Wheat genotypes differ in growth and phosphorus uptake when supplied with different sources and rates of phosphorus banded or mixed in soil in pots

2002 ◽  
Vol 42 (8) ◽  
pp. 1103 ◽  
Author(s):  
G. R. Valizadeh ◽  
Z. Rengel ◽  
A. W. Rate
Keyword(s):  
Root Exudation ◽  
Phosphorus Uptake ◽  
Iron Phosphate ◽  
Aluminium Phosphate ◽  
Wheat Growth ◽  
Wheat Genotypes ◽  
Phosphorus Fertiliser ◽  
Phosphate Treatment ◽  
Fertiliser Application ◽  
Phosphorus Application

The growth response of wheat genotypes supplied with phosphorus fertiliser at different rates (banded or mixed throughout the soil) and sparingly soluble phosphorus sources (aluminium phosphate and iron phosphate) is not known. Eleven wheat genotypes and 1 rye genotype were tested at 3 rates of phosphorus fertiliser application (5, 10 and 20 mg P/kg soil) in a pot study. Another experiment compared 4 wheat genotypes at 2 rates of phosphorus application (deficient and sufficient) and 2 application methods (banding and mixing throughout the soil). The selected wheat genotypes were also used to investigate growth and root exudation response to iron phosphate and aluminium phosphate supply. Banding of phosphorus fertiliser increased the uptake of phosphorus and wheat growth compared with mixing phosphorus throughout the soil. Wheat genotypes did not differ significantly in growth and phosphorus uptake at the low rate of application. With increasing rates of phosphorus supply, the 2 phosphorus-fertiliser-responsive wheat genotypes (Wawht 2074 and Aroona) had significantly increased phosphorus uptake and root and shoot weights. When supplied with aluminium phosphate and iron phosphate, the 2 phosphorus-fertiliser-responsive genotypes had larger roots and higher concentration of phosphorus in the shoots and roots, while the phosphorus utilisation-efficient wheat genotypes (Westonia and Gutha) had higher shoot weights than phosphorus fertiliser-responsive ones. All wheat genotypes produced quantitatively and qualitatively similar root exudates in the iron phosphate, aluminium phosphate and zero-phosphorus treatments. The aluminium phosphate treatment caused genotypes to increase root exudation of oxalic anions, uptake of phosphorus and growth, compared with the iron phosphate treatment. It was concluded that the choice of genotypes for achieving increased wheat growth would depend on the phosphorus source in soil and the rate of application of phosphorus fertiliser.

Role of phosphorus fertiliser banding and the ratio of nitrate to ammonium on the uptake of phosphorus and wheat growth: a glasshouse study

2002 ◽  
Vol 42 (8) ◽  
pp. 1095 ◽  
Author(s):  
G. R. Valizadeh ◽  
Z. Rengel ◽  
A. W. Rate
Keyword(s):  
Root Growth ◽  
Soil Type ◽  
Growth Response ◽  
Phosphorus Content ◽  
Phosphorus Uptake ◽  
Nitrogen And Phosphorus ◽  
Wheat Growth ◽  
Nitrogen Fertiliser ◽  
Phosphorus Fertiliser

While it is known that nitrogen fertilisers improve phosphorus uptake depending on soil type and pH, the role in phosphorus uptake of the ratio of nitrate to ammonium in nitrogen fertiliser banded with phosphorus fertiliser is unclear. The present glasshouse study investigated the wheat growth response to different rates of application and banding depths (5 and 15 cm) of nitrogen and phosphorus, and mixing of phosphorus fertiliser with soil. The effect of 2 forms of nitrogen (ammonium and nitrate) banded with phosphorus fertiliser was also studied.Both banding depths increased phosphorus uptake and wheat growth more than mixing fertiliser throughout the soil. Banding at the 5 cm depth increased phosphorus uptake efficiency and wheat growth more than banding at the 15 cm depth. The highest shoot and root growth and phosphorus content were found when the nitrate : ammonium ratio was 50 : 50 and 75 : 25, with a slight decline at 100 : 0. The treatments with a large proportion of ammonium suppressed the growth of wheat and, consequently, reduced total phosphorus content. It was concluded that banding nitrate and ammonium at ratios 50 : 50, 75 : 25 and 100 : 0 with phosphorus fertiliser at 5 cm depth was optimal for increasing phosphorus uptake and wheat growth.

THE INFLUENCE OF VARIETY, SOIL TEMPERATURE, AND PHOSPHORUS FERTILIZER ON YIELD AND PHOSPHORUS UPTAKE BY ALFALFA

1963 ◽  
Vol 43 (3) ◽  
pp. 355-360 ◽  
Author(s):  
M. Levesque ◽  
J. W. Ketcheson
Keyword(s):  
Soil Temperature ◽  
Dry Matter ◽  
Phosphorus Content ◽  
Soil Phosphorus ◽  
Phosphorus Uptake ◽  
Growth Period ◽  
Yield Potential ◽  
Phosphorus Fertilization ◽  
Maximum Value ◽  
Phosphorus Application

Du Puits and Ladak varieties of alfalfa were grown for 10 weeks in the greenhouse on soil-sand media controlled at temperatures of 10°, 18°, and 26 °C. P32-tagged superphosphate was applied at rates of 10 and 80 p.p.m. phosphorus, respectively. Dry matter yields and phosphorus content of the tissue was determined at the end of the growth period. Increasing soil temperature from 10° to 26 °C. caused corresponding increases in total phosphorus uptake as a result of an increase in dry matter yields as well as an increase in the percentage of phosphorus in the plant tissue. Ladak exhibited the higher yield potential although Du Puits was less affected by low soil temperature conditions and appeared capable of making better use of soil phosphorus. With the higher phosphorus application, the root-top ratio for Du Puits was greater than that for Ladak, and the maximum value for this ratio occurred at 18 °C. for each variety. P32 activity measured in the tissue indicated that soil temperature was critical in terms of phosphorus fertilization in the 4- and 6-week stages of growth.

scholarly journals Assessment of foliar-applied phosphorus fertiliser formulations to enhance phosphorus nutrition and grain production in wheat

2020 ◽  
Vol 71 (9) ◽  
pp. 795 ◽  
Author(s):  
Therese M. McBeath ◽  
Evelina Facelli ◽  
Courtney A. E. Peirce ◽  
Viran Kathri Arachchige ◽  
Michael J. McLaughlin
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Triticum Aestivum L ◽  
P Uptake ◽  
Isotopic Dilution ◽  
Yield Response ◽  
Phosphorus Fertiliser ◽  
P Application ◽  
P Recovery ◽  
Fertiliser Application

The ability to utilise foliar-applied phosphorus (P) as a strategy to increase the P status and yield of grain crops grown in dryland regions with variable climates is attractive. Several P formulations with varying pH, accompanying cations and adjuvants were tested for their effectiveness as foliar fertilisers for wheat (Triticum aestivum L.) plants, first under controlled and then under field conditions. Experiments under controlled conditions suggested that several formulations with specific chemistries offered promise with respect to wheat fertiliser-P recovery and biomass responses. These formulations were then evaluated in two field experiments, and although wheat grown at the sites showed substantive responses to soil-applied P, there was no significant grain-yield response to foliar-applied P. Following the limited responses to foliar-applied fertiliser in the field, we used an isotopic dilution technique to test the hypothesis that the variation in responses of wheat to foliar addition of P could be explained by a mechanism of substitution, whereby root P uptake is downregulated when P is taken up through the leaves, but this was proven not to be the case. We conclude that foliar P application cannot be used as a tactical fertiliser application to boost grain yield of wheat in dryland regions.

Characterizing Wheat Response to Water Limitation Using Multispectral and Thermal Imaging

2017 ◽  
Vol 60 (5) ◽  
pp. 1457-1466 ◽  
Author(s):  
Geng Bai ◽  
Sarah Blecha ◽  
Yufeng Ge ◽  
Harkamal Walia ◽  
Piyaporn Phansak
Keyword(s):  
Image Processing ◽  
Drought Tolerance ◽  
Infrared Imaging ◽  
Crop Improvement ◽  
Thermal Infrared ◽  
Plant Phenotyping ◽  
Crop Water Stress Index ◽  
Wheat Growth ◽  
Thermal Infrared Imaging ◽  
Wheat Genotypes

Abstract. Effective screening of plant genotypes for their tolerance to abiotic stress is a vital step for crop improvement. Various sensing technologies can be used for developing automated plant phenotyping systems as well as for better control of stress levels imposed on the plants. In this study, seven different wheat genotypes (G1 through G7) were grown under two different water regimes in a greenhouse. Soil moisture was monitored by soil water tension sensors distributed among the experimental plots. A sensor platform with two cameras (a multispectral camera and a thermal infrared camera) was developed to capture top-view images of the wheat plots (once a week) during the course of the experiment. Image processing algorithms were developed to extract wheat growth index (GI) and crop water stress index (CWSI). Ratios of GI and CWSI between the two water treatments were calculated as proxies to assess drought tolerance of the different genotypes. The results showed that GI was correlated with NDVI measured by a GreenSeeker sensor (R2 = 0.65). Among the seven wheat genotypes studied, G5, G6, and G7 exhibited consistently higher GI ratios and lower CWSI ratios, an indication of their superiority in drought tolerance. It was also found that non-uniform environmental conditions in the greenhouse had quite a large influence on wheat growth, which made the characterization and differentiation of phenotypes among various genotypes more challenging. It is concluded that the multispectral and thermal infrared imaging system has potential for phenotypic screening of wheat genotypes for drought tolerance in a semi-controlled environment. Keywords: CWSI, Drought, Image processing, Multispectral imaging, Phenotyping, Thermal infrared imaging.

scholarly journals Data on rhizosphere pH, phosphorus uptake and wheat growth responses upon TiO2 nanoparticles application

Data in Brief ◽  
2018 ◽  
Vol 17 ◽  
pp. 890-896 ◽  
Author(s):  
Rafia Rafique ◽  
Zahra Zahra ◽  
Nasar Virk ◽  
Muhammad Shahid ◽  
Eric Pinelli ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Phosphorus Uptake ◽  
Rhizosphere Ph ◽  
Growth Responses ◽  
Wheat Growth
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