level ◽  
Axillary Shoots ◽  
Two Temperatures ◽  
Medicago Sativa L ◽  
Extent Of Damage ◽  
Initial Infestation ◽  
Damage Symptoms

The influence of Eriophyes medicaginis on the growth of lucerne (Medicago sativa L.) was studied at four temperatures (15, 20, 25 and 29�C) at an initial infestation level of 10 mites per seedling, and at two temperatures (20 and 29�C) with four initial levels of infestation (2, 5, 10 and 20 mites per seedling). At 25� and 29�C, infestation with 10 mites per seedling significantly reduced dry weight of tops, stem length and the development of axillary shoots within 22 days of infestation. In this period, the numbers of mites increased 16-fold at 29OC, ninefold at 25�C and sixfold at 20�C, but there was no increase at 15�C. The extent of damage caused by mites at 20�C appeared to vary with the differences in growth of the plants under different photoperiods. Under a short photoperiod (10.3 h) where no axillary shoots developed on either infested or control plants, the extent of damage due to mite infestation was much higher than under a longer photoperiod (13.2 h) where axillary shoots developed on all seedlings. Damage symptoms on leaves of infested plants included chlorotic patches (mainly at 20� and 25�C), agate-like banding (29�C) and a waxy mottle (15�C).

Effect of silicon on the morphology of shoots and roots of alfalfa (Medicago sativa)

2006 ◽  
Vol 46 (9) ◽  
pp. 1161 ◽  
Author(s):  
Z. G. Guo ◽  
H. X. Liu ◽  
F. P. Tian ◽  
Z. H. Zhang ◽  
S. M. Wang
Keyword(s):  
Medicago Sativa ◽  
Root Biomass ◽  
Dry Weight ◽  
Reproductive Period ◽  
Forage Yield ◽  
Root Volume ◽  
Top Soil ◽  
Medicago Sativa L ◽  
Si Content ◽  
Secondary Roots

A silicon (Si)-deficient top soil was used in a pot experiment to investigate the effect of Si application on the shoot and root morphology of alfalfa (Medicago sativa L.). Silicon was applied to the alfalfa plants at 6 different rates (0, 0.025, 0.05, 0.10, 0.20, 0.30 g/kg), and each treatment was replicated 6 times. This study indicated that the Si content of roots and shoots increased significantly (P<0.05) with increasing Si concentration in the soil, and that the Si content of roots was greater than that of shoots. Plants treated with Si had increased leaf area, height, forage yield and shoots per plant during the reproductive period in comparison with controls. The application of Si also increased root volume, the number of secondary roots and root biomass. The effects of Si application were greater on roots than on shoots. The ratio of shoot to root dry weight was below 1.62 when Si was applied to plants and 1.91 without Si application. Overall, overcoming available Si deficiency resulted in a significant increase in shoot and root growth.

scholarly journals Effect of Salinity on Nodulation, Glutamine Synthetase and Glutamate Synthase Activity in Nodules of Alfalfa (Medicago sativa L.)

2015 ◽  
Vol 48 (4) ◽  
pp. 61-70
Author(s):  
O. Younesi ◽  
A. Moradi
Keyword(s):  
Glutamine Synthetase ◽  
Medicago Sativa ◽  
Sinorhizobium Meliloti ◽  
Glutamate Synthase ◽  
Dry Weight ◽  
Ammonium Assimilation ◽  
Solution Culture ◽  
Saline Stress ◽  
Medicago Sativa L ◽  
Growth Analyses

Abstract Bami cultivar of alfalfa (Medicago sativa) was inoculated with salt-tolerant Sinorhizobium meliloti in solution culture with different salt concentrations (0, 50, 75 and 100 mmoles 1-1NaCl) added immediately at the time of inoculation. The results indicated that S. meliloti formed an infective and effective symbiosis with alfalfa under saline and nonsaline conditions. Salinity significantly decreased shoot and root dry weight, nodule weight and mean nodule weight. Roots were more sensitive than shoots, and N2 fixation was more sensitive to salinity than was plant growth. Analyses of ammonium assimilating enzymes in the nodule showed that glutamine synthetase appeared to be more tolerant to salinity than glutamate synthase, and that it limits ammonium assimilation under saline stress.

scholarly journals 947 SCREENING MARIGOLD CULTIVARS FOR SUSCEPTIBILITY TO IRON TOXICITY

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 569d-569 ◽  
Author(s):  
Nancy K. Todd
Keyword(s):  
Soil Ph ◽  
Spider Mite ◽  
Dry Weight ◽  
Iron Toxicity ◽  
Weight Basis ◽  
Tagetes Erecta ◽  
Plant Leaves ◽  
Nutritional Disorder ◽  
Initial Symptoms ◽  
Chlorotic Mottling

Marigolds are susceptible to a specific nutritional disorder known as “bronze speckling”. It has been reported that the disorder is caused by excessive uptake of iron by the plant, which may be due to high levels of Fe in the soil solution or low soil pH. In this experiment, 12 cultivars of marigold (Tagetes erecta and T. patula) were grown using increasing levels of Fe (0, 5, 15, and 20 mg/l) from Fe DTPA. In the susceptible cultivars, symptoms were observed within 5 days of initial treatment and appeared as a chlorotic mottling. Initial symptoms resembled spider mite damage on older leaves, which gradually became bronze colored in appearance, and finally became necrotic. Downward cupping of leaves was observed in severely affected plants. Severity of necrosis and percent of plant leaves affected (dry weight basis) were evaluated to determine susceptibility of the different cultivars to the disorder. There was a direct correlation between increasing concentration of Fe and occurrence and severity of symptoms. The most susceptible to least susceptible cultivars were determined to be: First Lady, Inca, Discovery, Galore, Pineapple Crush, Perfection Excel, Voyager All Seasons, Nugget, Zenith, Voyager F1 and Diamond Jubilee.

Root and crown characteristics of alfalfas varying in fall dormancy

1994 ◽  
Vol 74 (1) ◽  
pp. 125-127 ◽  
Author(s):  
N. A. Juan ◽  
C. C. Sheaffer ◽  
D. K. Barnes
Keyword(s):  
Medicago Sativa ◽  
Key Words ◽  
Dry Weight ◽  
Nonstructural Carbohydrate ◽  
Shoot Number ◽  
Fall Dormancy ◽  
Crown Morphology ◽  
Medicago Sativa L ◽  
Crown Characteristics ◽  
Alfalfa Root

We compared root and crown characteristics of five alfalfa (Medicago sativa L.) entries which differed in fall dormancy. Alfalfas were subjected to bud or mid-bloom harvests. The most consistent entry effect occurred for root and crown dry weight and root total nonstructural carbohydrate (TNC) concentrations. Root TNC concentration was highest and root and crown weight were greatest for the nondormant and least in the most dormant entries. Entries did not consistently differ in crown bud numbers, shoot number, or shoot origin. In October, the number of elongated crown buds were greater for a non-fall dormant alfalfa Nitro than for the most fall dormant alfalfa. Key words: Alfalfa, root and crown morphology, fall dormancy, root carbohydrates

scholarly journals Bioavailability of microcystin-LR in two different soil types to the legume Alfalfa Medicago sativa L.

2021 ◽  
Author(s):  
M. Esterhuizen ◽  
N. Schmitner ◽  
S. Pflugmacher
Keyword(s):  
Adverse Effects ◽  
Medicago Sativa ◽  
Ecological Risk ◽  
Soil Type ◽  
Clayey Loam ◽  
Silty Sand ◽  
Soil Types ◽  
Spiked Soil ◽  
Medicago Sativa L ◽  
Insight Into

AbstractThe adverse effects of exposure to microcystins in terrestrial crops have been well documented. However, the retention and bioavailability of microcystin-LR, one of the most prevalent cyanotoxins, from soil to plants, is poorly understood. In the present study, the amount of free microcystin-LR from two soil types, a silty sand and clayey loam, with exposure to three toxin concentrations and time was investigated. Using the two soil types, the effects on Medicago sativa (Alfalfa) growth after microcystin-LR exposure via irrigation with spiked water and pre-spiked soil was investigated and the amount of microcystin-LR taken up by the plant quantified. After 3 weeks of growth, the amount of free microcystin-LR remaining in the two soil types with each treatment was quantified. The results indicated that in clayey loam more microcystin-LR is bound to the soil. However, the growth of Alfalfa was only affected in the clayey loam with microcystin/LR exposure via irrigation. Nevertheless, microcystin-LR was detected in Alfalfa grown in both soil types exposed by both irrigation and via pre-spiked soil. Interestingly, more microcystin-LR remained in the silty sand after 3 weeks; yet, more microcystin-LR was taken up by the Alfalfa grown in the silty sand, with a larger concentration in the roots compared to the shoots. The results indicate that the soil type substantially influences the bioavailability and uptake of microcystin-LR and present some insight into the ecological risk posed by microcystin-LR.

scholarly journals Study of the allelopathic effects of Medicago sativa on the germination characteristics of Secale montanum

2021 ◽  
Vol 78 (2) ◽  
pp. 34
Author(s):  
Esmaeil NABIZADEH ◽  
Mahdieh MEMARI ◽  
Khadijeh AHMADI
Keyword(s):  
Medicago Sativa ◽  
Dry Weight ◽  
Initial Growth ◽  
Allelopathic Potential ◽  
Aerial Parts ◽  
Agricultural College ◽  
Germination Characteristics ◽  
Medicago Sativa L ◽  
Allelopathic Effects ◽  
Secale Montanum

This study investigated the allelopathic effects of Medicago sativa L. on the germination characteristics of weed rye (Secale montanum L.) Guss. In order to study the allelopathic effects of different concentrations of aqueous extract (0, 10, 20 and 30%) of different M. sativa parts (root, leaves, stem and aerial parts of the plant including (stems, leaves and flowers) on initial growth of rye (S. montanum) seedlings a factorial experiment arranged in RCB design was carried out with three replications in the greenhouse of Agricultural College, Mahabad Islamic Azad University in 2017. The greenhouse data showed that the plant height, root and biomass dry weight of the weed decreased so that the declining trend had a significant effect (p≤0.05) on all traits of rye studied in the present experiment. Among the aqueous extracts of M. sativa that of the root had the greatest allelopathic potential. 

Nodulation of lucerne (Medicago sativa L.) in an acid soil: pH dynamics in the rhizosphere of seedlings growing in rhizotrons

1990 ◽  
Vol 126 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Jan W. M. Pijnenborg ◽  
T. A. Lie ◽  
A. J. B. Zehnder
Keyword(s):  
Medicago Sativa ◽  
Soil Ph ◽  
Acid Soil ◽  
Medicago Sativa L
Sign in / Sign up

Export Citation Format

Share Document