The response of snap beans to soil fertility was studied. Seven breeding lines (Hav 13, Hav 38, Hav 40, Hav 49, Hav 56, Hav 64 and Hav 68), and the cultivars Favorito Ag 480, Macarrão Bragança and Teresópolis Ag 484 were evaluated in seven NPK formulations (4-30-16), as basal fertilization (D0= 0; D1=200; D2=400; D3=600; D4=800; D5=1,000 and D6=1,200 kg/ha). There were significant differences among genotypes for all evaluated characteristics within each modified environment, except for yield, in the fifth level and for plant height in the highest fertility level. The breeding lines Hav 49 and Hav 64 produced as much as the higher yielding genotypes in all environments. The intermediate fertility level was the most advantageous under the economic viewpoint, for all considered characteristics. The genotypes were stable, except Hav 13 and Teresopolis Ag 484, unforeseeable in yield, Hav 13 and Hav 64, unforeseeable regarding to number of pods per plant and Favorito Ag 480, regarding to plant height. All genotypes presented a proportional response to environment improvement regarding to yield, number of pod per plant and plant height. The breeding line Hav 40 showed adaptability to lower fertility, while the cultivar Teresopolis Ag 484 showed to be adapted to higher fertility conditions, both of them regarding to pod medium weight.
Phaseolus vulgaris; adaptability; stability
