Grain Yield of Rice Cultivars and Lines Developed in the Philippines since 1966
S. Penga,
R.C. Lazaa,
R.M. Visperasa,
A.L. Sanicoa,
K.G. Cassmanb and
G.S. Khushc
a Agronomy, Plant Physiology and Agroecology Division, International Rice Research Institute (IRRI), P.O. Box 3127, MCPO, 1271 Makati City, Philippines
b Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583 USA
c Plant Breeding, Genetics, and Biochemistry Division, IRRI, Lincoln, NE USA
View larger version (20K):
[in a new window]
|
Fig. 1 Relationship of grain yield (0.14 g H2O g-1 fresh weight) with harvest index (A) and total dry matter (B) for the old cultivars released before 1980 and for the new cultivars–lines developed after 1980. The twelve cultivars–lines were grown at the International Rice Research Institute (IRRI) farm and the Philippine Rice Research (PhilRice) farm in the dry season of 1996. Each data point is a mean of four replications within each location
|
|
View larger version (15K):
[in a new window]
|
Fig. 2 Yield (0.14 g H2O g-1 fresh weight) trend of cultivars–lines developed since 1966. (A) Twelve cultivars–lines were grown at the International Rice Research Institute (IRRI) farm and the Philippine Rice Research (PhilRice) farm in the dry season of 1996. Each data point is a mean of the two locations. The relationship between grain yield and the year of release for each location was: y = -101 + 0.056x, r2 = 0.52 (IRRI); y = -176 + 0.093x, r2 = 0.60 (PhilRice). (B) Seven cultivars–lines were grown at IRRI farm in the dry season of 1998. Vertical, capped lines represent standard error
|
|
Copyright © 2000 by the Crop Science Society of America.
