Irrigation management transfer (IMT) and system of rice intensification (SRI) practice in the Philippines

Miyazato, Tetsuro; Mohammed, Robert A.; Lazaro, Rogelio C.

doi:10.1007/s10333-009-0188-4

Cited by 19 publications

(7 citation statements)

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“…One of the major WSI practices in China is CI, initially proposed by Li and Peng (1991) and further developed by Peng (1992). During the ricegrowing season, the soil in CI paddy fields remains dry 60-80% of the time, and no standing water is found after the re-greening of rice seedlings, similar to that observed in the water management strategy used in the System of Rice Intensification (Chapagain and Yamaji 2010;Miyazato et al 2010;Sato et al 2011). CI has been proved effective in saving water without causing yield reduction (Yu and Zhang 2002), and has been widely applied in several provinces in China, such as Jiangsu, Ningxia, and Heilongjiang.…”

Section: Introductionmentioning

confidence: 63%

Nitrous oxide emissions from paddy fields under different water managements in southeast China

Peng

Hou

et al. 2011

Paddy Water Environ

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Water management is recognized as one of the most important factors in regulating nitrous oxide (N 2 O) emissions from paddy fields. In China, controlled irrigation (CI) is widely applied because it has been proved highly effective in saving water. During the rice-growing season, the soil in CI paddy fields remains dry 60-80% of the time compared with soil irrigated by traditional methods. This study aims to assess N 2 O emissions from paddy fields under CI, with traditional irrigation (TI) as the control. The cumulative N 2 O emission from CI paddy fields was 2.5 kg N ha -1 , which was significantly greater than that from TI paddy fields (1.0 kg N ha -1 ) (P \ 0.05). Soil drying caused substantial N 2 O emissions. The majority (73.9%) of the cumulative N 2 O emission from CI paddy fields was observed during the drying phase, whereas no substantial N 2 O emissions were observed when the soil was re-wetted after the drying phase. More and significantly higher peaks of N 2 O emissions from CI paddy fields (P \ 0.05) were also detected. These peaks were observed *8 days after fertilizer application at water-filled pore spaces (WFPS) ranging from 78.0 to 83.5%, soil temperature ranging from 29.1 to 29.4°C, and soil redox potential (Eh) values ranging from ?207.5 to ?256.7 mV. The highest N 2 O emission was measured 8 days after the application of base fertilizer at a WFPS of 79.0%, soil temperature of 29.1°C, and soil Eh value of ?207.5 mV. These results suggest that N 2 O emissions may be reduced obviously by keeping the WFPS higher than 83.5% within 10 days after each fertilizer application, especially when the soil temperature is suitable.

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Section: Introductionmentioning

confidence: 63%

Nitrous oxide emissions from paddy fields under different water managements in southeast China

Peng

Hou

et al. 2011

Paddy Water Environ

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“…This change in water management reduced water applications by 40% (Sato and Uphoff 2007). • Philippines: An assessment of irrigation cost savings indicated a 67% reduction with SRI practices, with about 160% less cost for pumping (Miyozato et al 2009). • Afghanistan: Farmers assisted by the Aga Khan Foundation in Baghlan province in the north of the country in 2009 achieved average SRI yields over 9 t ha -1 while using less water under difficult agroclimatic conditions, compared to 5.6 t ha -1 average yield achieved by the same farmers on the same soils (N = 42) (Thomas and Ramzi 2009; see also article in this issue).…”

Section: Introductionmentioning

confidence: 98%

Irrigation water reduction using System of Rice Intensification compared with conventional cultivation methods in Iraq

Hameed¹,

Mosa²,

Jaber³

2011

Paddy Water Environ

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A field study was conducted at Al-Mishkhab Rice Research Station (MRRS) during the summer season 2009 to evaluate irrigation water use efficiency (IWUE) using Anbar 33 variety with the System of Rice Intensification compared to traditional methods. During the growth phase, the number of leaves, stems, and roots, and the average plant height were measured every 15 days for the two sets of methods. At maturity, the depth and length of plant roots was assessed, along with leaf area index (LAI) of the flag leaf and plant height. The amount of irrigation water applied was measured by water meter for both methods. SRI principles for plant age, spacing, etc., were implemented in the SRI plots. The results indicated more vigorous growth of roots under SRI methods, reaching 13,004 cm plant -1 compared with non-SRI results of 4,722 cm plant -1 . There was 42% increase in grain yield when SRI methods were used. These had water use efficiency (WUE) of 0.291 kg m -2 compared with WUE of 0.108 kg m -2 for non-SRI cultivation, almost a threefold difference. SRI practices reduced the need for irrigation water by 38.5%.

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“…Additionally, a few simulated RR were different from the observations (Fig. 2), mainly due to the lack of spatially detailed data on specific fertilization methods, cultivation practices, or rainfall intensity in our models (Liu et al, 2016;Miyazato et al, 2010;Wang et al, 2015a;Xu et al, 2013). Figures 3a and 3b show the annual N runoff or runoff rate from China's rice paddy and upland soils from 1990 to 2012, respectively.…”

Section: Model Performancementioning

confidence: 85%

Detection and attribution of nitrogen runoff trend in China's croplands

Hou

Zhan

Zhou

et al. 2018

Environmental Pollution

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Reliable detection and attribution of changes in nitrogen (N) runoff from croplands are essential for designing efficient, sustainable N management strategies for future. Despite the recognition that excess N runoff poses a risk of aquatic eutrophication, large-scale, spatially detailed N runoff trends and their drivers remain poorly understood in China. Based on data comprising 535 site-years from 100 sites across China's croplands, we developed a data-driven upscaling model and a new simplified attribution approach to detect and attribute N runoff trends during the period of 1990-2012. Our results show that N runoff has increased by 46% for rice paddy fields and 31% for upland areas since 1990. However, we acknowledge that the upscaling model is subject to large uncertainties (20% and 40% as coefficient of variation of N runoff, respectively). At national scale, increased fertilizer application was identified as the most likely driver of the N runoff trend, while decreased irrigation levels offset to some extent the impact of fertilization increases. In southern China, the increasing trend of upland N runoff can be attributed to the growth in N runoff rates. Our results suggested that increased SOM led to the N runoff rate growth for uplands, but led to a decline for rice paddy fields. In combination, these results imply that improving management approaches for both N fertilizer use and irrigation is urgently required for mitigating agricultural N runoff in China.

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Irrigation management transfer (IMT) and system of rice intensification (SRI) practice in the Philippines

Abstract: SRI practices can usually increase the yield of paddy without using special varieties of rice or chemicals.

Cited by 19 publications

References 1 publication

Nitrous oxide emissions from paddy fields under different water managements in southeast China

Nitrous oxide emissions from paddy fields under different water managements in southeast China

Irrigation water reduction using System of Rice Intensification compared with conventional cultivation methods in Iraq

Detection and attribution of nitrogen runoff trend in China's croplands

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