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- W4285338252 abstract "To identify the most appropriate method of available phosphorus extraction from acid Alfisols of north east India, greenhouse pot experiments were conducted with two acid Alfisols (non-limed and limed), amended with six doses of P fertilization. Maize (Zea mays), as the test crop, was grown for 45 days, and the plant response was regressed against soil P availability estimated using 07 chemical extractants viz. Bray-1, Bray-2, Mehlich-1, Mehlich-3, Olsen’s reagent, water, and CaCl2. Suitability of extractants was adjudged based on their predictive ability (R2 values). Bray-1, Bray-2 and Mehlich-3 were the best predictors of plant dry matter yield and P uptake in both the soils, with their predictive ability being very close to each other. Mehlich-3 P was strongly correlated with Bray-1 values (r = 0.90** and 0.99** in untreated and limed soil, respectively). Limed soil had 33, 37 and 47% less Bray-1, Bray-2 and Mehlich-3 P, compared to non-limed soil. Averaged across the three best extractants (i.e. Bray-1, Bray-2, and Mehlich-3), critical P availability in limed soil was 32% lower than in untreated soil. Critical limits of plant P concentration ranged from 0.20 to 0.24%. Similar effectiveness in available P extraction and strong correlations between Bray-1 and Mehlich-3 values suggest that Mehlich-3 can effectively replace Bray-1 extractant without affecting the reliability of P testing in acid soils. Being a multinutrient extractant, adoption of Mehlich-3 can improve the rapidity and economy of soil testing." @default.
- W4285338252 created "2022-07-14" @default.
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- W4285338252 date "2021-11-01" @default.
- W4285338252 modified "2023-09-28" @default.
- W4285338252 title "Evaluation of phosphorus availability indices in acid Alfisols" @default.
- W4285338252 doi "https://doi.org/10.47815/apsr.2021.10089" @default.
- W4285338252 hasPublicationYear "2021" @default.
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