Thumbnail Image

Theses

Browse

20192
Reset filters
Subject: Soil and Water Engineering × End date: 2019 × Start date: 2019 × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    Nitrogen fertigation studies on onion crop under saline water
    (CCSHAU, 2019) Yadav, Nikita; Sanjay Kumar
    A two year study was conducted to study the effect of irrigation water quality and N fertigation level on yield and growth parameter of onion during Rabi season of 2018-19 and 2019-20. Three irrigation water quality treatment namely good quality, EC 2.5 dS m-1 and 5 dS m-1 and three N fertigation level i.e. 75, 100 an 125% RDN were applied in Split Plot Design with three replication in the micro plots of size 2x2 m at the experimental field of Soil Science, CCS Haryana Agricultural University, Hisar, Haryana, India. During the experiment, parameters like polar and equatorial diameter of bulb, height of plant, no. of leaves, weight of bulb, bolting percentage, and yield of bulb was observed. IWUE and NUE was also evaluated on the basis of yield, amount of water and fertilizer applied. Moisture content in the soil profile increased with the increase in the salt concentration of irrigation water (EC) and a decrease in moisture content was with an increase in N fertigation level. In addition to it, accumulation of salt at dripper was less and the level of salt increased while moving away from the emitting source (dripper) which verified that drip system has the capability to draw the salts away from the dripper. Maximum polar and equatorial diameter of bulb, height of plant, no. of leaves, weight of bulb and bolting percentage was observed under irrigation with good quality water at 125% RDN followed by fertigation at 100% RDN under irrigation with good quality water. Maximum yield was observed at 125% RDN followed by 100% RDN under irrigation with good quality water though the yield at 125% RDN was not significantly higher than at 100% RDN under irrigation with good quality water. Yield at irrigation with water of 2.5 and 5 dS m-1 was 9.7 and 33.62% less than at irrigation with good quality water. under irrigation with good water quality, irrigation water use efficiency was found to be highest (18.88 kg m- 3) and at 125% RDN which is at per at 100% RDN. On the other hand maximum NUE was observed under irrigation with good quality water at 75% RDN. On the basis of quality, IWUE, NUE and yield of onion, irrigation with good water quality treatment at 100% RDN can be suggested in sandy loam soils. Whereas for water scares area underlain by brekish water, treatment consist of irrigation water of 2.5dS m-1 at 125% RDN can be suggested which is 8.35% lesser than yield at irrigation with good quality water at 100% RDN.
  • Thumbnail Image
    ThesisItemOpen Access
    Optimization of irrigation frequency for onion crop under subsurface drip system
    (CCSHAU, 2019) Ashish Kumar; Sanjay Kumar
    An experiment was conducted to study the effect of lateral spacing (45 cm and 60 cm) and drip irrigation frequencies (one, two, three and four days) on onion crop (Agrifound dark red variety) during kharif season 2018 in micro plots (2 m x 2 m) constructed in lab area of Department of Soil and Water Engineering, COEA&T, CCSHAU, Hisar, Haryana, India. For 60 DAT, in daily irrigation at 45 cm lateral spacing, available moisture (9.78 cm) in the root zone (0-60 cm) at the middle of two laterals was observed higher (15.6%) than at 60 cm lateral spacing where available moisture was 8.46 cm. The highest yield in A (> 5.0 cm), B (4.0-5.0 cm) and C (3.0-4.0 cm) grade of onion was observed as 0.76, 0.54 and 0.31 kg m-2 in two days irrigation frequency with 45 cm lateral spacing. The highest marketable yield of onion (155.23 q ha-1) was observed in two days irrigation frequency with lateral spacing of 45 cm. Among the different treatments, lowest unmarketable yield was observed in two days irrigation frequency with lateral spacing of 45 cm. These parameters show that better quality of onion was obtained in this treatment. The highest yield of onion (175.67 q ha-1) was obtained in two days irrigation frequency with lateral spacing of 45 cm which was 16.8% higher than two days irrigation frequency with lateral spacing of 60 cm. Irrigation water use efficiency was found to be highest (10.23 kg m-3) in two days irrigation frequency with lateral spacing of 45 cm. On the basis of moisture distribution pattern, better quality and highest yield of onion, two days irrigation frequency with 45 cm lateral spacing is the most preferable treatment in sandy loam soils.