Dynamics of N-NH4 +, N-NO3 -, and total soil nitrogen in paddy field with azolla and biochar

4th International Conference on Sustainable Agriculture and Environment

农业科学;生态环境科学

Dewi, W.S.^1 ; Wahyuningsih, G.I.^2 ; Syamsiyah, J.^1 ; Mujiyo^1

Lecturer Staff of Agrotechnology, Faculty of Agriculture, Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Surakarta

57126, Indonesia^1

Faculty of Agriculture, Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Surakarta

57126, Indonesia^2

关键词: Absorption efficiency;    Constraint factor;    Different soils;    Organic rice;    Paddy fields;    Root volume;    Soil content;    Soil nitrogen;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/142/1/012014/pdf
DOI  :  10.1088/1755-1315/142/1/012014

来源: IOP

【 摘 要 】

Nitrogen (N) is one of macronutrients which is dynamic in the soil and becomes constraint factor for rice crops. The addition of nitrogen fertilizers and its absorption in paddy field causes the dynamics of nitrogen, thus declines of N absorption efficiency. The aim of this research is to know influence Azolla, biochar and different varieties application on N-NH4+, N-NO3-, and total soil N in paddy field. This research was conducted in a screen house located in Jumantono Laboratory, Faculty of Agriculture, Universitas Sebelas Maret (UNS) with altitude 170 m asl from April to June 2016. Treatment factors that were examined consisted of azolla (0 and 10 tons/ha), biochar (0 and 2 tons/ha), and rice varieties (Cisadane, Memberamo, Ciherang, IR64). The results of this research showed that there was no interaction between azolla, biochar and varieties. Nevertheless, azolla treatment with dose of 10 tons/ha increased soil NH4+content (41 days after planting, DAP) by 13.4% but tend to decrease at 70 and 90 DAP. Biochar treatment with dose of 2 ton/ha increases NO3-soil content (70 DAP) by 1.7% but decreases total N soil by 5.8% (41 DAP) and 4.7% (90 DAP). Different rice varieties generated different soil NH4+content (41 DAP) and rice root volume. Cisadane variety can increase soil NH4+content (41 DAP) by 52.08% and root volume by 51.80% (90 DAP) compared with Ciherang variety. Organic rice field management with azolla and biochar affects the availability of N in the soil and increase N absorption efficiency through its role in increasing rice root volume.