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DIFFERENCES IN PHOSPHORUS UPTAKE, DISTRIBUTION, AND USE BY SORGHUM GENOTYPES GROWN WITH LOW PHOSPHORUS
Abstract
Sorghum (Sorghum bicolor (L.) Moench) genotypes were grown in nutrient solutions and in soils at low P under greenhouse conditions to determine genotype differences for dry matter yields, P concentrations and contents, dry matter produced per unit P, P distribution among parts, P uptake rates, and intake root phosphatase activities. Genotypes grown in nutrient solutions with organic sources of P (ethylammonium-, glyceryl-, and phenyl-phosphates) produced as much dry matter as plants grown with the inorganic sources of P KH(,2)PO(,4) and calcium tribasic phosphate and produced more dry matter when grown in soils. Plants grown with organic P compounds in both nutrient solutions and soil had higher P concentrations and contents than plants grown with inorganic P compounds. Phosphorus from organic sources was more readily available to plates than P from inorganic sources. Differences in growth and P use were noted among genotypes when a large number of plants (90 to 120 plants per container) were grown together in nutrient solution at 129 (mu)mole P liter('-1). Widest differences among genotypes for dry matter yields were noted for plants grown with ethylammonium-, glyceryl-, calcium tribasic-, and potassium dihydrogen phosphates. Plants grown with KH(,2)PO(,4) and calcium tribasic phosphate and nearly six-fold higher values for dry matter produced per unit P than plants grown with ethylammonium phosphate. Calcium tribasic phosphate and KH(,2)PO(,4) appeared to be the best P compounds to use to screen sorghum genotypes for tolerance to low P in nutrient solutions. NB9040 was the most tolerant and SC33-9-8E4 the least tolerant genotype to low P in both nutrient solutions and in soil. SC369-3-1JB, tolerant to low P in nutrient solution and in low P acid soil, did not grow well in a low P soil at pH 6.8. Regardless of P source, NB9040 and SC369-3-1JB (tolerant to low P) had lower root phosphatase activities and fewer P deficiency symptoms than SC33-9-8E4 and Ck60-korgi (intolerant to low P) at similar P levels. Plants grown with organic P sources had lower root phosphatase activities and fewer P deficiency symptoms than plants grown with inorganic P sources. Plant responses to P sources were: organic P sources
Subject Area
Agronomy
Recommended Citation
FURLANI, ANGELA MARIA C, "DIFFERENCES IN PHOSPHORUS UPTAKE, DISTRIBUTION, AND USE BY SORGHUM GENOTYPES GROWN WITH LOW PHOSPHORUS" (1981). ETD collection for University of Nebraska-Lincoln. AAI8118158.
https://digitalcommons.unl.edu/dissertations/AAI8118158