scholarly journals RESPONSE OF GIZA 90 COTTON CULTIVAR TO WATER STRESS AND NITROGEN LEVELS WITH BORON FLOIAR APPLICATION

2012 ◽  
Vol 3 (10) ◽  
pp. 2525-2539
Author(s):  
F. Hamed
Keyword(s):  
Water Stress ◽  
Nitrogen Levels ◽  
Cotton Cultivar

Responses of two hybrid Populus clones to flooding, drought, and nitrogen availability. I. Morphology and growth

1992 ◽  
Vol 70 (11) ◽  
pp. 2265-2270 ◽  
Author(s):  
Zhijun Liu ◽  
Donald I. Dickmann
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Nitrogen Availability ◽  
Carbon Allocation ◽  
Hybrid Poplar ◽  
Leaf Expansion ◽  
Root Production ◽  
Leaf Initiation ◽  
Stem Biomass ◽  
Nitrogen Levels

Repeated progressive drought and flooding stress were imposed on hybrid poplar clones Populus × euramericana 'Eugenei', and Populus tristis × Populus balsamifera ‘Tristis’ grown in pots in a greenhouse under two nitrogen levels. In both clones the rate of leaf initiation was promoted only in high-N plants subjected to minimum water stress. Water stress alone did not retard the rate of leaf initiation, but it significantly reduced leaf expansion of 'Eugenei', whereas only flooding led to smaller leaves in 'Tristis'. The addition of N stimulated leaf expansion, leaf chlorophyll and N concentrations, and leaf and stem biomass production across soil moisture levels, but the greatest effect of N was associated with minimum water stress. High N altered carbon allocation towards the aboveground portions, leading to lower root to shoot ratios. High N also appeared to stimulate initiation of fine roots. Soil moisture determined the amount of biomass that accumulated in roots, with highest root production in well-watered pots and lowest in flooded pots, with the droughted treatment in between. Leaves became thinner as soil moisture decreased from flooding. Stem biomass of 'Tristis' declined more under flooding than under drought, whereas 'Eugenei' displayed a greater reduction of stem biomass in droughty than in flooded soil. Key words: water stress, nitrogen, leaf and root morphology, root to shoot ratio, biomass, Populus, flooding.

Associations between host-plant nitrogen and infestations of the sugarcane borer, Eldana saccharina Walker (Lepidoptera: Pyralidae)

1989 ◽  
Vol 79 (3) ◽  
pp. 489-506 ◽  
Author(s):  
P. R. Atkinson ◽  
K. J. Nuss
Keyword(s):  
Water Stress ◽  
Field Trials ◽  
Eldana Saccharina ◽  
Plant Nitrogen ◽  
Feeding Sites ◽  
Nitrogen Levels ◽  
Natural Hosts ◽  
Cane Weight ◽  
Lepidoptera Pyralidae ◽  
Plant Trials

AbstractInfestations of Eldana saccharina Walker in South Africa are higher in intensively-grown than in peasant-grown sugarcane, and are worse in water-stressed plants. Although field trials showed negligible increases in the incidence of the pest with applied nitrogen, the degree in which the degree of water stress could not be controlled. Pot-plant trials, in which the degree of water stress was controlled as well as the amount of fertilizer, showed that the combination of nitrogen with stress resulted in increased survival of larvae and greatly increased biomass with shortened development times. Adults did not appear to choose stressed or fertilized plants in preference to normal or unfertilized ones. In every case, whether in the field or in insectary trials, increased infestation levels were associated with increased stalk total nitrogen. Amino acid determinations showed that the balance of individual acids did not appear to alter but that the balance of individual acids did not appear to alter but that glyphosate ripener had a similar effect to water stress, increasing all amino acids together. Infestations in older cane were disproportionately higher than in younger cane, weight for weight, despite reduced levels of stalk nitrogen. This anomaly may be due to the presence of phenolic compounds in younger cane, or in cane tops. Levels of nitrogen are much higher in the feeding sites of the insect in natural host-plants than in cane stalks, and the fecundity of feral moths natural hosts appeared to be higher than that of moths from sugarcane. The insect appears to have invaded sugarcane when stalk nitrogen levels reached sufficiently high levels for its survival as a result of intensive cultivation.

Responses of Drip Irrigated Bell Pepper to Water Stress and Different Nitrogen Levels with or without Mulch Cover

2003 ◽  
Vol 26 (2) ◽  
pp. 263-277 ◽  
Author(s):  
Halil Kirnak ◽  
Cengiz Kaya ◽  
David Higgs ◽  
Ismail Tas
Keyword(s):  
Water Stress ◽  
Bell Pepper ◽  
Nitrogen Levels ◽  
Mulch Cover

scholarly journals Nitrogen Metabolism in Adaptation of Photosynthesis to Water Stress in Rice Grown under Different Nitrogen Levels

2017 ◽  
Vol 8 ◽  
Author(s):  
Chu Zhong ◽  
Xiaochuang Cao ◽  
Jijie Hu ◽  
Lianfeng Zhu ◽  
Junhua Zhang ◽  
...  
Keyword(s):  
Water Stress ◽  
Nitrogen Metabolism ◽  
Nitrogen Levels

scholarly journals Germination of cotton cultivar seeds under water stress induced by polyethyleneglycol-6000

2011 ◽  
Vol 68 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Carlos Henrique Salvino Gadelha Meneses ◽  
Riselane de Lucena Alcântara Bruno ◽  
Pedro Dantas Fernandes ◽  
Walter Esfrain Pereira ◽  
Leonardo Henrique Guedes de Morais Lima ◽  
...  
Keyword(s):  
Water Stress ◽  
Seed Viability ◽  
Accelerated Aging ◽  
Germination Percentage ◽  
Randomized Design ◽  
Physiological Quality ◽  
Differential Viability ◽  
Osmotic Potentials ◽  
Cotton Cultivar

The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the least sensitive to the tested osmotic potentials, both in terms of germination and of vigor. The 'BRS-201' cultivar was mostly affected by the viability and vigor tests under water deficit conditions. Differential viability and vigor between cultivars were observed under the water stress levels.

scholarly journals Effect of water stress on the growth of Arachis pintoi plants under different nitrogen levels

2013 ◽  
Vol 42 (3) ◽  
pp. 149-154
Author(s):  
Rita Manuele Porto Sales ◽  
Daniela Deitos Fries ◽  
Paulo Bonomo ◽  
Aureliano José Vieira Pires ◽  
Cleide Nascimento Campos ◽  
...  
Keyword(s):  
Water Stress ◽  
Nitrogen Levels ◽  
Arachis Pintoi ◽  
Effect Of Water

scholarly journals Optimization of Nitrogen Dose under Different Irrigation Levels in Maize (Zea mays L.) during Post Monsoon Season at Rajendranagar, Hyderabad, India

2020 ◽  
pp. 43-54
Author(s):  
B. Soujanya ◽  
B. Balaji Naik ◽  
M. Uma Devi ◽  
T. L. Neelima ◽  
Anima Biswal
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Grain Yield ◽  
Plant Height ◽  
Nitrogen Uptake ◽  
Monsoon Season ◽  
Moisture Condition ◽  
Soil Moisture Condition ◽  
Nitrogen Levels ◽  
Post Monsoon Season

A field experiment was conducted at Agro Climate Research Center, Rajendranagar, Hyderabad, India during post monsoon season of 2019-20 with an objective to optimize the nitrogen dose under varied degrees of water stress environment. The experiment was laid out in split plot design replicated thrice with three irrigation scheduling (60%DASM, 40%DASM and 20%DASM) as main plots and three nitrogen levels (90, 180 and 240 kg of nitrogen ha-1) as sub plots. The results indicated that, at 20% DASM, with increasing nitrogen dose from 90 to180 and further 240 kg ha-1, the plant height and biomass increased significantly. Whereas a significant response in terms of the LAI, number of grains row-1, grain and stover yields and nitrogen uptake by plant was observed up to 180 kg N ha-1.Under deficit soil moisture condition (60% DASM) the maximum plant height (141.5cm), LAI (2.93), biomass (222.3 g plant-1), number of grains row-1 (35.3) test weight (24.1 g), grain yield (4930 kg ha-1), stover yields (7996kg ha-1) and nitrogen uptake by plant was recorded with low nitrogen dose of 90 kg N ha-1 and all these parameters were decreased with increasing nitrogen dose. The concentration of nitrogen in leaf, stem and grain was more under deficit soil moisture condition (60% DASM) and was decreased with reliving plant water stress by scheduling irrigation at 40% DASM and 20% DASM. This investigation evidences the need of nitrogen optimization under varied degree of moisture availability. Under deficit irrigated situation, lower dose of nitrogen is sufficient for optimum yield. Whereas under sufficient water availability, the beneficial effect increased nitrogen levels can be exploited for higher grain yield in maize.

scholarly journals Growth and Yield of Basmati and Traditional Aromatic Rice As Influenced By Water Stress and Nitrogen Level

2014 ◽  
Vol 10 (2) ◽  
pp. 52-62 ◽  
Author(s):  
MA Mannan ◽  
MSU Bhuiya ◽  
MIM Akhand ◽  
MM Saman
Keyword(s):  
Water Stress ◽  
Grain Yield ◽  
Rice Variety ◽  
Reproductive Stage ◽  
Nitrogen Level ◽  
Yield Reduction ◽  
Growth Stages ◽  
Optimum Level ◽  
Spikelet Sterility ◽  
Nitrogen Levels

The experiment was done at the Bangladesh Rice Research Institute Farm, Gazipur during Boro season to determine the critical growth stage where water stress affect on yield reduction and to find out optimum level of nitrogen and to select stress tolerance nitrogen responsive rice variety. Water stress was imposed at i) vegetative stage, ii) reproductive stage, iii) grain filling stages and compared with iv) control (no water stress). Forty day-old seedlings of rice variety; BasmatiPNR, Basmati-D and Kalijira were transplanted on 15 December. Plant spacing was maintained at 20cm x15cm. Nitrogen was top dressed at 0, 70, 105 and 140 kg ha-1 at different growth stages. Increased spikelet sterility, resulting low grain yield. The highest grain yield was observed in stress free crop irrespective of nitrogen levels. However, grain yield increased with the increase of nitrogen levels irrespective of water stress. In the high fertilized crop, percentage of spikelet sterility increased with the increase water stress especially at the reproductive stage. Among the tested varieties the short stature Basmati PNR performed well by reducing spikelet sterility irrespective of nitrogen level and water stress conditions. DOI: http://dx.doi.org/10.3329/jsf.v10i2.17958 J Sci Found, 2012;10(2):52-62

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