Garuda - Garba Rujukan Digital

Rina Suprihati

Ministry of Agriculture

Author-ID : 2840413

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Economics, Econometrics & Finance

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Buffering capacity of paddy field as the reservoir of rainwater and surface runoff in the Lowokwaru subdistrict, Malang, East Java Rina Suprihati; Nuhfil Hanani; S Gatot Irianto; S Soemarno
Journal of Degraded and Mining Lands Management Vol 5, No 2 (2018)
Publisher : Brawijaya University

Paddy fields produce ecological services that improve environmental quality in urban areas, one of them was flood control through retaining rainwater and surface runoff within the embankment of paddy field. The ability to retain water is known as the buffering capacity (BC), which is the function of soil moisture, embankment height, water inundation and rice-plant interception during the growing periode. The intermitten system of water inundation applied by farmers resulted in changes of the BC on daily basis. The calculation of BC was divided into five categories for accuracy, which were : (1) BC during the Harvest; (2) BC with inundation at vegetative and generative phase (VGG); (3) BC with inundation during Land Preparation and Planting phase (OTTG); (4) BC without inundation during the vegetative and generative phase (VGTG); and (5) BC without inundation during the land preparation and planting phase (OTTTG). The purpose of this research was to measure potential buffering capacity of paddy field in Lowokwaru Subdistrictand to estimate amount of rainwater and surface runoff which could be accommodated within the buffering capacity. The average of daily BC in seven different villages were 1,650.81– 3,961.81 m3/ha and the total BC for 241 paddy field was about 823,156.36 m3.It was only a small percentage of average daily BC filled by rainwater (14.07-33.31%) and left the rest to be filled by surface runoff water. The paddy field of 241 ha in Lowokwaru Subdistrictis was capable to receive surface runoff from surrounding areas up to 1,698.66 ha.

THE ECONOMIC VALUE OF PADDY FIELD BASED ON ITS FACULTIES TO SUPPORT LAND PRODUCTIVITY IN LOWOKWARU SUBDISTRICT, MALANG, EAST JAVA Rina Suprihati
Agricultural Socio-Economics Journal Vol 17, No 3 (2017)
Publisher : Socio-Economics/Agribusiness Department

: Paddy fields commonly possesses intrinsic natural processes and external benefits that support land productivity. Soil fertility which shown by nutrient contents (Nitrogen, phosporous, potassium and organic matters) gives evidence of the existence of natural processes that occur within the soil that will be lost when land conversion happens. Similarly the external benefit of paddy fields as container of domestic waste compost will be lost too due to the land conversion. These functions and benefits are very important but are not appreciated by society. Giving economic values to paddy fields based on these two faculties will inform the society how valuable paddy fields are as natural resources. The economic valuation method used in this reserch is the Replacement Cost Method (RCM) with mathematical formula as follows NELSsFPUH = (UN x Pn + UP x Pp + UK x Pk+ UBO x PBO) x A for economic value of paddy field as provider of nutrients contents (N, P, K) and organic matters; and NELSPK = (WK/KK) x PK x A for economic value of paddy field as compost container. The research was taken place in 6 sub-subdistricts in Lowokwaru Subdistrict with 205 hectares of paddy fields. The economic value of paddy field is about Rp 133,31 billions for economic value of paddy field as provider of nutrients contents (N, P, K) and organic matters; and Rp 7,76 billions for economic value of paddy field as compost container. For both faculties the average economic value Rp 688,18 million per hectare. Paddy fields in Lowokwaru Subdistricts are very feasible to be protected from conversion due to its satisfactory soil fertility and its potential to be increased, thus it is able to maintain land productivity. Therefore, it is very reasonable to call pady fields as productive open green space in which economic and social activities can be developed

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