Effect of minimun and conventional tillage in bean (Phaseolus vulgaris L.) in the Northern Huetar Region in Costa Rica.

Abstract

The work was conducted in the northern area of

Costa Rica where two plots were sown: one of minimum

tillage (1.85 ha) and another of conventional tillage (2 ha).

Both tillage systems were planted with a hydraulic sower

fertilizer. The sown variety was the Brunca. The population of

bean plants evaluated during the vegetative stage was of 9.37

plants/lineal meter in minimum tillage, and of 9.55

plants/lineal meter in conventional tillage. The weed density

was larger under conventional tillage and the most prevalent

weeds were Richardia scabra, Rottboellia cochinchinensis y

Spermacoce sp. The dry weight of weeds was of 37.6 g of

weed/frame of 0.25 m2 in minimum tillage, while in the

conventional tillage it was of 46.4 g of weed/frame. The

incidence and severity of web-blight (Tanatheporus

cucumeris) in the system of minimum tillage was of 42.8%

and of 0.83, respectively, while in conventional tillage it was

of 52.2% and 1.22, respectively. In the system of minimum

tillage the yield was of 930 kg/ha, and in conventional of 676

kg/ha.