Principal components of sea surface temperatures as predictors of seasonal rainfall in rainfed wheat growing areas of<scp>P</scp>akistan

Ogtrop, Floris van; Ahmad, Mukhtar; Moeller, Carina

doi:10.1002/met.1429

Cited by 29 publications

(14 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Talagang (32°55’N, 72°25’E, 458 m a.s.l.) has an arid climate and is located in the low rainfall zone [ 21 ]. The annual ET 0 at Talagang is about 1592 mm.…”

Section: Methodsmentioning

confidence: 99%

Response of Spring Wheat (Triticum aestivum L.) Quality Traits and Yield to Sowing Date

Ahmed

Fayyaz-ul-Hassan

2015

PLoS ONE

View full text Add to dashboard Cite

The unpredictability and large fluctuation of the climatic conditions in rainfed regions do affect spring wheat yield and grain quality. These variations offer the opportunity for the production of better quality wheat. The effect of variable years, locations and sowing managements on wheat grain yield and quality was studied through field experiments using three genotypes, three locations for two years under rainfed conditions. The two studied years as contrasting years at three locations and sowing dates depicted variability in temperature and water stress during grain filling which resulted considerable change in grain yield and quality. Delayed sowing, years (2009–10) and location (Talagang) with high temperature and water stress resulted increased proline, and grain quality traits i.e. grain protein (GP) and grain ash (GA) than optimum conditions (during 2008–09, at Islamabad and early sowing). However, opposite trend was observed for dry gluten (DG), sodium dodecyl sulphate (SDS), SPAD content and grain yield irrespective of genotypes. The influence of variable climatic conditions was dominant in determining the quality traits and inverse relationship was observed among some quality traits and grain yield. It may be concluded that by selecting suitable locations and different sowing managements for subjecting the crop to desirable environmental conditions (temperature and water) quality traits of wheat crop could be modified.

show abstract

“…Talagang (32°55’N, 72°25’E, 458 m a.s.l.) has an arid climate and is located in the low rainfall zone [ 21 ]. The annual ET 0 at Talagang is about 1592 mm.…”

Section: Methodsmentioning

confidence: 99%

Response of Spring Wheat (Triticum aestivum L.) Quality Traits and Yield to Sowing Date

Ahmed

Fayyaz-ul-Hassan

2015

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Field experiments were carried out during the wheat growing seasons of 2013-2014 and 2014-2015 at three variable climatic locations of Pothwar, i.e., low rainfall area, Talagang (32 • [40] (Figures 1-3). Urea ((NH 2 ) 2 CO) (46% N) fertilizer was applied as full at the time of sowing and split doses (sowing, tillering, and anthesis).…”

Section: Study Sites Treatments Plant Material and Experimental Dementioning

confidence: 99%

Impact of Nitrogen Addition on Physiological, Crop Total Nitrogen, Efficiencies and Agronomic Traits of the Wheat Crop under Rainfed Conditions

et al. 2019

View full text Add to dashboard Cite

Optimizing nitrogen (N) application timings and rate can improve nutrient uptake and nutrient efficiencies in wheat, particularly under rainfed conditions. Climatic stress in the form of high temperature and drought resulted in the decreased crop physiological traits, hastened maturity and, ultimately, caused lower grain yield. The impact of N application rates as full and split dose at three diverse locations of rainfed Pothwar, Pakistan was studied through field experiments for two years (2013–14 and 2014–15). Treatments include T1 = control (no fertilizer applied), full dose of N applied at the time of crop sowing, i.e., T2 = 50 kg N ha−1, T3 = 100 kg N ha−1 and T4 = 150 kg N ha−1, and split application of N at different timings at different stages of the crop, called split application of N, i.e., T5: application of 50 kg N ha−1 (15 kg N ha−1 (sowing, BBCH (Biologische Bundesanstalt Bundessortenamt und Chemische Industrie) 0): 20 kg N ha−1 (tillering, BBCH20): 15 kg N ha−1 (anthesis, BBCH 60), T6: application of 100 kg N ha−1 (30 kg N ha−1 (sowing, BBCH 0): 40 kg N ha−1 (tillering, BBCH 20): 30 kg N ha−1 (anthesis, BBCH 60) and T7: application of 150 kg N ha−1 (45 kg N ha−1 (sowing, BBCH 0): 60 kg N ha−1 (tillering, BBCH 20): 45 kg N ha−1 (anthesis, BBCH 60). The three study sites were Islamabad (high rainfall with optimum temperature), University Research Farm (URF)-Chakwal Road, Koont (medium rainfall with moderate temperature), and Talagang (low rainfall with high temperature). Results revealed that the highest stomatal conductance (0.80 mole H2O m−2 s−1), net photosynthetic rate (20.07 μmole CO2 m−2 s−1), transpiration rate (9.58 mmole H2O m−2 s−1), intercellular CO2 concentration (329.25 μmole CO2 mol−1 air), SPAD values (58.86%) and proline contents (35.42 μg g−1) were obtained from split application of N (T6 = split N100) compared to control and full dose N treatments. Among the sites, these physiological traits remained highest at Islamabad and lowest at Talagang, while between the years, the maximum values of the measured parameters were obtained during 2013–14. A similar trend was observed for crop total N, N efficiencies, and agronomic traits of the crop. The results suggested that the optimum N application rate at appropriate timings can help to harvest the real benefits of N. The split dose resulted in the maximum performance of the crop from the physiological parameters to the agronomic traits of the crop.

show abstract

“…IPCC (2014) reported 2000s as the warmest decade and 2014 as the warmest year. Agricultural productivity is under threat due to climate change all over the globe as predicted by current and future scenarios (van Ogtrop et al, 2014;Ahmad et al, 2017;Dettori et al, 2017). Increased temperature significantly influences crop productivity and can lead to dramatic yield loss.…”

Section: Introductionmentioning

confidence: 99%

Can Growing Degree Days and Photoperiod Predict Spring Wheat Phenology?

Aslam

Ahmed

Stöckle

et al. 2017

Front. Environ. Sci.

View full text Add to dashboard Cite

Wheat (Triticum aestivum) production in the rainfed area of Pothwar Pakistan is extremely vulnerable to high temperature. The expected increase in temperature due to global warming should result in shorter crop life cycles, and thus lower biomass and grain yield. Two major factors control wheat phenological development: temperature and photoperiod. To evaluate wheat development in response to these factors, we conducted experiments that created diverse temperature and daylength conditions by adjusting the crop sowing time. The study was conducted during 2013-14 and 2014-15 using five spring wheat genotypes, four sowing times, at three sites under rainfed management in Pothwar, Pakistan. Wheat crops experienced more cold days with early sowing, but later sowing dates resulted in higher temperatures, especially from anthesis to maturity. These treatments produced large differences in phenology, biomass production, and yield. To investigate whether growing degree days (GDD) and photoperiod algorithms could predict wheat phenology under these changing conditions, GDD was calculated based on the method proposed by Wang and Engel while photoperiod followed the approach introduced in the APSIM crop growth model. GDD was calculated separately and in combination with photoperiod from germination to anthesis. For the grain filling period, only GDD was calculated. The observed and predicted number of days to anthesis and maturity were in good agreement, showing that the combination of GDD and photoperiod algorithms provided good estimations of spring wheat phenology under variable temperature and daylength conditions.

show abstract

Principal components of sea surface temperatures as predictors of seasonal rainfall in rainfed wheat growing areas ofPakistan

Cited by 29 publications

References 75 publications

Response of Spring Wheat (Triticum aestivum L.) Quality Traits and Yield to Sowing Date

Response of Spring Wheat (Triticum aestivum L.) Quality Traits and Yield to Sowing Date

Impact of Nitrogen Addition on Physiological, Crop Total Nitrogen, Efficiencies and Agronomic Traits of the Wheat Crop under Rainfed Conditions

Can Growing Degree Days and Photoperiod Predict Spring Wheat Phenology?

Contact Info

Product

Resources

About