Field experiments were performed to identify an effective fertilizing scheme for direct-seeding rice (DSR) fields in the Taihu Lake Basin in east China. Based on local traditions, 3 typical fertilizing schemes (FS-1, FS-2, and FS3) were evaluated, in consideration of ensuring a certain rice yield and relatively low nitrogen (N) loss. The base, seedling, tillering, jointing, and panicle fertiliz...

290 T demand for higher crop yields and the relatively low cost of N fertilizer per unit of yield increase has resulted in increased NO3–N concentrations in the groundwater, especially in areas with coarse-textured soils and shallow groundwater. An increased level of NO3–N in the groundwater is not a locally confi ned problem, however, as NO3–N from agricultural sources in the Midwest has been ...

The effects of nitrification inhibitor in tea gardens with different urea–N rates have rarely been assessed. For eight months, a glasshouse experiment was conducted to investigate the (3, 4–dimethylpyrazole phosphate, DMPP) on changes soil pH and inorganic N loss. Urea (0, 300, 500, 800 kg ha−1) or without DMPP (1% applied) were added pots that hosted six plants three years old. Next, leaching ...

Nitrogen (N) cycling was determined in monocultures of Sorghum bicolor (L.) Moench and alley cropped sorghum with Acacia saligna (Labill.) H. Wendl. in semiarid Northern Kenya. N input through biological N2 fixation of the acacia, N transfer from the legume to the intercrop and losses of applied N through harvest and 15 leaching were estimated using N enrichment. The biological N fixation and N...

This study was carried out on saline soils of Sahl El-Houssinia, El-Sharkia Governorate to evaluate three different water sources as a leaching and irrigation water in these soils and their use effect on some trace elements accumulation in the different soil layers. The using water sources were Bahr El-Bakar drain, Bahr Hadoos drain and El-Salam canal. These sources were used in the leaching th...

High N fertilizer and flooding irrigation applied to rice on anthropogenic-alluvial soil often result in N leaching and low recovery of applied fertilizer N from the rice fields in Ningxia irrigation region in the upper reaches of the Yellow River, which threatens ecological environment, food security, and sustainable agricultural development. This paper reported the regulating N application fo...

Measurements of nitrate deposition and streamwater chemistry in the Tillingbourne Catchment, in Southern England, made in 1979-1982 and 1999-2001 show a 216% increase in Nitrogen leaching despite a reduction in N inputs. Both the historical and current data sets have been modelled using the Integrated Nitrogen Model in Catchments (INCA). The process-based model is shown to reproduce the histori...

Nitrogen deposition is projected to increase rapidly in tropical ecosystems, but changes in soil-N-cycling processes in tropical ecosystems under elevated N input are less well understood. We used N-addition experiments to achieve N-enriched conditions in mixed-species, lowland and montane forests in Panama. Our objectives were to (1) assess changes in soil mineral N production (gross rates of ...

For the dehydration process of biomass alcohol using a zeolite NaA (LTA) membrane supported by an alumina porous support tube, it is very important to understand damage of the surface crystal, which may be caused by acetic acid. Therefore, the surface structure and the chemical composition of the LTA membrane that reacted with water or acetic acid (pH 3-4) were investigated by the Fourier Trans...