Phosphorus deficiency is one of the most growth-limiting factors in acid soils in various parts of the world. The objective of this study was to screen 25 rice cultivars (Oryza sativa L.) at low, medium, and high levels of soil P. Number of tillers, root length, plant height, root dry weight and shoot dry weight were related to tissue P concentrations, P uptake and P-use efficiency. Shoot weight was found to be the plant parameter most sensitive to P deficiency. Significant cultivar differences in P use efficiency were found. Phosphorus use efficiency was higher in roots than shoots and decreased with increasing levels of soil P. Positive correlations were found among growth parameters such as plant height, tillers, root and shoot weight, and P content of roots and shoots. These results indicate selection of rice cultivars for satisfactory performance under low P availability can be carried out using shoot and root dry weight as criteria.
Key wordsOryza sativa L. P uptake P use efficiency root and shoot weight
Unable to display preview. Download preview PDF.
- Baligar V C and Barber S A 1979 Genotypic differences of corn for ion uptake. Agron. J. 71, 870–873.Google Scholar
- Clark R B and Brown J C 1975 Corn lines differ in mineral efficiency. Ohio Rep. 60, 83–86.Google Scholar
- Fageria N K 1976 Effect of P, Ca, and Mg concentration in solution culture on growth and uptake of these ions by rice. Agron. J. 68, 726–732.Google Scholar
- Fageria N K and Barbosa Filho M P 1982 Screening rice cultivars for low level of phosphorus tolerance. R. Bras. Ci. solo. 6, 146–151.Google Scholar
- Fageria N K, Barbosa Filho M P and Carvalho J R P 1982a Response of upland rice to phosphorus fertilization on an oxisol of central Brazil. Agron. J. 74, 51–56.Google Scholar
- Fageria N K, Barbosa Filho M P and Garber M J 1982b Adequate nutrient levels and plant density for the rice experiments under greenhouse conditions. Pesq. agropec. bras. Brasilia. 17, 1279–1284.Google Scholar
- Haynes R J 1984 Lime and phosphate in the soil-plant system. Adv. Agron. 37, 249–315.Google Scholar
- Nielsen N E and Barber S A 1978 Differences among genotypes of corn in the kinetics of P uptake. Agron. J. 70, 695–698.Google Scholar
- Sanchez P A and Salinas J G 1981 Low input technology for managing oxisols and ultisols in tropical America. Adv. Agron. 34, 279–398.Google Scholar
- Yost R S, Kamprath E J, Lobato E and Naderman G C 1979 Phosphorus response of corn on an oxisol as influenced by rates and placement. Soil Sci. Soc. Am. J. 43, 338–343.Google Scholar