Effects of partial rootzone drying on yield, yield components, and irrigation water use efficiency of canola (Brassica napus L.)

Abstract

Effect of PRD (partial rootzone drying) on yield and yield components of canola (Brassica napus L.) was investigated in greenhouse conditions. The treatments were: T 1 , full watering of both sides of roots; T 2 , alternate irrigation on both sides; T 3 , half of irrigation water in T 1 was given to one side; T 4 , same as T 3 but without plate; T 5 , same as T 2 but without plate. In T 1 , T 2 , and T 3 treatments, the boxes were evenly separated into two compartments with thin plates. The results showed that grain yield of T 1 to T 5 treatments was 18.11, 16.38, 12.44, 9.29, and 8.66 g plant -1 . T 2 treatment increased plant height by 46.9% and 1000-seed weight by 17.8%, but reduced lateral branches by 16.7% and number of pods by 24%, over T 1 treatment. T 2 treatment was the most efficient (irrigation water use efficiency = 0.679 kg m -3 ) and treatment T 5 was the least efficient (0.359 kg m -3 ). The difference between irrigation water use efficiency (IWUE) of T 2 and T 5 , and T 3 and T 4 treatments, was significant (p \ 0.05). Therefore, halving the amount of applied irrigation water and applying this water alternatively on both sides of the root zone will produce the highest IWUE. This study showed that PRD irrigation management has high influence on rooting system of canola. This phenomenon could affect nutrients uptake and consequently all aspects of plant growth and development.

Seed Yield and Water Productivity of Irrigated Winter Canola (Brassica napus L.) under Semiarid Climate and High Elevation

“…IWUE varied with year, with no correlation between IWUE and the seasonal irrigation amounts. The results of this study are in agreement with Mousavi et al [60], who reported that the IWUE for winter canola varied from 0.36 kg/m 3 for the least efficient irrigation regime to 0.67 kg/m 3 for the most efficient irrigation regime, under greenhouse conditions. Majnooni-Heris et al [61] reported spring canola IWUE values varying from 0.36 to 0.43 kg/m 3 under different irrigation regimes at the Agriculture and Natural Resources Research Center of Yazd city, Iran.…”

Effects of partial root‐zone irrigation and nitrogen forms on the movement of nitrate in deep subsoil and its utilization by tomato plants

“…The use of APRI has been reported for many crops (e.g. maize, tomatoes, cotton and grapes) (Intrigliolo & Castel, ; Li, Yu, Nong, Kang, & Zhang, ; Mousavi, Soltani‐Gerdefaramarzi, & Mostafazadeh‐Fard, ; Wang, Liu, Mathiasn, & Christianr, ). Furthermore, previous reports have shown that APRI can reduce irrigation water consumption and stimulate soil water lateral flow, thereby decreasing N leaching and enhancing crop N uptake (Li et al, ; Li, Zhang, & Jia, ; Skinner, Hanson, & Benjamin, ; Wang et al, ).…”

Physiological Responses of Greenhouse-grown Drip-irrigated Chile Pepper under Partial Root Zone Drying

“…3B). Mousavi et al (2010) also reported maximum height in alternate PRD treatment among five irrigation treatments for canola (Brassica napus L.) plants. The plant height differences within treatments and growing seasons were not significant (P # 0.05) during both growing seasons ( Fig.…”