Root growth, water potential, and yield of irrigated rice

Mishra, Himanshu; Rathore, T. S.; Pant, Chudamani

doi:10.1007/s002710050024

Cited by 36 publications

(16 citation statements)

References 15 publications

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“…Some previous reports on the effects of stopping flooding have suggested that there is a significant decrease in dry matter production and in the grain yield for rice under unsaturated soil moisture conditions (McCauley 1990;Mishra et al 1997). This could be due to a loss of soil nitrogen associated with nitrification and denitrification processes (Sah and Mikkelsen 1983).…”

Section: Introductionmentioning

confidence: 97%

Rice root growth and physiological responses to SRI water management and implications for crop productivity

Mishra

Salokhe

2010

Paddy Water Environ

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This paper reports on several research findings on rice root responses, in terms of growth and physiology, manifested when applying System of Rice Intensification water management principles under semi-field and field conditions, in conjunction with variations in plant density and microbial density in the soil. The research aimed to learn about causal relationships, if any, between rice root and shoot growth at different growth stages of the rice plant's development and their cumulative effect on yield, which is affected by both biotic and abiotic influences. It was seen that greater root length density and a higher rate of root activity affected the yield-contributing parameters in all of the trials, whether conducted under semi-field or field conditions. At the same time, both root parameters were significantly affected by the water regime, soil microbial density, and planting pattern, the three main factors considered. The most important finding observed under semi-field conditions was that enhanced microbial density in the soil improved the sink capacity of the rice plants under all water regimes evaluated. Positive correlations were found between the chlorophyll content of the flag leaf and the duration of grain filling, between the chlorophyll content of plants' lower leaves and their roots' oxidizing activity rate, and the roots' oxidizing activity rate at later growth stage and the available soil nitrogen. These relationships can significantly improve rice plants' physiological efficiency and hence grain yield, provided that soil nutrients are not a limiting factor and when source-sink demand is maintained simultaneously. To realize the highest crop yield per hectare, both planting pattern and spacing are factors that need to be optimized. This paper in its conclusion considers the relevance of exploiting roots' potential for plasticity to enhance crop productivity in the context of impending water constraints and climate-change effects.

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Section: Introductionmentioning

confidence: 97%

Rice root growth and physiological responses to SRI water management and implications for crop productivity

Mishra

Salokhe

2010

Paddy Water Environ

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“…The exception is the rice yields from this study which are significantly lower in the Indian State of Madhya Pradesh. This is because the yields provided by Mishra et al (1997) were recorded from controlled field experiments which are relatively high, while statistical values generally show low values but high variation within the State. The estimated yields and the actual yields measured from field campaigns carried out in this study have a coefficient of determination (R 2 ) at 0.44 (sample size 30).…”

Section: Accuracy and Uncertainty Analysismentioning

confidence: 99%

An assessment of crop water productivity in the Indus and Ganges River Basins: current status and scope for improvement

Cai¹,

Sharma²,

Matin³

et al. 2010

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RESEARCH IWMI R E P O R T I n t e r n a t i o n a l Water Management I n s t i t u t e years IWMI Celebrating Research ReportsThe publications in this series cover a wide range of subjects-from computer modeling to experience with water user associations-and vary in content from directly applicable research to more basic studies, on which applied work ultimately depends. Some research reports are narrowly focused, analytical and detailed empirical studies; others are wide-ranging and synthetic overviews of generic problems.Although most of the reports are published by IWMI staff and their collaborators, we welcome contributions from others. Each report is reviewed internally by IWMI staff, and by external reviewers. The reports are published and distributed both in hard copy and electronically (www.iwmi.org) and where possible all data and analyses will be available as separate downloadable files. Reports may be copied freely and cited with due acknowledgment. About IWMIIWMI's mission is to improve the management of land and water resources for food, livelihoods and the environment. In serving this mission, IWMI concentrates on the integration of policies, technologies and management systems to achieve workable solutions to real problems-practical, relevant results in the field of irrigation and water and land resources.

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“…Increased ET was probably due to enhanced root activity and root development as a result of a faster decrease in the water table depth during drainage periods under more intense drainage systems. A deeper water table causes roots to grow vertically into deeper soil horizons, whereas in wetter systems, roots grow more horizontally (Mishra et al, 1997). Deeper roots increase water extraction from the soil profile during drying periods.…”

Section: Water Balance Analysismentioning

confidence: 99%

Numerical modeling of soil water dynamics in subsurface drained paddies with midseason drainage or alternate wetting and drying management

Darzi‐Naftchali

Karandish

Šimůnek

2018

Agricultural Water Management

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Root growth, water potential, and yield of irrigated rice

Cited by 36 publications

References 15 publications

Rice root growth and physiological responses to SRI water management and implications for crop productivity

Rice root growth and physiological responses to SRI water management and implications for crop productivity

An assessment of crop water productivity in the Indus and Ganges River Basins: current status and scope for improvement

Numerical modeling of soil water dynamics in subsurface drained paddies with midseason drainage or alternate wetting and drying management

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