Login
Toggle navigation
Home
ICPA
Conference
Abstract Management
Abstract Topic Groups
Author Instructions
Registration
Registration Information
16th ICPA - Conference Registration
Registrants Map
Hotel and Travel Information
Tour
Workshops
Sponsors
Become A Sponsor
16th ICPA Sponsors
Conference Program
General Outline
Oral Program
Awards
Proceedings
Leadership
ISPA Leadership
Officers
Past Presidents
Officer Responsibilities
Country Representatives
Election Candidates
Communities
Community Guidance
On-Farm Experimentation
Nitrogen
Latin America
Economics
African Association for Precision Agriculture
Membership
ISPA Member Benefits
Membership Form
Events
ISPA Events
ACPA
ACPA Proceedings
AfCPA
AfCPA Proceedings
CLAP
CLAP Proceedings
ECPA
ECPA Proceedings
ICPA
ISPA Webinars
OFE
AAPA
Latin American
Robotics and Automation Symposium
Event Overview
Registration
Program
Venue
Speakers
About ISPA
Newsletters
History
Jobs
Precision Ag Definition
Agriculture Course Database Submission
Publications
ICPA Proceedings
ECPA Proceedings
Contact Us
Members
Suggestion Form
Conference
Abstract Management
Abstract Topic Groups
Author Instructions
Registration
Registration Information
16th ICPA - Conference Registration
Registrants Map
Hotel and Travel Information
Tour
Workshops
Sponsors
Become A Sponsor
16th ICPA Sponsors
Conference Program
General Outline
Oral Program
Awards
Proceedings
Proceedings
Search
Authors
Topics
Years
Types
Find matching any:
Reset
» Add more topics
Add filter to result:
Response Of Rhodes Grass (Chloris Gayana Kunth) To Variable Rate Application Of Irrigation Water And Fertilizer Nitrogen
1
V. Patil,
1
R. Madugundu,
1
E. Tola,
1
S. Marey,
2
D. J. Mulla,
1
S. K. Upadhyaya,
1
K. A. Al-Gaadi
1. King Saud University
2. University of Minnesota
3. University of California, Davis
Rhodes grass is cultivated extensively in Saudi Arabia under center pivot sprinkler irrigation system. The research work was carried out to optimize irrigation water and fertilizer nitrogen levels for the crop. The objectives of the study were:
1. To delineate the field in to management zones, 2. To study the effects of variable rate application (VRA) of irrigation water and fertilizer nitrogen on the yield of Rhodes grass. A field experiment was carried out from June to November 2012, in a 50 ha farmer's field irrigated by center pivot. The experimental field was divided in to two management zones (MZ). Spilt-split plot design was employed with MZ as two main treatments. Sub-treatments were: Irrigation at 100, 80, 60 and 40 % crop evapotranspiration (ETc); and Sub-sub treatments were: 240, 480, 720, 960 and 1200 kg N per ha. The mean productivity across three cuts was higher in MZ 2 (8.16 t/ha/cut) than in MZ 1 (7.26 t/ha/cut). The effects of treatments were significant in the last two cuts but not in the first cut. Significant differences between the management zones were observed only with respect to nitrogen levels but not with respect to irrigation levels. However, deficit irrigation was found to be beneficial in both the zones. Across the zones, irrigation at 80 and 60 % ETc resulted in higher hay yields in second and third cuts, respectively. By increasing the nitrogen level from 240 to 480 kg per ha, the hay yield increased from 7.58 to 8.46 t/ha/cut, only in MZ 2, indicating the possible benefit of variable rate application of fertilizer nitrogen. Based on this study, the following conclusions can be drawn: 1. Deficit irrigation can be adopted in Rhodes grass by irrigating the crop at 80 % ETc for the first two cuts and at 60 % ETc for the last/subsequent cuts. 2. Fertilizer nitrogen use can be optimized by adopting VRA technology.
V. Patil
R. Madugundu
E. Tola
S. Marey
D. J. Mulla
S. K. Upadhyaya
K. A. Al-gaadi
Precision Nutrient Management
Oral
2014
Download paper