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Developing soil matric potential based irrigation strategies of direct seeded rice for improving yield and water productivity

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Title Developing soil matric potential based irrigation strategies of direct seeded rice for improving yield and water productivity
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Creator Satyendra Kumar
Bhaskar Narjary
Kapil Kumar
H.S. Jat
S.K. Kamra
R.K. Yadav
 
Subject Soil matric potential
Irrigation strategy
Water productivity
Direct seeded rice
 
Description Not Available
Water and labour scarcity besides increasing cost of cultivation in transplanted puddle rice (TPR) warrants to
develop and adopt input use efficient and cost effective direct seeded rice (DSR) method of cultivation. Though
DSR saves substantial amount of irrigation but there are contradictory observations on yield realization.
Therefore, a two year field study was undertaken with the aim to develop efficient irrigation strategy for
maximizing tilled DSR yield with minimum irrigation input. Total 08 irrigation strategies, based on 03 soil
matric potential (SMP) levels (−15, −30 and −45 kPa) and their combinations based on crop growth stages,
were evaluated for fine grain aromatic (Basmati) rice variety ‘CSR30’. Responses of respective irrigation strategies
were evaluated on crop water use and its components, biometric parameters and yield attributes and yield
of DSR. Performance of DSR was also compared with standard TPR practice. Soil profile moisture content ranged
from 32 to 39, 27–39 and 22–39% in−15,−30 and−45 kPa irrigation regimes, respectively. Irrigation input in
DSR method of cultivation varied between 709–1541mm as compared to 1807mm of TPR. With different irrigation
strategies, DSR grain yield and irrigation water productivity (IWP) varied from 1.72 to 2.89 Mg/ha and
0.19–0.24 kg/m3, respectively. Irrigation threshold −15 kPa at all stages in DSR produced the highest yield and
crop water productivity (CWP; 0.48 kg/m3), but with lowest IWP. Irrigations at or below −30 kPa during initial
phase (< 90 DAS) and at−15 kPa during remaining period produced comparable yield with significantly higher
IWP. Though TPR registered lower IWP (0.18 kg/m3) as compared to the best DSR treatment but recorded about
11% higher grain yield with significantly higher crop water productivity (0.58 kg/m3) than DSR. Water balance
studies revealed better utilization of precipitation in DSR due to irrigations at more negative SMP. Overall, study
suggests irrigation scheduling at
ICAR
 
Date 2019-10-15T04:01:28Z
2019-10-15T04:01:28Z
2019-01-09
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/23357
 
Language English
 
Relation Not Available;
 
Publisher Elsevier