Role of deficit irrigation strategies on ET partition and crop water productivity of rice in semi-arid tropics of south India

Anupoju, Varaprasad; Kambhammettu, B.V.N.P.

doi:10.1007/s00271-020-00684-1

Cited by 13 publications

(1 citation statement)

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“…Considering the agroclimatic and hydrogeological conditions, groundwater depletion in Kavarampur brings to question the choice to grow rice at all. For instance, Anupoju and Kambhammettu (2020) describe that water requirements for rice alone in India contribute to more than 50% of the available total annual groundwater supplies. Rice consumes 3000–5000 L of water per kg of grain, compared to around 900 L for rainfed crops (Reddy, 2021).…”

Section: The Political Economy Of Groundwater-led Agrarian Transforma...mentioning

confidence: 99%

Creating the ‘Rice Bowl of India’: Examining the political economy of groundwater-led agrarian transformation in dryland India

Karamchedu

2023

Environment and Planning E: Nature and Space

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This article explores the political economy of groundwater-led agrarian transformation in dryland India through the expansion of groundwater irrigation and rice production since the 1990s. Within this process, I speak to aspirations by subsistence farmers and imaginaries by state governments for agricultural commercialisation via expanding and investing in irrigation infrastructures. In India, this has largely been driven by private and decentralised investments by smallholder farmers. Theoretically adding to the literature on water infrastructures, development aspirations and groundwater governance, I find how farmer aspirations of rice cultivation and associations of the crop with food security and status drove the debt-laden and capital-intensive rapid adoption of groundwater irrigation in dryland Telangana, aided by specific discourses and electricity subsidies policies post the formation of the newest state in India in 2014. I find that political discourses of historical inequalities over water in the struggle for state formation of Telangana in 2014 mobilised electricity subsidies as a key lever to re-imagine the state as a rice bowl of India through groundwater expansion, producing uneven political economy and ecological repercussions for farmers. This article finds that while rice production increased in a short period in Telangana, it came at the expense of widespread well failures and indebtedness at the farmer and village level colliding with the fragile semi-arid climate and hard rock aquifer setting in the state, deepening distress and decay from depleted water infrastructures and failed aspirations.

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Section: The Political Economy Of Groundwater-led Agrarian Transforma...mentioning

confidence: 99%

Creating the ‘Rice Bowl of India’: Examining the political economy of groundwater-led agrarian transformation in dryland India

Karamchedu

2023

Environment and Planning E: Nature and Space

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Practical approaches to enhance water productivity at the farm level in Asia: A review

Meena,

Karnam,

Sujatha

et al. 2023

Irrigation and Drainage

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The global population is constantly increasing, reached 8 billion in November 2022 and is expected to reach 9 billion by 2037. This increased population is expected to increase the demand for food, clothing and shelter, which in turn are heavily dependent on limited water resources. The available freshwater resources for agricultural use are further declining due to overexploitation and changing climate in the major food baskets of the world. This increasing water scarcity is exacerbated by expanding cities due to increasing urbanization. This calls for a new look at the allocation of water to agriculture. Therefore, the development of new strategies to improve agricultural water use may serve as an important adaptation strategy. This review attempts to include a comprehensive review of the literature on (i) the status and definition of water productivity and (ii) factors responsible for low water productivity (WP) in Asian agriculture. Furthermore, it contains practical approaches to enhance water use efficiency at the farm level covering all field crops and a range of soil types, which include (i) agronomic interventions; (ii) genetic interventions, such as the identification and cultivation of crop cultivars with high WP; and (iii) genotype, environment and crop management interactions for higher WP.

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Comparative analysis of FAO dual Kc, Priestley‐Taylor and flux variance similarity methods in partitioning evapotranspiration from flood‐irrigated rice fields

Anupoju,

Kambhammettu,

Peddinti

2024

Irrigation and Drainage

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Accurate quantification of evapotranspiration (ET) and its bifurcation into productive transpiration (T) and unproductive evaporation (E) are essential for the successful implementation of sustainable irrigation practices. This study compares the performances of three distinct methods for partitioning ET into E and T fluxes from flood‐irrigated rice fields. These methods include: i) the FAO dual Kc‐ETo model, which utilizes Penman–Monteith (PM) estimates of reference ET and crop‐specific scaling factors; ii) the Priestley‐Taylor (PT) method, which relies on radiation‐driven energy balance at the canopy surface; and iii) the flux variance similarity (FVS) method, which utilizes high‐frequency eddy covariance (EC) measurements of carbon and water vapour fluxes. Meteorological, phenological and hydrological parameters were monitored over two winter seasons in a paddy field, replicating site‐specific management strategies. The cumulative ETs obtained from the PM, PT and FVS methods were 445 mm, 300 mm and 356 mm, respectively, for season 1 and 428 mm, 321 mm and 375 mm, respectively, for season 2. The accuracy of the ET estimation and partition methods was assessed against independent measurements of ET and E using a lysimeter and a microlysimeter. The results demonstrated that the EC‐based FVS method offers superior accuracy in both quantifying (R2 = 0.67, RMSE = 0.70 mm) and partitioning (R2 = 0.51, RMSE = 0.76 mm) ET fluxes, followed by the PM‐based FAO dual Kc‐ETo and PT methods. Evaporation accounted for 29 ± 5% of consumptive water use, highlighting an opportunity for the implementation of water‐saving strategies, particularly during vegetative and transplantation stages. The findings of the path analysis indicate that vegetative and radiation factors influence ET variation, while meteorological and soil factors significantly impact T variation.

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Role of deficit irrigation strategies on ET partition and crop water productivity of rice in semi-arid tropics of south India

Cited by 13 publications

References 50 publications

Creating the ‘Rice Bowl of India’: Examining the political economy of groundwater-led agrarian transformation in dryland India

Creating the ‘Rice Bowl of India’: Examining the political economy of groundwater-led agrarian transformation in dryland India

Practical approaches to enhance water productivity at the farm level in Asia: A review

Comparative analysis of FAO dual Kc, Priestley‐Taylor and flux variance similarity methods in partitioning evapotranspiration from flood‐irrigated rice fields

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