Yield and yield components of wheat subjected to water stress under rainfed conditions in Pakistan

2003 ◽  
Vol 51 (3) ◽  
pp. 315-323 ◽  
Author(s):  
R. H. Kazmi ◽  
M. Q. Khan ◽  
M. K. Abbasi
Keyword(s):  
Water Stress ◽  
Leaf Area ◽  
Yield Components ◽  
Flag Leaf ◽  
Growth Stages ◽  
Terminal Drought ◽  
Yield And Yield Components ◽  
Rainfed Conditions ◽  
Control Terminal ◽  
Stalk Length

The investigation was concerned with the effects of water stress on the yield and yield components of wheat grown under rainfed conditions in Rawalakot, Pakistan. A pot experiment was conducted with four wheat genotypes, Inqlab-91, Chakwal-97, Rawal-87 and Kohsar-95, tested against five irrigation levels with drought imposed at different growth stages including control, terminal drought, post-anthesis drought, three irrigations and pre-anthesis drought. The parameters studied were flag leaf area, ear stalk length, number of grains per spike and grain yield per pot. Flag leaf area and ear stalk length exhibited a significant reduction of 14 and 36%, respectively, when wheat was subjected to water stress. The proportional reduction in yield was 40% with three irrigations and 98% in the case of pre-anthesis drought depending upon the extent and degree of stress. Results showed that wheat could withstand and tolerate drought only up to anthesis, after which water stress resulted in the complete failure of the crop. It could be deduced that the critical stage for moisture in wheat started 60 days after germination, and became more severe at 90 days, i.e. at the anthesis stage. Among the genotypes, Inqlab-91 was found to be more tolerant of drought and could thus be a good option for further testing and recommendation for rainfed areas.

scholarly journals Growth And Yield Components Of Wheat Under Water Stress Of Different Growth Stages

1970 ◽  
Vol 36 (3) ◽  
pp. 455-468 ◽  
Author(s):  
M Akram
Keyword(s):  
Triticum Aestivum ◽  
Water Stress ◽  
Yield Components ◽  
Growth And Yield ◽  
Growth Stages ◽  
Wheat Cultivars ◽  
Yield And Yield Components ◽  
Relative Water ◽  
Different Growth Stages ◽  
Water Contents

A field experiment was conducted to determine the sensitivity of wheat to water stress and changes in water relations and yield of wheat (Triticum aestivum L.) under water stress conditions applied at different growth stages. The experiment comprised of two wheat cultivars and four water stress treatments, maintained by withholding water at tillering, anthesis, and at both stages. Water stress caused reduction in leaf relative water contents, water potential, osmotic potential, turgor potential, growth and yield components of both the wheat cultivars. The results indicated that high value of relative water contents were associated with increased yield and yield components. Consecutive stresses at both growth stages caused severe reduction in yield and yield components in both cultivars of wheat. Keywords: Water stress; water relations; growth; Triticum aestivum; yield components. DOI: http://dx.doi.org/10.3329/bjar.v36i3.9264 BJAR 2011; 36(3): 455-468

Effect of Biochar on Maize Yield and Yield Components in Rainfed Conditions

2018 ◽  
Author(s):  
Zafar Ullah ◽  
Muhammad Shahbaz Akmal ◽  
Muzaffar Ahmed ◽  
Mohammed Ali ◽  
Aurangzaib Zaib Khan ◽  
...  
Keyword(s):  
Yield Components ◽  
Maize Yield ◽  
Yield And Yield Components ◽  
Rainfed Conditions

scholarly journals Performance of Ratoon Rice Under Different Stubble Cuttings and Fertilizer Management

2005 ◽  
Vol 5 (1) ◽  
pp. 42-54
Author(s):  
Bayani Dejaño ◽  
◽  
Reynaldo Javier ◽  
Keyword(s):  
Leaf Area ◽  
Yield Components ◽  
Fertilizer Treatment ◽  
Fertilizer Management ◽  
Ratoon Crop ◽  
Straw Yield ◽  
Net Return ◽  
Agronomic Characteristics ◽  
Main Crop ◽  
Yield And Yield Components

Stubble cutting heights significantly affected the agronomic characteristics as well as the yield and yield components of ratoon rice. Similarly, fertilizer treatment moslty influenced the agronomic and yield and yield components of ratoon rice. Plants applied with basal or foliar or a combination of two were harvested late, grew taller, had wider leaf area, higher straw yield, more tillers, longer and heavier panicles, more yield and harvest indices. Cost and return main crop + ratoon crop using the different studble cutting heights and fertilizer treatments were economically profitable. Results showed that basal application of fertilizer at a rate of 60-30-30 kg N, P2O5 and K2O obtained the highest net return of P19,868.56.

scholarly journals Genetic variability, character association and diversity analyses for economic traits in rice (Oryza sativa L.)

2014 ◽  
Vol 10 (2) ◽  
pp. 83-94 ◽  
Author(s):  
N Pratap ◽  
PK Singh ◽  
R Shekhar ◽  
SK Soni ◽  
AK Mall
Keyword(s):  
Grain Yield ◽  
Yield Components ◽  
Oryza Sativa L ◽  
Flag Leaf ◽  
Selection Strategy ◽  
Economic Traits ◽  
Character Association ◽  
Yield And Yield Components ◽  
Biological Yield ◽  
High Yielding Varieties

One hundred high yielding rice genotypes were evaluated to determine character association, variability and diversity for grain yield, yield components and quality characters. High estimates of heritability, genetic advance, genotypic and phenotypic coefficients of variation were recorded for panicle hill-1, flag leaf area and grain yield hill-1. Majority of the traits showed significant and positive associations between yield and yield components like biological yield hill-1 followed by harvest-index as most important traits which need due consideration at the time of devising selection strategy. Thus, presence of several contrasting types of inter-relationships simultaneously would bring improvement in others due to correlated responses. Path analysis might have resulted into cancellation of contrasting associations by each other which ultimately lead to lowering of the net impact. This suggested that selection would be quite efficient in improving yield and yield components in context of germplasm evaluated. The crossing between superior genotypes of above diverse cluster pairs may provide desirable transgressive segregants for developing high yielding varieties of aromatic and non-aromatic rice. Thus, hybridization of Swarna of cluster XI with promising genotypes of cluster VI (Narendra 118, Vandana, Narendra 1, Akashi and Narendra 97) is recommended. DOI: http://dx.doi.org/10.3329/sja.v10i2.18326 SAARC J. Agri., 10(2): 83-94 (2012)

scholarly journals Relationship between Flag Leaf Characteristics and Main Yield Components in Oat (Avena sativa L.)

2019 ◽  
Vol 76 (1) ◽  
pp. 71
Author(s):  
Ionuṭ RACZ ◽  
Rozalia KADAR ◽  
Sorin VȂTCĂ ◽  
Ioana Virginia BERINDEAN ◽  
Adrian CECLAN ◽  
...  
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Avena Sativa ◽  
Yield Components ◽  
Flag Leaf ◽  
Chlorophyll Concentration ◽  
Area Index ◽  
Leaf Chlorophyll ◽  
Leaf Chlorophyll Concentration

The objective of this study was to investigate relationships between leaf area index, leaf chlorophyll concentration, yield components and grain yield in oat (Avena sativa L.). Ten oat varieties were analyzed in field conditions regarding those traits. Flag leaf chlorophyll concentration range between 451.51 and 747.79 units of μmol of chlorophyll per m2. Also, leaf area index range between 13.68 to 32.84 cm2. Significant correlation indices were highlighted between yield components and leaf area index, yield/yield components and chlorophyll concentration of flag leaf.

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