scholarly journals Nitrogen Fertilizer and Straw Applications Affect Uptake of 13C,15N-Glycine by Soil Microorganisms in Wheat Growth Stages

PLoS ONE ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. e0169016 ◽  
Author(s):  
Lijie Yang ◽  
Lili Zhang ◽  
Chunxiao Yu ◽  
Dongpo Li ◽  
Ping Gong ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Soil Microorganisms ◽  
Growth Stages ◽  
Wheat Growth

scholarly journals Resistance to Puccinia triticina at different stages of wheat

2009 ◽  
pp. 183-190
Author(s):  
Marina Putnik-Delic
Keyword(s):  
Leaf Senescence ◽  
Latency Period ◽  
Infection Intensity ◽  
Puccinia Triticina ◽  
Growth Stages ◽  
Infection Frequency ◽  
Strongly Correlated ◽  
Wheat Growth ◽  
Reaction Type ◽  
Different Growth Stages

Ten wheat genotypes were tested for resistance characteristics to Puccinia triticina. Infection intensity in the field was evaluated at different growth stages, and time of spike appearance and leaf senescence were recorded. At seedling stage, under the controlled conditions of greenhouse, latency period, infection frequency and reaction type were determined. Resistance characteristics at different wheat growth stages were strongly correlated. Correlation coefficient between LP x RT x IF and AUDPC values, was 0.828. The highest coefficients of correlation between particular resistance characteristics and maximal intensity in the field were determined with the last evaluation in the field (0.665, 0.476 and 0.834). Time of spike appearance was very variable for different genotypes, whereas leaf senescence was recorded concomitantly for near all genotypes. The exception was Rusalka, as the most resistant in the field. All genotypes included in this three-year long experiment expressed stability with respect to infection intensity at different growth stages. Genotype Timson showed the highest level of resistance according to all tested characteristics, while genotype Pkb krupna showed the lowest.

Effect of Dicamba on RNA and Protein

Weed Science ◽  
1971 ◽  
Vol 19 (3) ◽  
pp. 301-305 ◽  
Author(s):  
W. E. Arnold ◽  
John D. Nalewaja
Keyword(s):  
Callus Tissue ◽  
Growth Stages ◽  
Wheat Growth ◽  
Wild Buckwheat ◽  
Plant Parts ◽  
Temperature And Precipitation ◽  
Boot Stage ◽  
Polygonum Convolvulus ◽  
Anisic Acid

The effect of 3,6-dichloro-o-anisic acid (dicamba) was studied on wild buckwheat (Polygonum convolvulusL.) and wheat (Triticum aestivumL.) at two growth stages. Wild buckwheat, treated when 5 to 8 cm tall, was very susceptible to dicamba which caused rapid dehydration of the leaves and growth of callus tissue at stem internodes. Wild buckwheat, treated when flowering, increased in growth 2 days after treatment and then decreased after 4 days. Wheat growth tended to increase in all plant parts after treatment with dicamba at both the 2 to 3-leaf and the boot stages. Dicamba increased the RNA and protein content in wild buckwheat at both growth stages and in wheat at the boot stage. Dicamba affected the transition temperature and precipitation of reconstituted nucleohistone but not the uncombined nucleic acid or histonein vitro, indicating that a DNA-histone-dicamba complex had occurred. The binding of dicamba to protein varied with different proteins and reduced the UV absorbance of the bound proteins.

scholarly journals Changes in soil biochemical indicators at different wheat growth stages under conservation-based sustainable intensification of rice-wheat system

2018 ◽  
Vol 17 (8) ◽  
pp. 1871-1880 ◽  
Author(s):  
Tanushree Bera ◽  
Sandeep Sharma ◽  
H.S. Thind ◽  
Yadvinder-Singh ◽  
H.S. Sidhu ◽  
...  
Keyword(s):  
Sustainable Intensification ◽  
Growth Stages ◽  
Wheat Growth ◽  
Biochemical Indicators

scholarly journals The Modification of Difference Vegetation Index (DVI) in middle and late growing period of winter wheat and its application in soil moisture inversion

2019 ◽  
Vol 131 ◽  
pp. 01098
Author(s):  
Zhang Hong-wei ◽  
Huai-liang Chen ◽  
Fei-na Zha
Keyword(s):  
Soil Moisture ◽  
Winter Wheat ◽  
Vegetation Index ◽  
Vegetation Coverage ◽  
Growth Stages ◽  
Wheat Growth ◽  
Inversion Result ◽  
Growing Period ◽  
The Difference ◽  
Different Growth Stages

In the middle and late growing period of winter wheat, soil moisture is easily affected by saturation when using MODIS data to retrieve soil moisture. In this paper, in order to reduce the effect of the saturation caused by increasing vegetation coverage in middle and late stage of winter wheat, the Difference Vegetation Index (DVI) model was modified with different coefficients in different growth stages of winter wheat based on MODIS spectral data and LAI characteristics of variation. LAI was divided into three stages, LAI ≤ 1 < LAI ≤, 3 < LAI, and the adjusting coefficient of α=1, α=3, α=5, were taken to modifying the Difference Vegetation Index(DVI). The results show that the Modified Difference Vegetation Index (MDVIα) can effectively reduce the interference of saturation, and the inversion result of soil moisture in the middle and late period of winter wheat growth is obviously superior to the uncorrected inversion model of DVI.

Response of Inga rice to application of nitrogen fertilizer at varying growth stages

1984 ◽  
Vol 24 (125) ◽  
pp. 250 ◽  
Author(s):  
PE Bacon ◽  
DP Heenan
Keyword(s):  
Grain Yield ◽  
Nitrogen Fertilizer ◽  
Vegetative Growth ◽  
Yield Response ◽  
Growth Stages ◽  
Nitrogen Application ◽  
Nitrogen Use

The growth, nitrogen use and yield of rice cv. lnga were examined in three experiments in 1978, 1979 and 1980. In each experiment, one rate of nitrogen was applied at six different times between permanent flood and three weeks after panicle initiation. Application of 50 kg N/ha in 1978 and 70 kg N/ha in 1980 at permanent flood increased yield. A higher rate (100 kg N/ha) at permanent flood in 1979 greatly increased vegetative growth but had little effect on grain yield. The grain yield response to 100 kg N/ha in 1979 significantly increased when application was delayed until panicle initiation. Nitrogen topdressing up to 14 d after panicle initiation resulted in an increased percentage of filled florets per panicle and heavier grains compared with application 14-21 d before panicle initiation. Delaying nitrogen application till 2 1 d after panicle initiation resulted in lower numbers of florets per panicle and consequently reduced yield.

scholarly journals 1029 PREDICTING IN-SEASON NITROGEN REQUIREMENTS FOR IRRIGATED POTATOES USING NITRATE SAPTESTS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 575g-576
Author(s):  
Carl J. Rosen ◽  
Mohamed Errebhi
Keyword(s):  
Nitrogen Fertilizer ◽  
Management Practice ◽  
Rapid Test ◽  
Sandy Soils ◽  
Growing Season ◽  
Growth Stages ◽  
Nitrate Losses ◽  
Important Concern ◽  
Final Yield ◽  
Nitrogen Rates

Applying appropriate rates of nitrogen fertilizer during the growing season for potatoes on irrigated sandy soils is an important concern from both a production and environmental standpoint. Although potatoes on sandy soils are responsive to nitrogen fertilizer, high rates of nitrogen applied early in the growing season have been associated with nitrate leaching due to unpredictable rainfall. Use of lower nitrogen rates applied more frequently through the season is one strategy to minimize nitrate losses and improve nitrogen use efficiency. Portable nitrate electrodes were used to measure nitrate concentrations in petiole sap. Diagnostic criteria based on final yield and nitrate sap concentrations at various growth stages were developed over a three year period. This rapid test can now be used to make an immediate assessment of nitrogen status of the plant and a prediction for whether supplemental nitrogen will be needed. On-farm trials are currently being carried out to demonstrate the use of the saptest as a best management practice.

scholarly journals Morfogeneza pędów krzewiącej się pszenicy oraz dynamika ich elongacyjnego wzrostu [Morphogenesis of shoots of tillering plants of winter wheat and the dynamics of their elongation growth]

2015 ◽  
Vol 28 (1) ◽  
pp. 5-28
Author(s):  
Witold Drezner
Keyword(s):  
Winter Wheat ◽  
Elongation Growth ◽  
Growth Stages ◽  
Main Shoot ◽  
Wheat Growth

The morphogenesis of vegetative shoots of tillering plants of the winter wheat, the mode of identification and the description of the sequence of formation of individual shoots are presented. The average elongation growth of plants (e) in the successive growth stages are described as the sum of the increase of the main shoot (a) and of the side (secondary) shoots (Σ b) divided by the number of measured tillers (1) and by the time unit (t) according to the equation. By this method the correlation between the dynamics of winter wheat growth and the grade of tillering are described for three varieties.

scholarly journals Effect of super-optimal levels of fertilizers on soil enzymatic activities during growth stages of wheat crop on an Inceptisol

2016 ◽  
Vol 8 (3) ◽  
pp. 1398-1403 ◽  
Author(s):  
Rajiv Rakshit ◽  
A.K. Patra ◽  
T.J. Purakayastha ◽  
R.D. Singh ◽  
Shiva Dhar ◽  
...  
Keyword(s):  
Enzyme Activities ◽  
Optimal Dose ◽  
Fertilizer Application ◽  
Matrix Analysis ◽  
Wheat Crop ◽  
Mineral Fertilizers ◽  
Growth Stages ◽  
Soil Enzyme Activities ◽  
Positive Interaction ◽  
Wheat Growth

A field experiment was conducted during 2010-2011 and 2011-2012 to investigate the effect of optimal (100% NPK) to super-optimal doses (200% NPK) of mineral fertilizers on soil enzymes such as dehydrogenase (DHA), acid phosphatase (Ac-PA), alkaline phosphatase (Alk-PA), fluorescien diacetate hydrolysis (FDA), urease and nitrate reductase (NRA) at three physiological stages (CRI, anthesis and maturity) of wheat crop on an Inceptisol. Dehydrogenase activity was reduced by 28-37% when fertilizer application was at super-optimal dose (200% NPK), whereas, urease and NRA responded positively in the range of 43-44% and 213-231% respectively. Alk-PAwas 7.3-7.9% higher in treatments receiving 125% NPK as compared to control (100% NPK); whereas, Ac-PA declines in the plots receiving 175 and 200% of recommended dose of fertilizer (RDF) as compared to 150% NPK levels. Addition of 175% RDF increased the FDA to the tune of 46-53% as compared to 100% NPK. A significant (P≤0.05) positive interaction between fertilizer treatments and physiological stages of wheat growth was observed on soil enzyme activities (except urease and NRA) being highest at the anthesis stage of wheat. Correlation matrix analysis showed that DHA was correlated with the studied enzyme activities except Ac-PA and FDA; whereas, strong correlation was observed between urease and NRA (r=0.981, P=0.01). This study provides theoretical and practical base for avoiding super optimal application of fertilisers which hinders the enzyme activities and vis-a-vis sustainable nutrient enrichment under rhizosphere.

Discrepancies between observed and predicted growth stages in wheat

1997 ◽  
Vol 129 (4) ◽  
pp. 379-384 ◽  
Author(s):  
E. J. M. KIRBY ◽  
R. M. WEIGHTMAN
Keyword(s):  
Stem Elongation ◽  
Daily Maximum ◽  
Growth Stages ◽  
Main Shoot ◽  
Wheat Growth ◽  
Growing Seasons ◽  
Leaf Emergence ◽  
Prediction Scheme ◽  
Number Of Leaves ◽  
Input Variables

A model to predict wheat growth stage is briefly described. It is based on prediction of the number of emerged leaves and the final number of leaves on the main shoot, and the co-ordination between leaf emergence and apex development, including stem elongation. The input variables are daily maximum and minimum temperatures, date of sowing and site latitude, from which thermal time, vernalization and daylength are calculated.Selected growth stages were predicted for six sites in each of three growing seasons. The differences between observations made by independent observers and predictions were mostly 7 days or less but in three site–season combinations the average difference was >10 days. Observer errors were implicated and examined, but it is concluded that the prediction scheme must also have been partly responsible for the discrepancies.

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