Effects of nitrogen fertilizer application rates on nitrate nitrogen distribution in saline soil in the Hai River Basin, China

Abstract

Conclusions. Nitrogen fertilizer application increased NO 3--N concentration and stock in 0-100cm soil profile and changed NO 3 --N distribution during maize cropping season. And nitrogen fertilizer application promoted movement of NO 3 --N down the soil profile and increased N loss. But effects of nitrogen fertilization application rate on above-ground dry matter production and grain yield were non-linear. Recommendations and Perspectives.A strictly controlled, site-specific, long-term fertilization study will be set up for the determination of biochemical processes of soil NO 3 --N and for the effective N fertilizer management of the saline soil areas. --N) accumulation is related closely to NO 3 -leaching, which is an important issue in groundwater pollution, especially in intensive agricultural areas with saline soils where volumes of water are used in irrigation to avoid salt accumulation in the root zone. However, in the saline environment in Hai River Basin, China, the importance of detailed research into NO 3 --N distribution in the root zone has not been adequately recognized. Considering the impacts of eco-environmental system N and crop production, the present study aimed at contributing to an understanding of the effects of N application rate on soil NO 3 --N distribution, NO 3 --N residue, N loss, and maize (Zea mays L.) yield in this region.

Effects of irrigation and nitrogen application rates on nitrate nitrogen distribution and fertilizer nitrogen loss, wheat yield and nitrogen uptake on a recently reclaimed sandy farmland

“…These include crop N uptake dynamics, N fertilizer management, rainfall, irrigation, soil texture, and N transformations in the soil. N fertilizer and irrigation are two major factors influencing wheat yield, N uptake and N loss, which can be controlled by the grower (Ottman and Pope 2000;Yin et al 2007). N fertilization also increases crop yield when the soil N supply is low (Fredrick and Camberato 1995a, b;Sexton et al 1996).…”

Nitrate leaching from intensive organic farms to groundwater

“…In both greenhouses, the growing season began with an establishment irrigation of 200-240 m 3 ha −1 . In general, establishment irrigation is implemented to prepare the upper soil for the new planting and down-leaching of salts such as sodium chloride that have accumulated in the root zone during the previous season (Yin et al, 2007;Ben-Gal et al, 2008). In addition, in the organic regime, the establishment irrigation enhances the mineralization of nutrients from the compost in the soil for plant uptake.…”

Effects of Salinity on Vegetable Growth and Nutrients Uptake

“…Nitrogen fertilization on saline soils is often necessary because in such soils there is a lack of accessible nitrogen and also because losses of nitrogen due to leaching typical for nitrate form (Yin et al, 2007, Abdelgadir et al, 2010. In addition, rate of nitrification of ammonia is often significantly reduced due to the large direct toxic effects of Cl -and the total amount of salt on the activity of nitrifying bacteria (Stark & Firestone, 1995).…”