The contribution of varietal tolerance for problem soils to yield stability in rice

Mahadevappa, M. and Ikehashi, H. and Ponnamperuma, F.N. (1979) The contribution of varietal tolerance for problem soils to yield stability in rice. Other. IRRI, Philippines.

[img] PDF
Restricted to ICRISAT researchers only


The reactions to P deficiency, Zn deficiency and Fe toxicity in wetland rice and iron deficiency in dryland rice of tolerant and sensitive genotypes of comparable yield potential were studied in the field in the 1978 dry and wet seasons and the 1979 dry season. The tests were conducted at three stress levels, viz. no stress, mild stress and severe stress. Tolerance varied widely with the stress level and the genotype. Sensitive rices suffered severe yield losses even under mild stress, whereas tolerant rices resisted the yield decline until the stress became moderate. Under severe stress, both tolerant and sensitive genotypes perished. The contribution of varietal tolerance to yield ranged from 0.5 to 0.8 t/ha for P deficiency, 0.5 to 1.5 t/ha for Zn deficiency, and 0.2 to 0.7 t/ha for Fe deficiency at yield levels of 2.5 to 4.0 t/ha. The results indicated the value of initial mass screening followed by field tests in identifying stress-tolerant rices, and revealed a higher uptake of the deficient elements by tolerant rices compared with sensitive ones

Item Type: Monograph (Other)
Author Affiliation: IRRI, Los Banos, Philippines
Subjects: Plant Production
Soil Science and Microbiology > Soil Sciences
Divisions: Other Crops
Depositing User: Ms K Syamalamba
Date Deposited: 15 Oct 2012 05:39
Last Modified: 15 Oct 2012 05:39

Actions (login required)

View Item View Item