03388     2200241   4500001002100000005001500021007000300036008004100039020001800080035002000098082001000118084001600128100002500144245008100169260006800250300003100318520265900349650001903008650002303027700003103050710004903081990001603130INLIS00000000000032420240726031339ta240726                g          0 eng    a84-89206-69-4  a0010-0124000053  a634.5  a634.5 VAN s1 avan Schoonhoven Aart1 aStandard System for the Evaluation of Bean Germplasm /cAart van Schoonhoven  aColombia :bCentro Internacional de Agricultura Tropical,c1987  a53 hlm :bIllus ;c21,5 cm  aBeans are generally characterized by their unstable yields resulting from biological, climatic, and edaphic factors which affect plant growth and productivity. Beans are usually cultivated under rainfed conditions where diseases contribute considerably to low and unstable yields. To avoid disease pressures farmers frequently plant beans late in the season resulting in the possible exposure of bean plants to stress after flowering.

Most farmers in the tropics are unable to control biotic and abiotic factors which affect production through pur- chased inputs. As a result CIAT and national bean pro- grams are emphasizing the search for genetic variability to reduce the adverse effects of these biotic and abiotic factors on production. Since the number of problems that affect the bean crop is large, researchers in national and international programs have formed a network on genetic improvement in which germplasm evaluation and research results are exchanged.

This booklet presents a standard system for the evalua tion of bean germplasm under field conditions. The Centro Internacional de Agricultura Tropical (CIAT) Bean Pro- gram uses this system in Colombia and many countries in Latin America, Africa, and other regions to classify germ- plasm into useful and practical categories. The standard. ization of germplasm evaluation resulting from the use of the system will facilitate the exchange of research results among research institutions. This is important for an international collaborative network such as the one that exists for beans between CIAT and national programs.
A first draft of the standard system was presented for discussion to participants at the International Bean Trials Workshop held on 26-29 November 1984, in Cali, Colom bia. The modified draft was reviewed by many prominent international bean scientists. The revised version was presented for discussion at the 1985 Bean Improvement Cooperative Meeting in Oregon, USA, and all significant suggestions were incorporated. The United States Western Regional Research Committee (W-150) has also cooperated in the development of this standardized system; its partici pation has broadened the scope of this evaluation system and has resulted in its increased acceptance and applica tion. Where possible, all above suggestions have been included in this booklet. CIAT's Bean Program gratefully acknowledges these contributions.

For standard bean quality and nutritional evaluations refer to the Instituto de Nutrición de Centroamérica y Panamá (INCAP) publication Métodos para establecer calidad tecnológica y nutricional del frijol (Phaseolus vulgaris). 4aBean Germplasm 4aRak Tanaman Pangan1 aPastor-Corrales Marcial A.0 aCentro Internacional de Agricultura Tropical  a00000000349