In April 1973 twelve rice cultivars were concurrently planted under upland and irrigated conditions. The ratio of grain yields under irrigation to those under upland conditions ranged from 1.16 to 6.31. Those with a high No" I adaptability ratio Here considered to have narrow adaptability. Those with relatively low ratio and with acceptable yields under both conditions.

Seed viability and emergence is one of the most important problems affecting soybean production in West Africa. Results from the multi-location yield trials indicated that introduced cultivars such as Bossier, Jupiter and Improved Pelican showed excellent adaptation and high yields provided seedling emergence was high and plant population was optimum. Diseases and insects are as yet not a major problem. An integrated approach on soybean emergence problem has been carried out by the IITA physiologist, ...