Yield of onion and leaf purple blotch incidence as influenced by different levels of irrigation
2010
Biswas, S.K.,Bangladesh Agricultural Research Inst., Joydebpur (Bangladesh). Irrigation and Water Management Div. | Khair, A.,Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Irrigation and Water Management | Sarker, P.K.,Bangladesh Agricultural Research Inst., Joydebpur (Bangladesh). Irrigation and Water Management Div.
This study investigated if different levels of irrigation of Allium cepa had an influence on the level of leaf purple blotch incidence and bulb yields. Four irrigation levels were used as follows: irrigation at 10- (I1), 15- (I2), 20- (I3) and 30-day (I4) intervals along with a non-irrigated control (Io) treatment. A small difference in the score of leaf purple blotch disease in onion was found between the irrigated and non-irrigated plots. The highest level of disease infection (score: 1.96) was recorded in Io, and the lowest score (1.45) was found in I1. There was a trend to decrease the disease incidence with increasing number of irrigations. However, irrigation had insignificant effects on the disease incidence of onion. Irrigation significantly increased the yield of onion; the highest yields were obtained from treatments I1 and I2 associated with higher percentage of bulbs having size greater than 30 g. The lowest yield was recorded in Io. The total water use was 248 mm in treatment I1. The incremental benefit-cost ratio was the highest (28.36) in treatment I2.
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