Performance of snap beans varieties in lowland of Morogoro in Tanzania
Snap beans (Phaseolus vulgaris L.) are among the important vegetable crops grown in Tanzania, but the yield is low (2 to 8 t ha-1) as snap beans mostly are grown in highland of that country. The aim of the study was to evaluate the growth and yield of snap bean varieties in lowland areas of Morogoro, in Tanzania. The trial was conducted in 3 different seasons at Sokoine University of Agriculture (SUA) from 13th July 2010 to 25th June 2011. Four snap bean varieties (Serengeti, Teresa, HS 215 and HS 217) were tested in a randomized complete block design replicated three times. Measurements were recorded including plant height, branches number, harvesting duration and pods weight per plant. Collected data were subjected to ANOVA, mean separation was done based on Student-Newman-Keuls using statistical software COSTAT6.4 (p≤5%). The results showed that seasons differed significantly (p≤ 0.001) and first season gave the tallest plant (49.65 cm), highest pods weight per plant (193.33g), longer harvesting duration (23.40 days) but branches number were equal in all seasons. Snap bean varieties also varied in their performance, with the tallest height, longest period of harvest and highest pods weight per plant observed in Teresa variety; while the contrast was observed in HS 217 in almost all seasons. From these results, growing snap bean especially Teresa variety in season one gave high yield and best pods quality compared to other seasons. Therefore, it is advised to the farmers of Morogoro to maximize their income and yield from snap bean varieties by growing them in season starting from July up to September.
Keywords: Snap beans (Phaseolus vulgaris L.), high temperature, lowland, growth, yield
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