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- W2024486487 abstract "In a pot experiment with two typical paddy soils from the province Zhejiang (People's Republic of China) the fixation of NH 4 + by clay minerals after incorporation of farmyard manure (FYM) and the utilization of non-exchangeable NH 4 -N by plants was investigated. The following results were obtained: In the entisol , with vermiculite as the main clay mineral, about 40 % of the soluble NH 4 -N supplied with FYM and 55 % of the NH 4 -N supplied as (NH 4 ) 2 SO 4 were fixed by clay minerals. During the growing season all of the NH 4 + fixed after the fertilizer addition was released. There was a highly significant correlation between the N uptake of the plants and the HCl-extractable NH 4 -N which included exchangeable NH 4 -N as well as the plant-available portion of the non-exchangeable NH 4 -N. However the HCl extraction underestimated the amount of non-exchangeable NH 4 -N which was released during the growing season. In the ultisol , containing mainly kaolinite, the amount of NH 4 + fixed after the addition of FYM and (NH 4 ) 2 SO 4 , respectively, and the amount of non-exchangeable NH 4 -N released during the growing season was negligible. It is concluded that in paddy soils with expandable clay minerals the N efficiency after the application of FYM or ammonium-containing and ammonium-forming fertilizers, respectively, is higher than in soils with mainly 1 : 1 clay minerals. After the penetration of the NH 4 ions into the interlayers, the conversion of ammonium to nitrate is blocked, resulting in lower N losses by denitrification or leaching after flooding. Further N losses by NH 3 volatilization are reduced." @default.
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- W2024486487 date "1992-01-01" @default.
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- W2024486487 title "Fixation and release of ammonium by two typical paddy soils after incorporation of farmyard manure" @default.
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- W2024486487 doi "https://doi.org/10.1016/s1161-0301(14)80059-2" @default.
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