Osmotic Potential of Winter Wheat Crowns for Comparing Cultivars Varying in Winterhardiness

1989 ◽  
Vol 81 (2) ◽  
pp. 159-163 ◽  
Author(s):  
J. T. DeNoma ◽  
G. A. Taylor ◽  
H. Ferguson
Euphytica ◽  
1993 ◽  
Vol 65 (1) ◽  
pp. 9-14 ◽  
Author(s):  
E.W. Storlie ◽  
L.E. Talbert ◽  
G.A. Taylor ◽  
H.A. Ferguson ◽  
J.H. Brown

1990 ◽  
Vol 70 (2) ◽  
pp. 431-441 ◽  
Author(s):  
M. H. ENTZ ◽  
D. B. FOWLER

Field studies were established at four locations in 1985 and 1986 to study the physiological responses of two winter wheat (Triticum aestivum L.) cultivars under different water and nitrogen regimes. Measurements of leaf water potential (ψ1), osmotic potential (π) and leaf conductance (g1) were made on individual leaves at regular intervals throughout the growing season. Values of ψ1 ranged from −1.0 to −4.5 MPa, indicating that winter wheat in Saskatchewan experiences moderate to extreme levels of water stress. Leaf ψ1 levels generally decreased as evaporative demand for water increased. Osmotic potential values ranged from −1.0 to −4.0 MPa while ψp (calculated as ψp = ψ1 − π) ranged from −0.4 to 0.9 MPa. Despite strong osmotic adjustment in response to stress, positive ψp was not always maintained. Additional water through limited irrigation increased both ψ1 and π but did not significantly affect ψp. Fertilizer N additions consistently decreased both ψ1, and π, and in some cases ψp levels. The tall cultivar Norstar displayed greater turgor maintenance than the semidwarf cultivar Norwin under both stress and nonstress conditions. Leaf conductance ranged from approximately 0.04 – 1.10 cm s−1 and was higher in irrigated plots. Fertilizer N additions often decreased g1 per unit area of leaf. On a leaf area basis, g1 for Norwin at high N levels was often greater than for Norstar. However, similar g1 vs. ψ1 responses for Norwin and Norstar indicated a similar stomatal response to increased water stress for these cultivars.Key words: Drought stress, nitrogen, leaf conductance, turgor potential


1979 ◽  
Vol 71 (1) ◽  
pp. 31-36 ◽  
Author(s):  
G. S. Campbell ◽  
R. I. Papendick ◽  
E. Rabie ◽  
A. J. Shayo‐Ngowi

1972 ◽  
Vol 50 (3) ◽  
pp. 677-680 ◽  
Author(s):  
D. G. Green

Increased frost survival after exposure of winter wheat seedlings to solutions of glucose, sucrose, or mannitol was not explained simply by changes in the osmotic potential of the leaves. In some cases either an increase in percentage total carbohydrate and reducing sugars, or a slight decrease in leaf water content increased frost survival. Because of the dependency of osmotic potential and percentage total carbohydrate and reducing sugars on the plant's water status, it is difficult to evaluate their individual importance to frost survival. Because maleic hydroxide is residual it does not have application as a short-term (1-week) growth retardant for increasing frost tolerance in winter wheat.


1981 ◽  
Vol 59 (9) ◽  
pp. 1717-1721 ◽  
Author(s):  
N. J. Tyler ◽  
L. V. Gusta ◽  
D. B. Fowler

Crowns of winter wheat plants water stressed with polyethylene glycol (PEG) (molecular weight 20 000) prior to hardening were more cold hardy than tender crowns or crowns hardened for 2 days (p ≤ 0.05). After 16 days of hardening, plants from all treatments reached the same level of hardiness. Winter wheat crowns water stressed with PEG (210 g/L) for either 0,5, or 21 days reached the same level of hardiness after 2 days of acclimation. In both short- and long-term stress studies, the crown moisture content of the stressed plants was lower (p ≤ 0.05) than that of the controls prior to acclimation. With increasing hardiness both leaf osmotic potential and crown moisture content decreased (p ≤ 0.05). Short-term water stress also resulted in an increase in sugars, specifically sucrose (p ≤ 0.05) prior to cold hardening. However the total sugar content did not parallel the increase in hardiness.Changes in several metabolic parameters were also considered. Significant correlations were found in both studies between the LT50 and osmotic potential, moisture content, and dry weight. Most of the variability in LT50 could be explained by changes in leaf osmotic potential and crown moisture content.


1994 ◽  
Vol 92 (3) ◽  
pp. 511-515 ◽  
Author(s):  
Kang Chong ◽  
Li-Ping Wang ◽  
Ke-Hui Tan ◽  
Hua-Liang Huang ◽  
Hou-Guo Liang

Agronomie ◽  
1983 ◽  
Vol 3 (6) ◽  
pp. 537-544 ◽  
Author(s):  
Jean-François LEDENT ◽  
Volkmar STOY ◽  
Helena AIRAKSINEN ◽  
Tomas PATKAI

Author(s):  
Georgiy Gulyuk ◽  
Aleksey Ivanov ◽  
Yuri Yanko

Current situation and agricultural management on the non-black earth area of Russia arebeing gradually worsen by the negative natural factors such as a significant increase of weather based climatic abnormal risks, deterioration of agro-meliorative conditions of agricultural lands because of colonization by tree and shrubbery vegetation and secondary bog formation, hidden degradation of soil fertility. When combined with functional loss of ameliorative complex and meliorative systems amortization, regional agriculture adaptation possibilities were rapidly limited. Production shortfall due no abnormal weather conditions for particular field crops was 19…48% during last five years, level of business realization of bioclimatic potential on a field was decreased by 7…12%.The complete realization of regional agricultural adaptive potential to weather based climatic changes and limitation of greenhouse gases emissions is possible on a basis of regeneration ofalll functions and aspects of ameliorative complex management. Toward this goal the coordinated actions of federal and regional management of Agricultural Complex, Scientific and Educational institutions, project foundations and managers are needed in a relation to human resources, scientific and regulatory supply. Any incomplete treatment in these fields inherent in visual negative consequences for food security and social economic development of rural areas of non-black earth zones not only at the current historical moment, but in a future also. Fundamental influence of solving of these problems deserves to scientific supply of innovative ameliorative complex, renewal of which should be based on principals of resources and energy preservation, nature management, computerization and digitalization management. During a long term research it was established that increase of average vegetation period temperature by lоСhas increased productivity of winter wheat, barley and summer wheat in average on 0,7 tons per ha, winter wheat and oat on 0,4 tons per ha, potatoes – 8,2 tons per ha, edible roots-6,4 tons per ha, cabbage 9,8 tons per ha, dry basis of herbage of multi and one age grasses–0,5 and 0,7 tons per ha. Increase of СО2 Concentration from 0,35 to 0,45% during last twenty years contributed into grow of yield in regional agriculture which can be estimated as 0,3 tons per ha per measure; searching remedy for agroclimatical risks decreasing production became drainage and irrigation systems (decrease 3…5 times);new method of reclamation of abandoned areas with transformation of biomass of tree and shrubbery vegetation into biochar makes it possible to decrease СО2 emissions up to times and get an adverse balance of СО2;secondary reclamation of lands covered by trees and shrubbery on area of 22ha used for vegetables and area of 37ha used for forage crops could supply a farmer with work and revenue sufficient for maintenance of one child what is on the major facts of population declaim in rural areas.


2020 ◽  
pp. 181-191
Author(s):  
M. Tkachenko ◽  
N. Borys ◽  
Ye. Kovalenko

The research aims to establish the eff ectiveness of granular chalk use produced by «Slavuta-Calcium» Ltd. under growing Poliska–90 winter wheat variety, changing the physicochemical properties of grey forest soil and the wheat productivity. It also aims to establish optimal dosis of «Slavuta-Calcium» granular chalk as the meliorant and mineral fertilizer for grey forest soil in the system of winter wheat fertilization. In the temporary fi eld studies, various doses of nutrients N60–90–120P30–45–60K60–90–120 combined with «Slavuta–Calcium» granular chalk in a dose of Ca230–460–690 kg/ha of the active substance were studied against the background of secondary plowing of rotation products – soybean biomass that averaged 2.34 t/ha. Granular chalk is a modern complex highly eff ective meliorant with the content of Ca – 37.7 and Mg – 0.2 %, the mass fraction of carbonates (CaCO3 + MgCO3) makes at least 95 %. It is characterized by a high level of solubility when interacting with moisture in soil. It has a form of white granules, the mass fraction of 4.0–6.0 mm in size granules makes not less than 90 % and the one of 1.0 mm in size makes less than 5 %. Reactivity – 97 %. The granular chalk is advisable to apply on acidic soils, as a highly concentrated calcium-magnesium fertilizer, with the former as the dominant fertilizer, to optimize the physicochemical properties of the soil, as well as the plant nutrition system, in particular, increasing the availability of an element for assimilation by plants and as long-term ameliorants. The eff ectiveness of the use of mineral fertilizers, in particular acidic nitrogen on highly and medium acidic soils, after chemical reclamation is increased by 30–50 %, and slightly acidic by 15–20 %. The increase in productivity of crops from the combined eff ects of nutrients and chalk granulated is usually higher than when separately applied. The eff ectiveness of the integrated action of these elements is manifested in the growth of plant productivity and the quality of the resulting products, as well as the optimization of physical chemical properties and soil buff ering in the long term. In order to optimize the physicochemical properties of the arable layer of gray forest soil and the productive nutrition of agricultural crops, winter wheat, in particular, biogenic elements should be used in doses N60-90-120P30-45- 60K60-90-120 with granulated chalk «Slavuta-Calcium» in doses of Ca230-460-690 kg/ha of active substance. Granulated chalk obtained as a result of industrial grinding of solid sedimentary carbonate rocks of natural origin, subsequently under the infl uence of the granulation process of the starting material contains Ca and Mg carbonates of at least 95 %, dense granules which facilitates convenient mechanized application, as well as chalk suitable for accurate metered application on the quest map. Key words: granular chalk, gray forest soil, chemical reclamation, crop productivity.


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