scholarly journals The study of humic acid foliar application on physiological and biochemical changes in wheat under irrigation withholding at different growth stages

2016 ◽  
Vol 5 (1) ◽  
pp. 1-7 ◽  
Author(s):  
HR Tohidi
Keyword(s):  
Humic Acid ◽  
Foliar Application ◽  
Stem Elongation ◽  
Research Field ◽  
Growth Stages ◽  
Physiological And Biochemical Characteristics ◽  
Protein Peroxidation ◽  
Physiological And Biochemical ◽  
Different Levels ◽  
Different Growth Stages

In order to study effect of humic acid (HA) foliar application and limited irrigation, on physiological and biochemical characteristics of wheat an experiment was conducted in research field of Varamin, Iran during 2012 growing season. The experimental design was laid out in a randomized complete block with a split plots arrangement of treatments in three replications. Main plots included four different levels of irrigation (complete irrigation, irrigation withholding at stem elongation stage, irrigation withholding at flowering stage and irrigation withholding at seed setting stage) and three different concentration of HA foliar application (0, 150 and 300) was allocated to subplots. The results showed that irrigation withholding conditions in different growth stages significantly decreased seed yield and total chlorophyll content but by contrast increased electrolyte leakage, antioxidant enzymes activity and lipid and protein peroxidation. It appears that HA act in plants via a specific form of stress that is detected by anti-stress defense systems in plants. These HA applied to plants can protect against water stress in degraded soils.International Journal of Natural Sciences (2015), 5(1) 1-7

scholarly journals Effect of exogenous salicylic acid under irrigation withholding at different growth stages in wheat (Triticum aestivum L.)

2016 ◽  
Vol 4 (2) ◽  
pp. 28-33 ◽  
Author(s):  
MA Dabzad ◽  
HRT Moghadam ◽  
H Zahedi
Keyword(s):  
Salicylic Acid ◽  
Foliar Application ◽  
Stem Elongation ◽  
Triticum Aestivum L ◽  
Water Deficit Stress ◽  
Growth Stages ◽  
Wide Range ◽  
Protein Peroxidation ◽  
Positive Effect ◽  
Different Growth Stages

Salicylic acid (SA), an endogenous plant growth regulator has been found to generate a wide range of metabolic and physiological responses in plants affecting their growth and development. In order to study effect of salicylic acid foliar application and limited irrigation on quantitative and qualitative characteristics of wheat, this experiment was conducted at Varamin, Iran during 2014 growing season. The experimental design was laid out in a randomized complete block with a split plots arrangement of treatments in three replications. Main plots included four different levels of irrigation (complete irrigation, irrigation withholding at stem elongation stage, irrigation withholding at flowering stage and irrigation withholding at seed filling period stage) and different concentration of foliar application of salicylic acid (0, 150 and 300 ?M) were allocated to subplots. The results showed that irrigation withholding conditions in different growth stages significantly decreased seed yield, RWC and total chlorophyll but by contrast increased membrane stability, proline content, SOD and CAT enzymes activity and also lipid and protein peroxidation. Salicylic acid foliar application had positive effect on all attributes in this experiment. In general, the results of the present study indicate that usage of salicylic acid reduces the harmful effects of water deficit stress and increases resistance to drought stress in wheat plant.International Journal of Natural Sciences (2014), 4(2) 28-33

scholarly journals Effect of drought stress on the formation of yield elements in spring barley and the potential of stress expression reduction by foliar application of fertilizers and growth stimulator

2011 ◽  
Vol 50 (No. 10) ◽  
pp. 439-446 ◽  
Author(s):  
I. Svobodová ◽  
P. Míša
Keyword(s):  
Water Stress ◽  
Water Deficit ◽  
Foliar Application ◽  
Stem Elongation ◽  
Spring Barley ◽  
Growth Stages ◽  
Grain Number Per Spike ◽  
Yield Structure ◽  
1000 Grain Weight ◽  
Different Growth Stages

Spring barley plants were exposed to water stress at different growth stages – from the period after emergence to the beginning of stem elongation, from emergence to the end of anthesis and from the beginning of stem elongation to the end of anthesis in pot experiments. In variants exposed to water deficit from emergence to the end of anthesis and from the beginning of stem elongation to the end of anthesis, effects of foliar fertilizers and Atonik preparation (applied before the growth stage DC 30 or at DC 33) to lower the stress impacts were tested. During the growing season, formation and reduction of tillers, florets per spike and the yield structure at full ripeness were investigated. The water deficit at stem elongation caused a withering out of the established tillers, drought during the formation of the florets reduced their number as well as their development into grains. In the variant where water stress was present to the beginning of stem elongation, the plants were able to compensate for stress implications by productive tillers that developed later (at stem elongation). The previous water deficit did not decrease 1000-grain weight, however protein content in grain increased due to low grain yield per pot. If foliar fertilizers and Atonik were applied before DC 30, a reduction of fertile florets decreased, which led to slight increase in a grain number per spike.

Effects of irrigation and nitrogen on the yield components of fennel (Foeniculum vulgare Mill.)

1994 ◽  
Vol 34 (6) ◽  
pp. 845 ◽  
Author(s):  
M Buntain ◽  
B Chung
Keyword(s):  
Yield Components ◽  
Stem Elongation ◽  
Growth Stages ◽  
Full Irrigation ◽  
Flowering Stage ◽  
Foeniculum Vulgare ◽  
Late Flowering ◽  
Whole Plant ◽  
Dry Conditions ◽  
Different Growth Stages

A field experiment was conducted to study the effects of irrigation and nitrogen applied at different growth stages on the oil and anethole yields of fennel (Foeniculum vulgare Mill.), and its yield components. Irrigation increased the yield of whole plant dry matter, with the stem elongation stage being the most sensitive. Full irrigation and irrigation applied during the flowering and late flowering growth stages increased umbel and oil yields. Irrigation during the late flowering stage made the greatest contribution to oil yield, accounting for >80% of the yield due to full irrigation. This was attributed to the concurrent timing of irrigation during the late flowering stage with dry conditions and the development of the main oil-bearing structures, the secondary and tertiary umbels. Irrigation had no significant effect on the anethole concentration of the oil. The best economic return was achieved by irrigating during the late flowering stage. There was no significant effect of nitrogen on any of the yield components measured in this study.

scholarly journals Effects of Humic Acid-Irrigation Coupling Techniques on Temperature, Radiation and Rice Growth in Songnen Plain China

2021 ◽  
Author(s):  
Ennan Zheng ◽  
Yinhao Zhu ◽  
Jianyu Hu ◽  
Tianyu Xu ◽  
Zhongxue Zhang
Keyword(s):  
Humic Acid ◽  
Agricultural Soils ◽  
Application Rate ◽  
Growth Stages ◽  
Songnen Plain ◽  
Irrigation Methods ◽  
Fluorescence Characteristics ◽  
Coupling Techniques ◽  
Temperature Radiation ◽  
Different Growth Stages

Abstract In the past decades, the application of organ fertilizer in agricultural soils has attracted wide attention. However, few studies have carefully explored the effects of humic acid on soil and canopy temperature, radiation, the physiological process of plant leaves, especially coupling with the different irrigation methods. To provide a better growing environment for crops and explore the best regulation mode of humic acid and irrigation coupling techniques in the farmland soil environment in the Songnen Plain Heilongjiang Province, through field experiment, we selected rice as the test crop and applied humic acid in the soil with different irrigation methods. The temperature conditions, radiation, agronomic and fluorescence characteristics were monitored by different stages. The effects of different humic acid and irrigation coupling techniques on the temperature and radiation changes during different growth stages were discussed, and the subtle differences of agronomic and fluorescence characteristics in different growth stages of rice plants were compared. The results showed that the humic acid application with different irrigation methods was not beneficial to the maintenance of soil temperature, the differences among the different treatments, were no found significant at 5% probability statistically. However, the differences of radiation interception was obvious, and the best value was CT5 treatment, there were also similarities to plant height. The fluorescence indexes and leaf chlorophyll relative content (SPAD) had the differences with the change of humic acid application rate and irrigation methods. Over all, under the humic acid application rate of 1500 kg·ha-1 with the control irrigation method, could bring the best humic acid and irrigation effects.

EFFECT OF FOLIAR APPLICATION OF UREA ON DIFFERENT GROWTH STAGES OF WHEAT

2017 ◽  
Vol 3 (1) ◽  
pp. 01-11
Author(s):  
Siraj Ahmed Veesar ◽  
◽  
Ghulam Mustafa Laghari ◽  
Muhammad Ali Ansari ◽  
F.C. Oad ◽  
...  
Keyword(s):  
Foliar Application ◽  
Growth Stages ◽  
Different Growth Stages

scholarly journals Defoliation percentage in two soybean cultivars at different growth stages

2015 ◽  
Vol 19 (6) ◽  
pp. 567-573 ◽  
Author(s):  
Cláudio A. da S. Glier ◽  
José B. Duarte Júnior ◽  
Gabriel M. Fachin ◽  
Antonio C. T. da Costa ◽  
Vandeir F. Guimarães ◽  
...  
Keyword(s):  
Grain Yield ◽  
Block Design ◽  
Growth Stages ◽  
Production Potential ◽  
Soybean Cultivars ◽  
Randomized Block Design ◽  
Different Levels ◽  
Different Growth Stages ◽  
Phenological Phases

ABSTRACT The objective of this study was to evaluate the agronomic variables due to the effects of different levels of defoliation in the phenological phases of two soybean cultivars. The experiment was conducted during the 2011/2012 season, in a randomized block design with three replicates, in a 2 x 4 x 5 factorial scheme. Two cultivars were exposed to defoliations of 0, 25, 50, 75 and 100% at the stages of V4, V9, R3 and R5. The cultivar 'NK 7059RR' showed less sensitivity to defoliation than the cultivar 'IN 4990RG'. 25% defoliation levels reduced the yield of the cultivar 'IN 4990RG', while levels of 75 and 100% reduce the number of grains per pod in both cultivars. The defoliation performed in the V4 stage lead to lower grain yield than defoliation in V9. The most sensitive stages to defoliation are R3 and R5, where there is a greater reduction in the production potential of soybeans.

Proximal fluorescence sensing for in-season diagnosis of rice nitrogen status

2017 ◽  
Vol 8 (2) ◽  
pp. 343-348 ◽  
Author(s):  
S. Huang ◽  
Y. Miao ◽  
F. Yuan ◽  
Q. Cao ◽  
H. Ye ◽  
...  
Keyword(s):  
Stem Elongation ◽  
N Uptake ◽  
Growth Stages ◽  
Fluorescence Sensing ◽  
N Nutrition ◽  
N Concentration ◽  
Field Samples ◽  
Highly Correlated ◽  
Different Growth Stages ◽  
N Status

The objective of this study was to evaluate the potential of using Multiplex 3, a hand-held canopy fluorescence sensor, to determine rice nitrogen (N) status at different growth stages. In 2013, a paddy rice field experiment with five N fertilizer treatments and two varieties was conducted in Northeast China. Field samples and fluorescence data were collected simultaneously at the panicle initiation (PI), stem elongation (SE), and heading (HE) stages. Four N status indicators, leaf N concentration (LNC), plant N concentration (PNC), plant N uptake (PNU) and N nutrition index (NNI), were determined. The preliminary results indicated that different N application rates significantly affected most of the fluorescence variables, especially the simple fluorescence ratios (SFR_G, SFR_R), flavonoid (FLAV), and N balance indices (NBI_G, NBI_R). These variables were highly correlated with N status indicators. More studies are needed to further evaluate the accuracy of rice N status diagnosis using fluorescence sensing at different growth stages.

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