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- W2128830261 abstract "Five single-year field experiments conducted on phosphorus (P) deficient soils were used to calibrate plant P test criteria for rain-fed, spring wheat. At each site, P concentrations in whole shoots and young and mature leaf blades reached asymptotic values in the adequate-luxury P zone, within 6 weeks of sowing. The asymptotic P concentration varied between sites and declined as plants aged. The applied P level required to reach the asymptote increased with advancing plant age. Two consistent trends in relationships between relative shoot yield and P concentrations in whole shoots and leaf blades were observed. Firstly, as plants aged, the slope of the relationship in the zone of deficiency progressively increased and at later stages of growth became nearly vertical so that severely deficient plants had P concentrations only slightly lower than plants of adequate P status. Secondly, there was only a narrow range of P concentrations in the zone of adequate to luxury P status for whole shoots and young leaf blades. Plant P test criteria derived from field- and glasshouse-grown wheat coincided when related to stage of ontogeny as defined by the level of leaf insertion on the main culm. Using this as a basis of stage of plant growth, plant P criteria in shoots and young leaf blades were constant up until early tillering, declined rapidly until late tillering, and thereafter decreased more slowly. Critical concentration ranges for total P are proposed for YEB and for whole shoots. Critical values for grain P were estimated to lie between 0·19% and 0·23% P for 90% maximum grain yield and between 0·21% and 0·24% for near maximum grain yield. Soluble P and labile P fractions were highly correlated and produced similar relationships with relative shoot yield. The diagnostic relationships for both fractions had steep slopes in the zone of deficiency and criteria for standard leaf blades derived for either fraction sometimes declined as plants aged. The labile P: total P ratios for YEB and YEB+1 were also of diagnostic value; where this ratio was <30% during tillering, P deficiency was assured." @default.
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- W2128830261 date "1997-01-01" @default.
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- W2128830261 title "Phosphorus nutrition of spring wheat (Triticum aestivum L.). 4. Part 3, Aust. J. Agric. Res., 1997, 48, 883-97.. Calibration of plant phosphorus test criteria from rain-fed field experiments" @default.
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- W2128830261 doi "https://doi.org/10.1071/a96162" @default.
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