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Rice root growth, photosynthesis, yield and water productivity improvements through modifying cultivation practices and water management.

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Title Rice root growth, photosynthesis, yield and water productivity improvements through modifying cultivation practices and water management.
Not Available
 
Creator Thakur, A.K., Mandal, K.G., Mohanty, R.K. and Ambast, S.K.
 
Subject Alternate wetting and drying (AWD) Crop management Physiology Rice (Oryza sativa L.) System of Rice Intensification (SRI)
 
Description Not Available
ABSTRACT
Achieving higher productivity in irrigated rice production is becoming ever-more important. A modified ricecultivation method, the System of Rice Intensification (SRI), recommends keeping rice fields moist but unflooded
during the crop’s vegetative stage, usually with alternate-wetting-and-drying (AWD), then maintaining shallow
flooding during the post-vegetative stage of crop growth. However, no evidence is available on how flooding
paddy fields continuously vs. alternately during the post-vegetative stage under SRI might influence the crops’
physiology, root growth, grain yield, and water productivity.
Field experiments were conducted to investigate the impacts of two alternative crop management systems,
namely, SRI and conventional management practice (CMP) under different water management treatments
during the vegetative stage [continuous flooding (CF) vs. AWD] and then during post-vegetative stage: CF vs.
AWD @ 1-DAD (days after disappearance of ponded water), 3-DAD or 5-DAD.
SRI practices, compared to CMP methods, significantly improved plants’ root growth and xylem exudation
rate, leaf area index and light interception by the crop canopy, plus photosynthesis rate at the grain-filling stage,
resulting in higher grain yield. Overall, this modified method of rice crop management produced 58% higher
grain yield with 16% less water. Across all water management treatments, significantly more grain was produced
per unit of water applied with SRI management (6.3 kg ha-mm−1
) compared to CMP (3.3 kg grain ha-mm−1
).
The highest grain yield with SRI (6.2 t ha−1
), and the greatest water productivity (6.7 kg ha-mm−1
) were obtained with SRI and 3-DAD post-vegetative irrigation. With CMP, highest grain yield (4.1 t ha−1
) and water
productivity (3.5 kg ha-mm−1
) were with 1-DAD irrigation.
Differences measured in plants’ response to modified management practices and alternative irrigation schedules indicated how phenotypic and physiological performances can be improved for a given genotype.
Combining changes in crop and water management can improve water productivity as well as grain yield.
Not Available
 
Date 2019-11-06T08:08:21Z
2019-11-06T08:08:21Z
2018-05-08
 
Type Article
 
Identifier Thakur, A.K., Mandal, K.G., Mohanty, R.K. and Ambast, S.K. 2018. Rice root growth, photosynthesis, yield and water productivity improvements through modifying cultivation practices and water management. Agricultural Water Management, 206:67-77.
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/24513
 
Language English
 
Relation Not Available;
 
Publisher Elsevier