A Water Productive and Economically Profitable Paddy Rice Production Method to Adapt Water Scarcity in the Vu Gia-Thu Bon River Basin, Vietnam

Nay-Htoon, Bhone; Phong, Nguyen Tung; Schlüter, Sabine; Janaiah, Aldas

doi:10.5027/jnrd.v3i0.05

Cited by 2 publications

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References 7 publications

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“…Moreover, global annual yield increase rates (current rate = 2.4%) of major agricultural crops (especially, rice, maize, wheat, soybean) should be doubled to meet the projected food demand by 2050 [ 56 , 57 ]. Hence, a choice between the trade-off of paddy rice production with high evaporative losses and methane emissions and rainfed rice with increased respiratory losses and possible impact on grain yield [ 58 , 59 ], depends largely on the regional water availability and precipitation regime.…”

Section: Resultsmentioning

confidence: 99%

Quantifying differences in water and carbon cycling between paddy and rainfed rice (Oryza sativa L.) by flux partitioning

et al. 2018

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Agricultural crops play an important role in the global carbon and water cycle. Global climate change scenarios predict enhanced water scarcity and altered precipitation pattern in many parts of the world. Hence, a mechanistic understanding of water fluxes, productivity and water use efficiency of cultivated crops is of major importance, i.e. to adapt management practices. We compared water and carbon fluxes of paddy and rainfed rice by canopy scale gas exchange measurements, crop growth, daily evapotranspiration, transpiration and carbon flux modeling. Throughout a monsoon rice growing season, soil evaporation in paddy rice contributed strongly to evapotranspiration (96.6% to 43.3% from initial growth to fully developed canopy and amounted to 57.9% of total water losses over the growing seasons. Evaporation of rainfed rice was significantly lower (by 65% on average) particularly before canopy closure. Water use efficiency (WUE) was significantly higher in rainfed rice both from an agronomic (WUEagro, i.e. grain yield per evapotranspiration) and ecosystem (WUEeco, i.e. gross primary production per evapotranspiration) perspective. However, our results also show that higher WUE in rainfed rice comes at the expense of higher respiration losses compared to paddy rice (26% higher on average). Hence, suggestions on water management depend on the regional water availability (i.e. Mediterranean vs. Monsoon climate) and the balance between higher respiratory losses versus a potential reduction in CH4 and other greenhouse gas emissions. Our results suggest that a shift from rainfed/unsaturated soil to waterlogged paddy conditions after closure of the rice canopy might be a good compromise towards a sustainable use of water while preserving grain yield, particularly for water-limited production areas.

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Section: Resultsmentioning

confidence: 99%

Quantifying differences in water and carbon cycling between paddy and rainfed rice (Oryza sativa L.) by flux partitioning

et al. 2018

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“…Produktifitas air dari penanaman padi juga perlu ditingkatkan dengan menggunakan pasokan air yang lebih kecil (Africare, Oxfam America, & WWF-ICRISAT Project, 2010). Produktifitas air ini merupakan hasil panen yang ada setiap satuan air yang digunakan (TWU) dengan TWU dapat didekati dengan volume air yang digunakan (Nay-Htoon et al, 2013). Dalam hal ini, SRI mampu meningkatkan produktifitas air di budidaya padi dengan menghemat jumlah air yang digunakan sebesar 25-50% (Uphoff, 2008).…”

Section: Produktivitas Air Dan Lahanunclassified

Muka Air Optimum Pada System Of Rice Intensification (SRI)

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Setiawan

Arif

et al. 2017

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Pengendalian muka air merupakan cara mengelola air di sawah SRI. Petani cenderung mengaplikasikan muka air yang berbeda tergantung pada praktek pengelolaan air setempat. Hal ini dapat berimplikasi pada pertumbuhan tanaman yang dapat terlihat dari jumlah anakan. Pada penelitian ini dilakukan pengamatan pada pembentukan anakan padi SRI di berbagai perlakuan muka air. Muka air dikendalikan menggunakan tabung mariot dengan set-point -12, -7, -5, -3, 0, dan +2 cm dari permukaan tanah. Hasil penelitian menunjukkan nilai kelembaban tanah (Ɵ) berfluktuasi karena adanya penerapan irigasi berselang dan perbedaan muka air. Hal tersebut mempengaruhi jumlah anakan yang terbentuk dimana laju pembentukannya bervariasi antara 0,21-0,29 anakan/hari. Anakan pertama muncul pada 18 hari setelah tanam (HST). Jumlah anakan terus meningkat hingga mencapai nilai maksimal pada 63-72 HST. Studi empirik ini menunjukkan bahwa pengendalian muka air pada -5 cm dari permukaan tanah di budidaya padi SRI merupakan pengelolaan air terbaik dalam produksi anakan dengan produktivitas lahan dan air tertinggi daripada penerapan muka air lainnya. Konsistensi produksi anakan dari awal pembentukan anakan hingga akhir dari musim tanam terlihat pada perlakuan ini.

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A Water Productive and Economically Profitable Paddy Rice Production Method to Adapt Water Scarcity in the Vu Gia-Thu Bon River Basin, Vietnam

Cited by 2 publications

References 7 publications

Quantifying differences in water and carbon cycling between paddy and rainfed rice (Oryza sativa L.) by flux partitioning

Quantifying differences in water and carbon cycling between paddy and rainfed rice (Oryza sativa L.) by flux partitioning

Muka Air Optimum Pada System Of Rice Intensification (SRI)

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