Enhancement of water storage capacity in wetland rice fields through deepwater management practice

Abstract

Paddy field storage of rainfall by bunds is like a rainwater cistern system during the rainy season. Deepwater management practice in paddy fields might be good for rice production and water storage capacity at the same time. The study was conducted in an experiment testing two water management treatments with six rice variety treatments using two lysimeter experiments.The results revealed that deepwater management significantly affected rice production. On the other hand, deepwater management increased the effective rainfall (70 mm) and percolation (225 mm). The runoff coefficient under deepwater management decreased from 0.67 to 0.53. It was reasonable to conclude that the deepwater management provided more water storage capacity during the growing season. Finally, water productivity results point out that even though the volume of input water under deepwater management had increased, deepwater management still can generate higher water productivity.It looks as if it is pointless to save water during the rainy season. On the contrary, if excess water is available in rivers, it should be delivered in timely fashion to the wetland rice fields to increase effective rainfall and the excess saved by maintaining adequate percolation to replenish groundwater, without having to follow strict water conservation measures. Copyright # 2007 John Wiley & Sons, Ltd. RÉ SUMÉ Le stockage des précipitations dans les rizières au moyen de diguettes est analogue à la récupération de l'eau de pluie par citerne. La pratique de la gestion de plan d'eau dans les rizières pourrait être une bonne chose à la fois pour la production de riz et la capacité de stockage de l'eau. L'étude porte sur une expérience combinant deux types de gestion de l'eau, six variétés de riz et deux sortes de lysimètre.Les résultats montrent que la gestion de plan d'eau a affecté de manière significative la production de riz. Par ailleurs elle a augmenté les précipitations efficaces (70 millimètres) et la percolation (225 millimètres). Le coefficient d'écoulement a diminué de 0,67 à 0,53. Il était donc raisonnable de conclure que la gestion de plan d'eau a augmenté la capacité de stockage de l'eau pendant la saison de croissance. Et finalement, les résultats de productivité de l'eau montrent que, en dépit de l'augmentation du volume d'eau entré dans la rizière grâce à la gestion de plan d'eau, cette dernière permet une productivité de l'eau plus élevée.

Transporte de agrotóxicos em lavoura de arroz irrigado sob três manejos de irrigação

“…A altura da lâmina de água nesses dois tratamentos na maior parte do período experimental foi menor que no tratamento com irrigação contínua (Figura 1), ficando assim uma borda livre (diferença entre a altura da lâmina de água e a da taipa), que proporciona o armazenamento de água da chuva no interior da parcela, reduzindo assim o extravasamento. Esses resultados corroboram os estudos realizados por Watanabe et al (2006Watanabe et al ( , 2007, Chang et al (2007) e Phong et al (2008.…”

“…Neste último tipo de perda de água podem estar contidos agrotó-xicos na solução e/ou adsorvidos a coloides do solo em suspensão (Watanabe et al, 2006(Watanabe et al, , 2007Chang et al, 2007;Phong et al, 2008), promovendo maior risco de contaminação ambiental. Trabalhos recentes sobre o monitoramento da qualidade de água identificaram contaminações de fontes superficiais em diferentes regiões orizícolas do Estado do Rio Grande do Sul (Silva et al, 2009): região central (Bortoluzzi et al, 2006Marchezan et al, 2007) e região sul (Grutzmacher et al, 2008).…”

Application of a tank model to assess the flood-control function of a terraced paddy field

“…In this scheme, irrigation water is supplied in appropriate quantities at the ideal time and in the proper order to ensure that all rice paddies receive their minimum water requirements; for example, during 5-to 8-day periods, a total of 6-8 cm water is supplied to the rice paddies only on the first day (Chen and Liu 2002). Chang et al (2007) proposed an irrigation scheme called deepwater management practice for soil and water conservation. Deepwater management practice is applied during the panicle- formation stage, by increasing the maximum water depth to 25 cm.…”

Impact of Water Management on Rice Varieties, Yield, and Water Productivity under the System of Rice Intensification in Southern Taiwan

“…However, Taiwan is plagued with water scarcity problems as fresh water for irrigation is limiting rice production. Rapid urbanization and industrialization along with high irrigation water consumption from the agriculture sector (80%) have been major contributing factors [9]; furthermore, this situation is exacerbated by climate change. In 2014, rice production was compromised as a Madagascar, a comparison over five years found that SRI was labor saving by year four compared to years one to three [32].…”