M. S. Islam
Principal Scientific Officer
IWM Division, BARI, Gazipur
M. M. Hossain
Scientific Officer
RARS, Jamalpur
RARS, Jamalpur
Chief Scientific Officer
RARS, Jamalpur
M.A. Hossain
Scientific Officer
IWM Division, BARI, Gazipur
Experiment was conducted with potato variety, Diamant, during Rabi seasons of 2004-2005 and 2005-2006 to investigate the yield and scab infestation under different irrigation frequencies and quantities. Three irrigation intervals i.e. 7, 12 and 17 days along with three levels of water quantities equaling 50, 100 and 150% of depleted soil moisture were tested for yield and scab infestation of potato tubers. It was observed in 2004-2005 that irrigation interval of 12 days and watering at 100% depletion of soil moisture produced the highest fresh and total yields of 24.64 t/ha and 27.56 t/ha, respectively, whereas irrigation interval of 7 days and watering at 150% of depleted soil moisture produced the lowest fresh and total yields (21.68 t/ha and 25.98 t/ha, respectively). In 2005-2006, the total and fresh yields (27.41 t/ha and 26.27 t/ha, respectively) were not found statistically different from those obtained under water application of 150% and irrigation interval of 12 days. The scab infestation was observed the highest, 4.30 and 2.97 t/ha for water application of 150% depleted soil moisture and 7 days irrigation intervals in the first and second years, respectively. This indicates that scab disease is more susceptible to frequent over irrigation.
Potato, Irrigation interval, irrigation regime, scab infestation
Regional Agricultural Research Station, Jamalpur
Crop-Soil-Water Management
The present study was undertaken to observe the effect of irrigation interval and quantity of water on the yield and extent of scab disease of potato variety, Diamant.
The experiment was conducted during the rabi seasons of 2004-2005 and 2005-2006 in the research field of Regional Agricultural Research Station, Jamalpur. The soil belongs to the Brahmaputra flood plain. Texturally, it is sandy loam. The field capacity of soil is 30% and the bulk density, 1.5 gm/cm3. The selected crop was potato and the variety was Diamant. The plot size was 3m×3m. Each treatment was replicated thrice. The following treatments were arranged in a randomized block design:
T1=Irrigation at 7 days interval and 50% depleted soil moisture
T2=Irrigation at 7 days interval and 100% depleted soil moisture
T3=Irrigation at 7 days interval and 150% depleted soil moisture
T4=Irrigation at 12 days interval and 50% depleted soil moisture
T5=Irrigation at 12 days interval and 100% depleted soil moisture
T6=Irrigation at 12 days interval and 150% depleted soil moisture
T7=Irrigation at 17 days interval and 50% depleted soil moisture
T8=Irrigation at 17 days interval and 100% depleted soil moisture
T9=Irrigation at 17 days interval and 150% depleted soil moisture
The land was prepared and seeds were sown on 05 December 2004 and 8 December 2005. Row spacing was 60 cm and plant spacing, 25 cm. Whole tubers were planted. Furrow and ridge method of water application was used in the experiment.
The water was applied for the treatment irrigated at 100 % depletion of soil moisture. Those for the treatments irrigated at 50% and 150% depletion of soil moisture were calculated as half and 1.5 times this amount, respectively. The intervals between irrigations were maintained as per design of the treatments, i.e. 7, 12 and 17 days. Number of stem/hill, plant height, yield of tubers and number and weight of scab affected potato tubers were recorded. The harvested tubers were then checked for scab disease.
Annual Research Report 2005-2006, IWM, BARI
From this study, it was know that the scab disease infestation becomes prominent when 7 days irrigation intervals were set. Also for the same frequency of irrigation but different water application regimes, the rate of infestation varied. Over irrigation induced the disease most. But the infestation rate was found to reduce with the increase of irrigation intervals for the same irrigation regimes.
Report/Proceedings