Phosphorus: A limiting nutrient in bean (Phaseolus vulgaris L.) production in Latin America and field screening for efficiency and response

Thung, M.

doi:10.1007/978-94-009-2053-8_71

Cited by 39 publications

(36 citation statements)

References 25 publications

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“…It does seem to be possible to find an effective approach for screening P-efficient genotypes. Similar results were obtained by Leon et al (1989) for maize, by Thung (1990) for Phaseolus beans, and by Römer and Schenk (1998) for barley. However, P uptake and P-utilization efficiency at shooting stage may offer the possibility of evaluating wheat genotypes for P efficiency, because a positive correlation for those parameters between plants at this development stage and maturity was found (Table 5).…”

Section: Discussionsupporting

confidence: 86%

Screening Chinese Wheat Germplasm for Phosphorus Efficiency in Calcareous Soils

Wang

et al. 2005

Journal of Plant Nutrition

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Twenty commonly used winter wheat genotypes collected throughout China were used in field screening for phosphorus (P)-efficient germplasm in a calcareous soil with and without fertilizer P application; the same genotypes were also evaluated for high and low P inputs in a greenhouse experiment. The overall criterion for P efficiency was the capacity to produce a relatively high yield with low P availability. Significant differences in grain yield production occurred between efficient and inefficient genotypes. Four parameters were calculated to determine which was the most useful for describing P efficiency: (1) percentage of relative yield with no applied P; (2) total P uptake; (3) P-harvest index (PHI: grain P/total P uptake); and (4) P-utilization efficiency (PUE: grain yield produced per unit of P taken up). A simple but satisfactory criterion in screening P-efficient wheat genotypes, 85% of relative grain yield at low P/high P, was recommended and proved to be more effective than the other three parameters. With this criterion, 12 out of 20 genotypes were classified as P-efficient (≤15% yield reduction with no P applied) from both field and pot experiments. Phosphorus efficiency may have resulted from either P uptake or P-utilization efficiency. Three parameters, namely relative yield without applied P, PHI and PUE, were found to be useful, together with P uptake, in determining overall P efficiency. Successful selection for P efficiency was found to be possible at the shooting stage (but not at tillering) by comparing P uptake and P-utilization efficiency of plants at this growth stage with those of plants at maturity.Keywords: P uptake, P harvest index, P utilization efficiency, relative yield

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Section: Discussionsupporting

confidence: 86%

Screening Chinese Wheat Germplasm for Phosphorus Efficiency in Calcareous Soils

Wang

et al. 2005

Journal of Plant Nutrition

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“…The best genotypes from this study took up an amount of P equivalent to 55% of that from Ca-P, suggesting that more studies should be carried out to identify genetic stocks in which P uptake from Fe-P is comparable to that from Ca-P.. To our knowledge there were no reports of genotypic variation in P uptake from Fe-P in pigeonpea. Genotypic variation in P uptake from low-P soils has been reported in white clover (Dunlop et al 1990), sorghum (Clark et al 1977), and beans (Whiteaker et al 1976;Thung et al 1990). The present study indicates that higher P uptake from Fe-P may be found across maturity groups in pigeonpea.…”

Section: Discussionmentioning

confidence: 99%

“…This fact particularly applies to soils with a high iron or aluminum oxide content, where P is strongly bound and largely unavailable for crop uptake (Ae et al 1990a). Also, P fixation is a serious problem in many parts of the world as only a small fraction of the applied fertilizer P is usually taken by the crop; the rest is being fixed by the soil and not available to most crops, thus necessitating the continuous application of fertilizer P (Thung 1990). In many of the so-called P-deficient soils across the world, total soil P levels are 40-100 fold higher than the crop requirements, but P is unavailable to the crops because of its fixed state (Weir 1972(Weir , 1977.…”

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confidence: 99%