Response of onion with different irrigation frequency and lateral spacing under subsurface drip system
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Date
2021-08
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CCSHAU, Hisar
Abstract
An experiment was conducted to study soil water dynamics and yield response of onion crop
with irrigation frequencies (one, two, three and four days) and lateral spacing (45cm and
60cm) under subsurface drip irrigation during the spring summer season 2020 and 2021 in 2m
x 2m micro plots, built in the field area of Department of Soil and Water Engineering,
CCSHAU, Hisar, Haryana, India. At the middle of 45cm and 60cm lateral spacing with daily
irrigation, available moisture in the root zone (0-60cm) was 12.73cm and 12.33cm
respectively, which was higher by 3.14% in 45cm lateral spacing than 60cm. Average highest
(102.28 g) fresh weight of onion bulb and number of bulbs per m2 for grade A, B and C of
onion of two seasons was recorded in I2L45 treatment. Highest bulb yield of onion under grade
A (>5.0cm), B (4.0-5.0cm) and C (4.0-5.0cm) was recorded in I2L45 treatment, whereas its
lowest value under the respective grades was obtained in I4L60 treatment. Under two days
irrigation interval with 45cm lateral spacing (I2L45), the total bulb yield was obtained 9.98%
higher than 60cm lateral spacing (I2L60) treatment during year 2020, whereas, it was 9.22%
higher in year 2021. The highest (11.55 kg m-3 in 2020 and 10.09 kg m-3 in 2021) and lowest
(9.99 kg m-3 in 2020 and 9 kg m-3 in 2021) irrigation water use efficiency was observed in
I2L45 and I4L60 treatments, respectively. On the basis of soil water dynamics, superior quality
and highest yield of onion in sandy loam soil, it is concluded that subsurface drip irrigation
with two days irrigation interval with 45cm lateral spacing gives better performance as
compared to one, three and four days irrigation in 45 as well as 60cm lateral spacing.