To investigate the acid sulfate soil-adapting strategies of South Kalimantan local rice varieties, their rhizoplane pH was preliminarily examined using a glass-made micro-electrode. Although raw acid-sulfate soils in paddocks in South Kalimantan were generally pH 3.5-4.5 and sometimes pH 2.5, pH values of the rhizoplane of living roots directly measured by the microelectrode always converged to...

Obtaining data on 99Tc in the rice paddy field environment is important because Tc is a redox sensitive element. The behavior of Tc is expected to be different under upland field and rice paddy field conditions since the redox conditions in the soil environment differ. However, most of the data on the nuclide behavior in soil were obtained under upland field conditions. To understand the global...

Aluminium (Al) toxicity is the major factor limiting crop productivity in acid soils. To investigate the molecular mechanisms of Al toxicity and Al tolerance of rice, cDNA-amplified fragment length polymorphism (cDNA-AFLP) was used for identifying Al-regulated genes in roots of an Al-tolerant tropical upland rice, Azucena, and an Al-sensitive lowland rice, IR1552. Nineteen function-known genes ...

The paddy soil-rice system has efficient nutrient replenishing mechanisms. Basic cations and silica are supplied by irrigation water, while biological fixation works as an inexhaustible source of N in the system, and phosphorus availability is enhanced under anaerobic conditions. This, along with almost perfect resistance to soil erosion, gives the paddy rice system high productivity as well as...

Zinc (Zn) biofortification can improve grain yield and nutritional quality in rice, but its effectiveness is subject to agronomic practices other factors. In a previous study, the application of Zn soil enhanced lowland rice well-drained waterlogged soil, whereas upland increased only soil. This new study explores hypothesis that foliar enhance grown under conditions. Two varieties, CNT1 (wetla...

1 This paper compares financial costs and benefits of floating rice-based and intensive rice farming systems using data from focus group discussions and household survey in four locations in the Mekong Delta. We argue that the net financial benefit per 1000m 2 of integrated floating rice-based farming systems is greater than the net financial benefit of intensive rice farming system. The total ...

in this research, allele frequency and polymorphism of 27 microsatellite markers linked to gene loci controlling grain quality were determined between 47 rice varieties from four different groups including 21 iranian local, 16 improved, 7 irri and 3 upland rice varieties. average number of polymorphic information content (pic) and shannon’s diversity index were 0.54 and 1.14, respectively. maxi...

This study examined the impact of improved rice varieties adoption on rice productivity and farming households’ welfare in Nigeria using a cross sectional data of 481 rice farmers drawn from three states to represent the major rice producing ecologies (Irrigated, upland and lowland) in Nigeria. Access to seed was found to be one of the significant determinants of adoption. Poverty incidence was...